ORCID Profile
0000-0003-0199-0918
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Maritime Engineering | Ocean Engineering | Marine Engineering | Natural Hazards | Geotechnical Engineering | Environmental Engineering | Ocean Engineering | Environmental Engineering Modelling | Physical Oceanography | Groundwater Hydrology | Physical Oceanography
Other | Land and water management | Climate Change Adaptation Measures | Physical and chemical conditions | Natural Hazards in Coastal and Estuarine Environments | Marine Oceanic Processes (excl. climate related) | Integrated (ecosystem) assessment and management |
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2017
Publisher: Elsevier BV
Date: 07-2017
Publisher: American Physical Society (APS)
Date: 06-04-2023
Publisher: Elsevier BV
Date: 04-2023
Publisher: Springer Berlin Heidelberg
Date: 2013
Publisher: Elsevier BV
Date: 03-2016
Publisher: American Society of Mechanical Engineers
Date: 09-06-2013
Abstract: Donghai offshore wind farm, the first and largest commercial operating offshore wind energy system in China, adopted a novel foundation–high-rising structure foundation. In this paper, a three-dimensional porous model, based on Reynolds-Averaged Navier-Stokes equations and Biot’s poro-elastic theory, was developed by integrating 3D wave and seabed models to simulate wave-induced seabed response around the high-rising structure foundation. Then, a parametric study for the wave and seabed characteristics on the foundation stability was conducted. The numerical results concluded from the numerical analysis were as follows: (i) the existence of structure had a significant effect on the wave transformations and the distributions of wave-induced pore pressures (ii) the magnitude of wave-induced pore pressure increased as wave height or wave period increased (iii) the dissipation rate of pore pressure increased as the degree of saturation decreased.
Publisher: American Society of Civil Engineers
Date: 29-03-2012
Publisher: Wiley
Date: 10-04-2009
DOI: 10.1002/NAG.734
Publisher: Bentham Science Publishers Ltd.
Date: 19-07-2017
DOI: 10.2174/1874149501711010552
Abstract: In bioreactor landfills, leachate recirculation significantly influences the process of stabilization and the stability of slope. To speed up the leachate recirculation and reduce its adverse impact on slope stability, this paper proposes a new method which constructs a spatial net consisted of bonded whole tyres in the municipal waste during landfilling. In this study, a numerical two-permeability flow model was used to investigate the effects of tyres embedding on the outflow rate of leachate injection. Furthermore, it was coupled with momentum balance equations to determine the local factor of safety of slope stability. The established model was applied to a simplified bioreactor landfill. The simulation results demonstrated that the tyre net can accelerate the rate of leachate injection and contribute to distribute the liquid more uniformly. Meanwhile, the slope stability was improved due to the enforcement of waste in the presence of tyres.
Publisher: American Society of Mechanical Engineers
Date: 09-06-2013
Abstract: In this paper, a two-dimensional (2D) porous model is established to investigate the predication of the wave-induced pore pressure accumulations in marine sediments. In the new model, the VARANS equation is used as the governing equation for the wave motion, while the Biot’s consolidation theory is used for porous seabed. The present model is verified with the previous experimental data [1] and provides a better prediction of pore pressure accumulation than the previous solution [2]. With the new model, a 2D liquefied zone is formed at the beginning of the process, and then gradually move down. After a certain wave cycle (for ex le, 30 wave cycles in the numerical ex le), the liquefaction zone will become one-dimensional (1D) and continuously move down and eventually approaches to a constant. Numerical results also conclude the maximum liquefaction depth increases as wave height increases and in shallow water.
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 10-2014
Publisher: Elsevier BV
Date: 12-2022
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2014
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2012
Publisher: Elsevier BV
Date: 04-2017
Publisher: MDPI AG
Date: 28-04-2019
DOI: 10.3390/JMSE7050123
Abstract: Principal stress rotation (PSR) is an important feature for describing the stress status of marine sediments subject to cyclic loading. In this study, a one-way coupled numerical model that combines the fluid model (for wave–current interactions) and the soil model (including the effect of PSR) was established. Then, the proposed model was incorporated into the finite element analysis procedure DIANA-SWANDYNE II with PSR effects incorporated and further validated by the experimental data available in the literature. Finally, the impact of PSR on the pore-water pressures and the resultant seabed liquefaction were investigated using the numerical model, and it was found that PSR had a significant influence on the seabed response to combined wave and current loading.
Publisher: Elsevier BV
Date: 04-2018
Publisher: Springer Science and Business Media LLC
Date: 27-08-2011
Publisher: Elsevier BV
Date: 05-2021
Publisher: Springer Science and Business Media LLC
Date: 02-2017
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 10-2014
Publisher: MDPI AG
Date: 27-05-2021
DOI: 10.3390/JMSE9060580
Abstract: Pipelines have been used as one of the main transportation methods for the offshore industry, with increasing activities in marine resources recently. Prediction of seabed instability is one of key factors that must be taken into consideration for an offshore pipeline project. As the first step of the scour process, sediment incipient motion has been intensively studied in the past. Most previous investigations didn’t consider the wave-induced seepage in the elevation of sediment motion. In this paper, two-dimensional seepage was considered to modify the conventional Shields number and its associated impact on sediment incipient motion around the trenched pipeline was investigated. Both flat and sloping seabeds are considered. The numerical results indicated that a peak or valley of the modified Shields number was formed below the pipeline and horizontal seepage flow tremendously impact the sediment motion in the vicinity of the pipeline. Parametric analysis concludes: the influence of the seepage around the pipeline becomes more significant in a large wave, shallow water in a seabed with large shear modulus and permeability, and larger pipeline diameter and smaller flow gap ratio. This will make soil particles be more easily dragged away from the seabed.
Publisher: Elsevier BV
Date: 04-2012
Publisher: American Society of Mechanical Engineers
Date: 08-06-2014
Abstract: In current practice, the most common foundation type for Offshore Wind Turbine generators (OWT’s) at moderate water depths is the monopile. A model pile in scale 1:20 of a typical monopile foundation for offshore wind turbine has undergone lateral vibration testing in dry laboratory sand. Eigen-frequencies are determined based on acceleration measurements. The aim of the tests is to provide benchmark results for validation of different calculation methods for offshore wind monopile foundations. The stiffness contribution from the sand is evaluated on behalf of measuring the first natural frequency of the pile-soil interaction system. Preliminary results from back-calculations of the model tests using both 3D -FEM and a simple beam on elastic foundation model indicate that strain-dependent soil stiffness plays an important role for determining the system stiffness. In this paper, the model tests and their results are presented, along with the preliminary results from the back-calculation.
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 12-2021
Publisher: MDPI AG
Date: 11-01-2021
DOI: 10.3390/JMSE9010066
Abstract: The ocean is the cradle of life and is rich in natural resources [...]
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2014
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 02-2013
Publisher: MDPI AG
Date: 26-05-2020
DOI: 10.3390/S20113009
Abstract: In order to have a better understanding of the real contact area of granular materials, the white light interference method is applied to explore the real surface morphology of clay soils under high stress. Analysis of the surface profile indicates that there exists a support point height z0 with the highest distribution frequency. A concept of a real contact region (from z0 to z0 + d90 d90 represents the particle size corresponding to 90% of the volume fraction) is proposed by combining a surface profile with the particle size distribution of clay soil. It was found that under the compressive stress of 106 MPa–529 MPa, the actual contact area ratio of clay soil varies between 0.375 and 0.431. This demonstrates an increasing trend with the rise of stress. On the contrary, the apparent porosity decreases with an increasing stress, varying between 0.554 and 0.525. In addition, as the compressive stress increases, the cumulative frequency of apparent profile height (from z0 − d90 to z0 + d90) has a concentrated tendency with a limited value of 0.9.
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 2016
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 06-2015
Publisher: MDPI AG
Date: 26-06-2019
DOI: 10.3390/MA12132053
Abstract: Numerous studies have proven that natural particle-packed granular materials, such as soil and rock, are consistent with the grain-size fractal rule. The majority of existing studies have regarded these materials as ideal fractal structures, while few have viewed them as particle-packed materials to study the pore structure. In this study, theoretical analysis, the discrete element method, and digital image processing were used to explore the general rules of the pore structures of grain-size fractal granular materials. The relationship between the porosity and grain-size fractal dimension was determined based on bi-dispersed packing and the geometric packing theory. The pore structure of the grain-size fractal granular material was proven to differ from the ideal fractal structure, such as the Menger sponge. The empirical relationships among the box-counting dimension, lacunarity, succolarity, grain-size fractal dimension, and porosity were provided. A new segmentation method for the pore structure was proposed. Moreover, a general function of the pore size distribution was developed based on the segmentation results, which was verified by the soil-water characteristic curves from the experimental database.
Publisher: Elsevier BV
Date: 12-2022
Publisher: American Society of Mechanical Engineers
Date: 25-06-2017
Abstract: The wave-structure-seabed interaction (WSSI) around circular rubble-mound breakwater head is investigated using a three-dimensional (3D) numerical scheme. The result reveals that the presence of breakwater has strong effect on wave motion and seabed response. The turbulence induced by the breakwater head gives rise to extensive pore pressure around the breakwater head, which could further lead to liquefaction or scour and might eventually result in breakwater failure.
Publisher: Springer Science and Business Media LLC
Date: 10-01-2009
Publisher: Informa UK Limited
Date: 02-07-2016
Publisher: Thomas Telford Ltd.
Date: 02-2014
Abstract: Donghai offshore wind farm next to Shanghai is the first and largest commercial operating offshore wind energy system in China that adopts a high-rising structure foundation. This paper consists of two parts. Details are presented of this wind farm project, site conditions and related engineering solutions in the first part. Then, in the second part, a three-dimensional porous model, based on Reynolds-averaged Navier–Stokes equations and Biot's poro-elastic theory, is developed by integrating three-dimensional wave and seabed models to simulate the wave-induced seabed response around the high-rising structure foundation. A parametric study of the effects of the wave and seabed characteristics on the soil response around the wind turbine foundation is conducted. Results concluded from the numerical analysis are as follows: (a) the existence of the structure has a significant effect on the wave transformation and the distribution of wave-induced pore pressure (b) the magnitude of wave-induced pore pressure increases as wave height or wave period increases. In addition to the current design of the Donghai offshore wind farm with high-rising structure foundation, a gravity-based foundation is also considered and results are compared with those for the high-rising structure foundation.
Publisher: Elsevier BV
Date: 06-2018
Publisher: MDPI AG
Date: 31-03-2023
DOI: 10.3390/JMSE11040762
Abstract: While moving fish farms to offshore sites can be a more sustainable way to expand farmed fish production, the fish pens have to contend with a harsher environment. Thus, it is necessary to draw on offshore engineering competences for designing and analysing the offshore fish farming infrastructure. This paper reviews existing design and analysis guidance from maritime classification and national/international authorities that can be applicable for offshore fish farms. Based on the existing design guidelines, a review of design criteria for offshore fish farms under the following subtopics is provided: design life, design environmental loads, combining environmental loads, and miscellaneous load conditions. This review on the global performance analysis procedures and methods is presented based on practices used for neighbouring industries, such as offshore oil and gas and wind energy production, under the following subtopics: hydrostatic analysis, hydrodynamic analysis, and mooring system analysis with introducing theoretical background and modelling techniques. This paper also highlights limitations and cautions when using these design and analysis methods. Providing this comprehensive information, as well as commentary on their applications, will help engineers and designers to develop offshore fish farming infrastructure with confidence.
Publisher: Elsevier BV
Date: 11-2013
Publisher: Elsevier BV
Date: 03-2013
Publisher: Elsevier BV
Date: 2014
Publisher: Cambridge University Press
Date: 26-04-2018
Publisher: Elsevier BV
Date: 06-2021
Publisher: MDPI AG
Date: 10-12-2020
DOI: 10.3390/JMSE8121011
Abstract: With the rapid development in the exploration of marine resources, coastal geohazard and offshore geotechnics have attracted a great deal of attention from coastal geotechnical engineers and has achieved significant progress in recent years [...]
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 12-2011
Publisher: Springer Science and Business Media LLC
Date: 19-04-2015
Publisher: Elsevier BV
Date: 2013
DOI: 10.1063/2.1301202
Publisher: Elsevier BV
Date: 07-2018
Publisher: Springer Berlin Heidelberg
Date: 2008
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2016
Publisher: Springer Science and Business Media LLC
Date: 12-09-2011
Publisher: Elsevier BV
Date: 05-2011
Publisher: Wiley
Date: 25-04-2011
DOI: 10.1111/J.1745-6584.2011.00820.X
Abstract: The groundwater response of coastal aquifers to tidal forcing is described by Laplace's equation coupled with the nonlinear phreatic-free surface boundary condition. Here we describe fluctuations in the water table using two small parameters, extending previous work by proposing an ansatz to compute higher order, semi-analytical solutions. The new solutions are compared with known lower order solutions. The relative difference between the linear solution and higher order solutions can reach up to 30% of the linear solution for shallow beaches. The new solutions exhibit a reduction in the over height of the groundwater fluctuations compared with the lower order solutions. In addition, the super elevation of the water table, both near shore and as the aquifer tends landward, is examined with the inclusion of higher order terms.
Publisher: Elsevier BV
Date: 02-2013
Publisher: ASME International
Date: 04-08-2014
DOI: 10.1115/1.4027955
Abstract: In this paper, we presented an integrated numerical model for the wave-induced residual liquefaction around a buried offshore pipeline. In the present model, unlike previous investigations, two new features were added in the present model: (i) new definition of the source term for the residual pore pressure generations was proposed and extended from 1D to 2D (ii) preconsolidation due to self-weight of the pipeline was considered. The present model was validated by comparing with the previous experimental data for the cases without a pipeline and with a buried pipeline. Based on the numerical model, first, we examined the effects of seabed, wave and pipeline characteristics on the pore pressure accumulations and residual liquefaction. The numerical results indicated a pipe with a deeper buried depth within the seabed with larger consolidation coefficient and relative density can reduce the risk of liquefaction around a pipeline. Second, we investigated the effects of a trench layer on the wave-induced seabed response. It is found that the geometry of the trench layer (thickness and width), as well as the backfill materials (permeability K and relative density Dr) have significant effect on the development of liquefaction zone around the buried pipeline. Furthermore, under certain conditions, partially backfill the trench layer up to one pipeline diameter is sufficient to protect the pipelines from the wave-induced liquefaction.
Publisher: Elsevier BV
Date: 03-2015
Publisher: ASMEDC
Date: 2008
Abstract: The application of cavity expansion theory in the back estimation of cone penetration tests conducted in calibration chambers has been carried out by many researchers. However, the theory is seldom employed by centrifuge modelers. Based on the work of spherical cavity expansion of previous researchers, this study proposed an analytical solution that incorporates the effects of cone geometry and surface roughness and the effect of compressibility to estimate the cone tip resistance. The calculated results are compared with the measured cone penetration resistance of four cone penetration tests performed in the centrifuge. The cone penetration tests were conducted in granular soil specimens having relative densities ranging between 54% and 89%. The comparison demonstrates the capacity of the cavity expansion theory in the prediction of the centrifuge cone penetration resistance.
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2009
Publisher: ASMEDC
Date: 2010
Abstract: In this paper, a three-dimensional numerical model is developed to analyze the ocean wave-induced seabed response. The pipeline is assumed to be rigid and anchored within a trench. Quasi-static soil consolidation equations are solved with the aid of the proposed Finite Element (FE) model within COMSOL Multiphysics. The influence of wave obliquity on seabed responses, the pore pressure and soil stresses, are studied. A comprehensive tests of FE meshes is performed to determine appropriate meshes for numerical calculations. The present model is verified with the previous analytical solutions without a pipeline and two-dimensional experimental data with a pipeline. Numerical results suggest that the effect of wave obliquity on soil responses can be explained through the following two mechanisms: (i) geometry-based three-dimensional influences, and (ii) the formation of inversion nodes. However, the influences of wave obliquity on the wave-induced pore pressure are insignificant.
Publisher: Elsevier BV
Date: 2013
Publisher: IWA Publishing
Date: 31-10-2014
Abstract: Scour around bridge piers is one of the main causes of bridge failures and is of great importance for hydraulic engineers and scientists. Prediction of the scour depth around piers is complicated, and accurate results are rarely achieved by the existing models. Recently, data mining approaches such as artificial neural networks and fuzzy inference systems have been applied successfully to predict scour depth around hydraulic structures. In this study, an alternative robust data mining approach was used for the predictions of the scour depth around piers, and the results were compared with those of three empirical approaches. Performances of developed models were tested by experimental data sets collected in laboratory experiments and field measurements, together with existing empirical approaches. Statistical measures indicate that the proposed M5′ model provides a better prediction of scour depth than the empirical approaches.
Publisher: Elsevier BV
Date: 05-2011
Publisher: American Society of Civil Engineers (ASCE)
Date: 2008
Publisher: World Scientific Pub Co Pte Ltd
Date: 12-2018
DOI: 10.1142/S2529807018500057
Abstract: A better understanding of soil behavior in a seabed foundation around submerged breakwaters under combined wave and current loadings has become crucial regarding the design and maintenance for such breakwaters. Bragg effect is considered in this study, which is one of the important factors that influence the flow field and soil response in the vicinity of multiple breakwaters. The wave-current induced dynamic soil response (effective stresses, pore pressures and displacements) and its resultant residual liquefaction in a loosely deposited seabed foundation around multiple breakwaters are investigated. In this study, the wave motion is governed by VARANS equation and the Biot’s [Formula: see text]–[Formula: see text] approximation is used to govern soil-fluid interactions in porous medium. The elasto-plastic constitutive model (PZIII) is used to reproduce the plastic soil behavior in seabed foundation under long-term cyclic ocean loading. Numerical results show that the flow motion can be largely changed due to Bragg effects. The construction of breakwaters significantly change the stress field in seabed foundation. Parametric study shows that, under the strongest Bragg effect, the presence of currents, soil properties and wave characteristics have great impact on the liquefaction potential.
Publisher: Springer International Publishing
Date: 2016
Publisher: AIP
Date: 2010
DOI: 10.1063/1.3452112
Publisher: American Society of Mechanical Engineers
Date: 07-2012
Abstract: An integrated model is developed to study the response of a porous seabed to combined wave-current loading. While the Reynolds-Averaged Navier-Stokes (RANS) equations with k-ε turbulence closure scheme and internal wave-maker function are solved for the wave-current interactions, Biot’s poro-elastic “u-p” model is adopted for the seabed response. After validated by the laboratory measurement, this model is applied to investigate the effects of wave, current and soil parameters on the wave-current induced seabed response. Numerical ex les conclude that interacting with the following currents, waves with a shorter period or greater height lead to smaller values of maximum pore pressure.
Publisher: ASME International
Date: 17-02-2009
DOI: 10.1115/1.2827362
Abstract: This paper presents a frequency domain analysis of a circular tunnel with piecewise liners subjected to seismic waves. In our model, the surrounding medium of the tunnel is considered as a linear elastic medium and described by the dynamic elasticity theory, while piecewise liners and connecting joints are treated as curved beams and described by a curved beam theory. Scattered wave field in the surrounding elastic medium are obtained by the wave function expansion approach. The governing equations for vibrations of a curved beam are discretized by the general differential quadrature method. We use domain decomposition methods to establish the global discrete dynamic equations for piecewise liners. Boundary least squares collocation methods, based on the continuity conditions of stresses and displacements between surrounding soil and the piecewise liners, are used to determine the response of the liners and the surrounding medium. Numerical results conclude that the presence of the joints significantly changes the distributions of the tunnel internal force, and dramatically increase shear forces and moment of the tunnel liners around joints.
Publisher: Elsevier BV
Date: 02-2017
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2015
Publisher: Elsevier BV
Date: 06-2008
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2015
Publisher: Elsevier BV
Date: 05-2011
Publisher: Elsevier BV
Date: 10-2012
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 10-2012
Publisher: Elsevier BV
Date: 2008
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 2008
Publisher: Elsevier BV
Date: 10-2013
Publisher: MDPI AG
Date: 17-10-2019
DOI: 10.3390/JMSE7100369
Abstract: Seabed instability surrounding an immersed tunnel is a vital engineering issue regarding the design and maintenance for submarine tunnel projects. In this study, a numerical model based on the local radial basis function collocation method (LRBFCM) is developed to evaluate the seabed behaviour in a marine environment, in which the seabed is treated as the porous medium and governed by Biot’s “ u − p ” approximation. As for the flow field above the seabed, the VARANS equations are used to simulate the fluid motion and properties. The present model is validated with analytical solutions and experimental data which show a good capacity of the integrated model. Both wave and current loading are considered in this study. Parametric studies are carried out to investigate the effects of wave characteristics and soil properties. Based on the numerical results, the maximum liquefaction depth around the immersed tunnel could be deeper under the wave loading with long wave period (T) and large wave height (H). Moreover, a seabed with lower permeability ( K s ) and degree of saturation ( S r ) is more likely to be liquefied.
Publisher: Elsevier BV
Date: 05-2013
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 05-2012
Publisher: WORLD SCIENTIFIC
Date: 19-12-2017
Publisher: MDPI AG
Date: 24-12-2020
DOI: 10.3390/JMSE9010015
Abstract: The evaluation of wave-induced seabed stability around a submerged breakwater is particularly important for coastal engineers involved in design of the foundation of breakwaters. Unlike previous studies, a mesh-free model is developed to investigate the dynamic soil response around a submerged breakwater in this study. Both regular and irregular wave loadings are considered. The present model was validated against the previous experimental data and theoretical models for both regular and irregular waves. Parametric study shows the regular wave-induced liquefaction depth increases as wave period and wave height increase. The seabed is more likely to be liquefied with a low degree of saturation and soil permeability. A similar trend of the effects of wave and seabed characteristics on the irregular wave-induced soil response is found in the numerical ex les.
Publisher: MDPI AG
Date: 21-01-2020
DOI: 10.3390/JMSE8020066
Abstract: In this study, a series of laboratory experiments for the response of wave induced clay-sand seabed were carried out to clarify the mechanism of liquefaction of clayey seabed. The experiments were conducted in an 80 m long wave flume. In the tests, the sand-clay beds were mixed with various clay contents (CC) from 0.5% to 15% and were tested for given wave conditions. The pore water pressure and the water elevation were measured in each test. Soil properties tests and scanning electron microscope (SEM) experiments on different seabed s les were carried out to further explore the mechanism of liquefaction. The experimental results indicated that the litude and accumulation of the excess pore water pressure (EPP) varied with different CC in the sand-clay bed. With the introduction of CC, micro-structure and properties (such as permeability and compressibility) of bed soils changed. Sand-clay bed presented more susceptibility to liquefy compared with pure sand bed. CC promoted seabed liquefaction, even if the added amount was very small (CC is 0.5%), however when CC exceeded a certain value (10% in this study), the mixed bed will not be liquefied. This phenomenon can be well explained by the micro-structure of sand-clay bed. CC within a sandy seabed, does not only affect the permeability, but also change the compressibility of seabed soils. For ex le, the microfabric of seabed vulnerable to liquefaction is loose. Clay aggregations generally gathered at the sand particle contact points. This microfabric is easily compressed under wave loads and allowed pore water to flow, resulting in the accumulation of pore water pressure. On the other hand, the microfabric of seabed that was resistant to liquefaction appeared to be more compact. Due to clay-filled gaps between the sand particles, the pore water is more difficult to flow when seabed was compressed. Furthermore, the tendency of seabed liquefaction is closely related to CC.
Publisher: Springer Science and Business Media LLC
Date: 22-04-2010
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2020
Publisher: American Geophysical Union (AGU)
Date: 05-2013
DOI: 10.1002/WRCR.20237
Publisher: ASME International
Date: 08-2015
DOI: 10.1115/1.4030201
Abstract: In this paper, we presented an integrated numerical model for the wave-induced pore pressures in marine sediments. Two mechanisms of the wave-induced pore pressures were considered. Both elastic components (for oscillatory) and the plastic components (for residual) were integrated to predict the wave-induced excess pore pressures and liquefaction in marine sediments. The proposed two-dimensional (2D) poro-elasto-plastic model can simulate the phenomenon of the pore pressure buildup and dissipation process in a sandy seabed. The proposed model overall agreed well with the previous wave experiments and geo-centrifuge tests. Based on the parametric study, first, we examined the effects of soil and wave characteristics on the pore pressure accumulations and residual liquefaction. Then, a set of analysis on liquefaction potential was presented to show the development of liquefaction zone. Numerical ex le shows that the pattern of progressive waves-induced liquefaction gradually changes from 2D to one-dimensional (1D), while the standing wave-induced liquefaction stays in a 2D pattern in the whole process.
Publisher: Elsevier BV
Date: 2014
Publisher: World Scientific Pub Co Pte Lt
Date: 09-2017
DOI: 10.1142/S021945541750078X
Abstract: A defected periodic viaduct (DPV) is an infinite viaduct consisting of a left and a right semi-infinite ordered periodic viaducts (OPV) and one or several in-between defected spans different from the standard span of the OPV. Currently, no methodology is available in the literature for assessing the dynamic response of a DPV to a moving load, as the presence of the defected spans breaks the periodicity of the OPV. In this study, a new FEM model for estimating the dynamic response of a DPV with one defected span to a moving load is proposed. To establish the model, the time-space domain (TSD) moving load is decomposed into the sum of its constituent frequency wavenumber domain (FWD) load components first. For the DPV subjected to the FWD load component, the response of the left and right semi-infinite OPVs of the DPV can be ided into two parts, namely, the free wave field and the scattered wave field. To determine the free wave field of the left and right semi-infinite OPVs of the DPV, the FEM equations for an in idual span of the viaduct are established and applied to the two OPVs. The scattered wave field in the two semi-infinite OPVs consists of the characteristic waves of the OPV and can be determined using the FEM eigenvalue equations for the OPV free of external loads. Applying the span FEM equations to the defected span and using the expressions for the free wave field and the scattered wave field yield the FWD response of the DPV. The time-space domain response of the DPV can then be retrieved by superposing all the FWD responses of the DPV. Numerical simulations are conducted to investigate the influence of the defected span on the dynamic response of the DPV. For the DPV, there are two kinds of the resonant frequencies, namely, the resonant frequencies common to the corresponding OPV and the additional resonant frequencies due to the presence of the defected span. In some cases, the magnitudes of the responses at the additional resonant frequencies may be larger than those at the common resonance frequencies. Therefore, when conducting the design for a periodic viaduct, it is important to account for the influence of the defected span on the dynamic response of the periodic viaduct.
Publisher: Springer Science and Business Media LLC
Date: 16-10-2017
Publisher: Elsevier BV
Date: 05-2018
Publisher: Springer Science and Business Media LLC
Date: 14-06-2012
Publisher: Informa UK Limited
Date: 21-02-2018
Publisher: MDPI AG
Date: 19-06-2019
DOI: 10.3390/JMSE7060189
Abstract: Cofferdams are frequently used to assist in the construction of offshore structures that are built on a natural non-homogeneous anisotropic seabed. In this study, a three-dimensional (3D) integrated numerical model consisting of a wave submodel and seabed submodel was adopted to investigate the wave–structure–seabed interaction. Reynolds-Averaged Navier–Stokes (RANS) equations were employed to simulate the wave-induced fluid motion and Biot’s poroelastic theory was adopted to control the wave-induced seabed response. The present model was validated with available laboratory experimental data and previous analytical results. The hydrodynamic process and seabed response around the dumbbell cofferdam are discussed in detail, with particular attention paid to the influence of the depth functions of the permeability K i and shear modulus G j . Numerical results indicate that to avoid the misestimation of the liquefaction depth, a steady-state analysis should be carried out prior to the transient seabed response analysis to first determine the equilibrium state caused by seabed consolidation. The depth function G j markedly affects the vertical distribution of the pore pressure and the seabed liquefaction around the dumbbell cofferdam. The depth function K i has a mild effect on the vertical distribution of the pore pressure within a coarse sand seabed, with the influence concentrated in the range defined by 0.1 times the seabed thickness above and below the embedded depth. The depth function K i has little effect on seabed liquefaction. In addition, the traditional assumption that treats the seabed parameters as constants may result in the overestimation of the seabed liquefaction depth and the liquefaction area around the cofferdam will be miscalculated if consolidation is not considered. Moreover, parametric studies reveal that the shear modulus at the seabed surface G z 0 has a significant influence on the vertical distribution of the pore pressure. However, the effect of the permeability at the seabed surface K z 0 on the vertical distribution of the pore pressure is mainly concentrated on the seabed above the embedded depth in front and to the side of the cofferdam. Furthermore, the litude of pore pressure decreases as Poisson’s ratio μ s increases.
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 05-2017
Publisher: Wiley
Date: 13-09-2013
DOI: 10.1002/NAG.2141
Publisher: CRC Press
Date: 21-11-2018
Publisher: ASME International
Date: 28-03-2013
DOI: 10.1115/1.4023203
Abstract: In this paper, a numerical model is developed to study the dynamic response of a porous seabed to combined wave-current loadings. While the Reynolds-averaged Navier–Stokes equations with k-ε turbulence closure scheme and internal wave-maker function are solved for the phenomenon of wave-current interaction, Biot's poro-elastic “u-p” model is adopted for the seabed response. After validated by the laboratory measurements, this model is applied for the investigation of the effects of waves and currents on the wave-current induced pore pressures. Furthermore, the effects of currents on maximum liquefaction depths of a porous seabed is examined, and it is concluded that the opposite currents will increase the liquefaction depth up to 30% of that without currents.
Publisher: Elsevier BV
Date: 03-2021
Publisher: AIP Publishing
Date: 04-2022
DOI: 10.1063/5.0084822
Publisher: Elsevier BV
Date: 09-2017
Publisher: American Geophysical Union (AGU)
Date: 10-2010
DOI: 10.1029/2009WR008746
Publisher: Elsevier BV
Date: 04-2010
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 03-2011
Publisher: American Society of Civil Engineers
Date: 11-07-2015
Publisher: Elsevier BV
Date: 2017
Publisher: MDPI AG
Date: 15-04-2023
DOI: 10.3390/JMSE11040833
Abstract: The evaluation of wave-induced residual pore pressure in a porous seabed and associated seabed liquefaction is essential for designing marine infrastructure foundations. The strength and stiffness of the seabed could be weakened due to the build-up of pore pressures under cyclic wave action, further leading to residual liquefaction. Existing models for residual liquefaction are limited to the quasi-static uncoupled approaches, which do not account for the effect of oscillatory pore pressure on the accumulative pore pressure acceleration of solid particles, despite the mutual influence of these two mechanisms. To overcome these limitations, this paper proposes a new model for residual soil response with u−p approximation (partial dynamic model) that couples oscillatory and residual mechanisms. The proposed model is validated through wave flume tests and centrifuge tests. Based on the coupling model, a new criterion of liquefaction integrating both oscillatory and residual mechanisms is also proposed. Numerical ex les demonstrate that the coupling effect significantly affects the wave-induced seabed liquefaction potential. Furthermore, a new parameter (Ω) representing the ratio of oscillatory and residual pore pressure is introduced to clarify which mechanism dominates the pore pressure development.
Publisher: Elsevier BV
Date: 02-2023
Publisher: MDPI AG
Date: 21-07-2019
DOI: 10.3390/JMSE7070237
Abstract: In this paper, the results of a series of experiments on wave-induced pore-water pressures around a mono-pile are presented. Unlike the previous study, in which the mono-pile was fully buried, the mono-pile in this study was installed at 0.6 m below the seabed surface. In this study, we focus on the pore-water pressures around the mono-pile and beneath the pile. The experimental results lead to the following conclusions: (1) the seabed response is more pronounced near the surface (in the region above 30 cm deep), and the rate of pore pressure attenuation gradually slows down. For the region below 0.3 m, the response is much smaller (2) in general, along the surface of the pile, pore pressures increase as the wave height and wave period increase (3) the spatial distribution of pore pressure near the pile will vary with different wave periods, while the wave height only has a significant effect on the litude and (4) At z = −0.15 m, the pore pressure in front of the pile is the largest, while at the point 0.1 m below the bottom of the pile, the largest pore pressure occurs behind the pile.
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 02-2019
Publisher: Springer Science and Business Media LLC
Date: 10-2010
Publisher: IEEE
Date: 10-2011
Publisher: Bentham Science Publishers Ltd.
Date: 27-12-2013
DOI: 10.2174/1874149520131130009
Abstract: This paper presents a semi-analytical approximation for a two-dimensional (2D) tension analysis of submarine cables during laying operations. In the analysis, based on geometric compatibility relations and equilibrium equations, a set of non-linear differential equations are obtained. The present model considers effects of ocean currents, cable ship motion, pay-out rate, water depth and material properties on submarine cable behavior in water, which are crucial during laying operations. As shown in numerical ex les, with consideration of currents and cable ship motion, the cable tension appears to be smaller and cable configuration curve tends to be fatter than the conventional catenary theory.
Publisher: Elsevier BV
Date: 2019
Publisher: Bentham Science Publishers Ltd.
Date: 02-10-2012
DOI: 10.2174/1874149501206010098
Abstract: Seismic-induced pore pressure and effective stresses in the saturated porous seabed under seismic loading are the main factors that govern the overall stability of submarine pipelines. In most of the previous investigations for the seismic-induced dynamic response around a submarine pipeline have been limited to two-dimension cases. In this paper, a three-dimensional finite element model including buried pipeline is established by extending DYNE3WAC. Based on the numerical model presented, the effects of pipeline geometry and soil characteristics on the seismic-induced pore pressure of the seabed and internal stresses of submarine pipeline will be discussed in detail.
Publisher: Hindawi Limited
Date: 2012
DOI: 10.1155/2012/508754
Abstract: This paper presents a numerical model for the simulation of solitary wave transformation around a permeable submerged breakwater. The wave-structure interaction is obtained by solving the Volume-Averaged Reynolds-Averaged Navier-Stokes governing equations (VARANS) and volume of fluid (VOF) theory. This model is applied to understand the effects of porosity, equivalent mean diameter of porous media, structure height, and structure width on the propagation of a solitary wave in the vicinity of a permeable submerged structure. The results show that solitary wave propagation around a permeable breakwater is essentially different from that around impermeable one. It is also found that the structure porosity has more impact than equivalent mean diameter on the wave transformation and flow structure. After interacting with the higher structure, the wave has smaller wave height behind the structure with a lower travelling speed. When the wave propagates over the breakwater with longer width, the wave travelling speed is obviously reduced with more wave energy dissipated inside porous structure.
Publisher: Elsevier BV
Date: 12-2008
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 2012
Publisher: Elsevier BV
Date: 2017
Publisher: World Scientific Pub Co Pte Ltd
Date: 09-2018
DOI: 10.1142/S2529807018500045
Abstract: To better understand the physical processes involved in the wave–seabed–pipeline interactions (WSPI), a three-dimensional numerical model for the wave-induced soil response around an offshore pipeline is proposed in this paper. Seabed instability around an offshore pipeline is one of the key factors that need to be considered by coastal engineers in the design of offshore infrastructures. Most previous investigations into the problem of WSPI have only considered wave conditions and have not included currents, despite the co-existence of waves and currents in natural ocean environments. Unlike previous studies, currents are included in the present study for the numerical modeling of WSPI, using an integrated FVM model, in which the volume-averaged Reynolds-averaged Navier–Stokes (VARANS) equation is used to solve the mean fluid field, while Biot’s consolidation equation is used to describe the solid–pore fluid interaction in the porous medium. Numerical ex les demonstrate a significant influence of ocean current direction and angle on the wave-induced pore pressures and the resultant seabed liquefaction around the pipeline, which cannot be observed in two-dimensional (2D) numerical simulation.
Publisher: Elsevier BV
Date: 07-2019
Publisher: American Society of Mechanical Engineers
Date: 07-2012
Abstract: In this paper, an analytical solution for the response of a porous seabed to combined wave and current loadings is presented. Unlike most previous investigations, currents are considered in this study. Based on the newly analytical solution, a detailed parametric study will be carried out to explore the effects of combined wave and current loading and inertial terms on the pore pressure in marine sediments. Numerical ex les demonstrate the significant effects of currents and inertial terms on the pore pressures in shallow water. The relative difference of the maximum pore pressures between the present model and the previous model (without currents) can reach 7% of the static water pressure.
Publisher: Copernicus GmbH
Date: 13-05-2011
DOI: 10.5194/HESS-15-1473-2011
Abstract: Abstract. The groundwater fluctuations due to tidal variations at an observation well in a coastal aquifer can be used to determine the tidal characteristics and aquifer parameters without conducting an aquifer test. In this study, a method, comprised of Jeng et al.'s solution (2005) and simulated annealing (SA) algorithm, is developed to determine the coastal aquifer parameters (hydraulic diffusivity, beach slope, and aquifer thickness) as well as the tidal characteristics (bichromatic-tide litudes, bichromatic-tide wave frequencies, and tidal phase lag) from the analysis of the tide-induced well-water-level (WWL) data. The synthetic WWL data generated from Jeng et al.'s solution (2005) with assumed parameter values and field data obtained from Barrenjoey beach, Australia, are analyzed. The estimated parameter values obtained from analyzing synthetic WWL data by the present method show good agreements with the previously assumed parameter values. The parameter estimation procedure may however fail in the case of a large shallow water parameter which in fact violates the constraint on the use of Jeng et al.'s solution (2005). In the analysis of field WWL data, the results indicate that the aquifer parameters estimated from the present method with single or multiple well data are significantly different from those given in Nielsen (1990). Inspecting the observed WWL data and the WWL data predicted from Jeng et al.'s solution (2005) reveals that the present method may provide better estimations for the aquifer parameters than those given in Nielsen (1990).
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 09-2022
Publisher: Springer Science and Business Media LLC
Date: 27-04-2019
Publisher: Elsevier BV
Date: 07-2009
Publisher: CRC Press
Date: 31-10-2012
DOI: 10.1201/B13165
Publisher: Thomas Telford Ltd.
Date: 09-2018
Abstract: The flow regime around a hexagonal polygon with low Reynolds numbers Re 200 is numerically investigated in two different orientations namely face- and corner oriented. The basic flow characteristics, including drag coefficient, lift coefficient, Strouhal number and critical Reynolds number of the hexagonal cylinders, are calculated by solving the Navier–Stokes and mass conservation (continuity) equations, using the Simple (semi-implicit method for pressure-linked equations) algorithm. Within the studied range of Re, the predicted lift coefficient and Strouhal number of the face-oriented hexagon were higher than those of the corner-oriented hexagon. In contrast, the predicted drag coefficient and critical Reynolds number of the corner-oriented hexagon were greater than those of the face-oriented one. Flow characteristics of a novel textured geometry are also studied using three-dimensional transient analysis. The Strouhal number St of the textured geometry was found to be in between the St of both the hexagonal cylinders, and its lift coefficient is lower than that of the hexagonal cylinders. The computational fluid dynamics results show that, within the studied Reynolds number range, the drag coefficient of the textured pipe is almost equal to that of the circular cylinder while its lift coefficient is substantially smaller than that of circular and face- and corner-oriented hexagon pipes.
Publisher: Elsevier BV
Date: 10-2011
Publisher: Informa UK Limited
Date: 29-06-2017
Publisher: Elsevier BV
Date: 2016
Publisher: AIP Publishing
Date: 2022
DOI: 10.1063/5.0076659
Abstract: In this paper, a new semi-analytical solution is proposed to describe the interactions between ocean waves and a flexible cylindrical net cage that is submerged at different depths below the mean water level. The flexible net is treated as a thin perforated shell, and its deformation is governed by the membrane vibration equation of cylindrical shells. The small- litude wave theory is adopted to simulate the wavefield, while the flow passing through the cage is described by the porous medium theory. The numerical results exhibit significant wave responses of the net cage, including the distribution properties of wave surfaces, dynamic pressure drops on the net interface, and net structure displacements. Furthermore, the influences of several important design parameters on the hydrodynamic action imposed on the net cage are revealed by parametric studies. The present studies conclude that the significant wave impact is mainly concentrated on the free water surface, and increasing the porosity and flexibility of the net can alleviate wave scattering and the hydrodynamic actions. In addition, at specific wave frequencies, the horizontal wave force acting on the cage will vanish. These findings should be useful to engineers who are designing offshore fish cage systems.
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 2023
Publisher: MDPI AG
Date: 16-12-2021
DOI: 10.3390/JMSE9121445
Abstract: In the present study, a semi-analytical model based on the small- litude wave theory is developed to describe the wave fields around a single gravity-type cylindrical open fish net cage. The cage may be submerged to different depths below the free-water surface. The fish cage net is modelled as a flexible porous membrane, and the deflection of the net chamber is expressed by the transverse vibration equation of strings. The velocity potential is expanded in the form of the Fourier–Bessel series and the unknown coefficients in these series are determined from matching the boundary conditions and the least squares method. The number of terms for the series solution to be used is determined from convergence studies. The model results exhibit significant hydroelastic characteristics of the net cages, including the distribution properties of wave surface, pressure drop at the net interface, structural deflection, and wave loading along the cage height. In addition, the relationships between wave forces on the net cage with hydrodynamic and structural parameters are also revealed. The findings presented herein should be useful to engineers who are designing fish cage systems.
Publisher: Elsevier BV
Date: 10-2017
Publisher: Springer Science and Business Media LLC
Date: 20-08-2015
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 11-2013
Publisher: AIP
Date: 2012
DOI: 10.1063/1.4756442
Publisher: AIP
Date: 2012
DOI: 10.1063/1.4756441
Publisher: Elsevier BV
Date: 06-2018
Publisher: Coastal Education and Research Foundation
Date: 09-2016
Publisher: Elsevier BV
Date: 09-2013
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2008
Publisher: Elsevier BV
Date: 02-2009
Publisher: Springer Science and Business Media LLC
Date: 14-10-2009
Publisher: Elsevier BV
Date: 02-2013
Publisher: Oxford University Press (OUP)
Date: 23-11-2011
DOI: 10.1093/AOB/MCR296
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 09-2015
Publisher: MDPI AG
Date: 05-07-2023
DOI: 10.3390/JMSE11071372
Abstract: Although twin pipelines in series have been used to transport hydrocarbons in engineering practice, most previous studies focused on the dynamic response of the seabed around a single pipeline. A two-way coupling model of fluid–structure–seabed interaction (FSSI) is proposed for the study of the soil response and liquefaction caused by waves and currents around twin pipelines. The present model integrates the flow model and the seabed model by introducing a boundary condition of velocity continuity in addition to the continuity of pressures at the seabed surface. Then, the inconsistency between the physical process and numerical simulation can be overcome in the one-way coupling model. Through a series of numerical simulations, the influence of different flow characteristics, soil properties, and pipeline configurations on the seabed response under the two-way coupling process were explored, and compared with the results of the single pipeline. The numerical results indicate that the twin pipeline configuration significantly alters the relevant responses compared to the single pipeline configuration, including the after-consolidation state, litude of velocity at the seabed surface, and distribution of pore pressure in the seabed. The parametric studies show that the litudes of the wave and current have significant impacts on the distribution of pore pressure in the seabed. The pore pressure in the seabed increases with the increase of forward wave current, while the results of reverse wave current are the opposite. In addition, the liquefaction range around the pipeline increases with the increase of Hw and Tw, and increases with the decrease of Sr and ks. At the same time, the gaps (G) and the ratio of pipe radius (R1/R2) between the twin pipelines also significantly affect the seabed response and liquefaction distribution around the pipeline.
Publisher: ASMEDC
Date: 2008
Abstract: In this study, a coupled model is proposed to investigate dynamic response of a porous seabed and an offshore pile to ocean wave loadings. Both the offshore pile and the porous seabed are treated as a saturated poro-elastic medium, while the seawater is considered as a conventional acoustic medium. The coupled boundary element model is established by the continuity conditions along the interfaces between the three media. In the system, wave force is considered as an external load and it is evaluated via the wave function expansion method in the context of a linear wave theory. Numerical results show that the increase of the modulus ratio between the pile and the seabed can reduce the horizontal displacement of the pile and the pore pressures of the seabed around the pile. Furthermore, the maximum pore pressure of the seabed usually occurs at the upper part of the seabed around the pile.
Publisher: Elsevier BV
Date: 04-2018
Publisher: ASMEDC
Date: 2009
Abstract: In this paper, a poro-elastoplastic model (PORO-WSSI II) is proposed to prediction of wave-induced liquefaction around breakwater heads. Existing models for the wave-induced seabed response around breakwater heads have been limited to poro-elastic soil behaviour and de-coupled oscillatory and residual mechanisms for the rise in excess pore water pressure. The proposed model was reduced to special cases and verified with existing 2D experimental data available and 3D analytical solution in front of a breakwater. With the proposed new model, a parametric study is conducted to investigate the relative differences of the predictions of the wave-induced pore pressure and liquefaction with poro-elastic and poro-elasto-plastic models. With the new model, we further investigate the wave-induced liquefaction in a layered seabed around breakwater heads.
Publisher: Elsevier BV
Date: 07-2013
Publisher: Elsevier BV
Date: 07-2022
Publisher: Coastal Education and Research Foundation
Date: 02-09-2015
Publisher: Elsevier BV
Date: 11-2013
Publisher: Elsevier BV
Date: 03-2008
Publisher: Elsevier BV
Date: 2013
Publisher: American Society of Mechanical Engineers
Date: 08-06-2014
Abstract: In this study, a two-dimensional poro-elasto-plastic model for the wave-induced liquefaction in a porous seabed was presented. Two mechanisms of the wave-induced pore pressures were considered. Both elastic components (for oscillatory) and the plastic components (for residual) were integrated to predict the wave-induced excess pore pressures in marine sediments. The proposed 2D poro-elasto-plastic model allows for the pore pressure build-up process in a sandy seabed. The proposed model overall agreed well with the previous wave experiments and centrifuge tests. Numerical ex le shows that the pattern of progressive waves -induced liquefaction gradually changed from 2D to 1D.
Publisher: Elsevier BV
Date: 07-2014
Publisher: MDPI AG
Date: 07-09-2021
DOI: 10.3390/JMSE9090972
Abstract: The phenomenon of soil–structure interactions in marine environments has attracted much attention from coastal and geotechnical engineers and researchers in recent years [...]
Publisher: MDPI AG
Date: 23-03-2022
DOI: 10.3390/GEOSCIENCES12040145
Abstract: The study of soil–structure interface behavior contributes to the fundamental understanding of engineering performance and foundation design optimization. Previous research studies the effect of soil characteristics and surface roughness property on the soil–material interface mechanism via interface shear test. The reviews utilizing past established laboratory studies and more recent tests based on state-of-the-art technologies reveal that surface roughness significantly affects interface shear performances in the studies of soil–structure interactions, especially in peak shear strength development. A preliminary but original investigative study by the authors was also carried out using a sophisticated portable surface roughness gauge to define the material surface roughness properties in order to study the interface behavior parametrically. Additionally, using the authors’ own original research findings as a proof-of-concept innovation, particle image velocimetry (PIV) technology is applied using a digital single-lens reflex (DSLR) camera to capture sequential images of particle interactions in a custom-built transparent shear box, which validate the well-established four-stage soil shearing model. The authors also envisaged that machine learning, e.g., artificial neural network (ANN) and Bayesian inference method, amongst others, as well as numerical modeling, e.g., discrete element method (DEM), have the potential to also promote research advances on interface shear mechanisms, which will assist in developing a greater understanding in the complex study of soil–structure interactions.
Publisher: Informa UK Limited
Date: 29-04-2016
Publisher: Elsevier BV
Date: 06-2015
Publisher: Elsevier BV
Date: 11-2013
Publisher: MDPI AG
Date: 18-09-2020
DOI: 10.3390/S20185348
Abstract: The offshore wind energy (OWE) pile foundation is mainly a large diameter open-ended single pile in shallow water, which has to bear long-term horizontal cyclic loads such as wind and waves during OWE project lifetime. Under the complex cyclic loads, the stress and displacement fields of the pile-soil system change continuously, which affects the dynamic characteristics of the pile foundation. Within the service life of the pile foundation, the pile-soil system has irreversible cumulative deformation, which further causes damage to the whole structure. Therefore, it is important to examine the overall dynamic characteristics of wind power foundation under high cycle. In this paper, in the dry sand foundation, taking the Burbo Bank 3.6 MW offshore turbine-foundation structure as the prototype, the horizontal cyclic loading model tests of the wind power pile foundation with the scale of 1:50 were carried out. Considering the factors such as loading frequency and cyclic load ratio, the horizontal dynamic characteristics of the whole OWE pile foundation are studied. The comparison results between the maximum bending moment of pile and the fitting formula are discussed. In conclusion, moment of OWE pile shaft is corresponding to the loading frequency (f = 9 HZ) and loading cycles by fitting formulas. The fatigue damage of the OWE pile does not occurs with low frequencies in high cycles.
Publisher: Coastal Education and Research Foundation
Date: 11-2015
Publisher: Elsevier BV
Date: 08-2011
Publisher: Informa UK Limited
Date: 03-03-2018
Publisher: Springer Science and Business Media LLC
Date: 14-10-2012
Publisher: Elsevier BV
Date: 12-2017
Publisher: Coastal Education and Research Foundation
Date: 25-02-2014
Publisher: Copernicus GmbH
Date: 26-07-2010
DOI: 10.5194/HESS-14-1341-2010
Abstract: Abstract. In this study, a new analytical solution for describing the tide-induced groundwater fluctuations in oceanic islands with finite length and different slopes of the beaches is developed. Unlike previous solutions, the present solution is not only applicable for a semi-infinite coastal aquifer, but also for an oceanic island with finite length and different sloping beaches. The solution can be used to investigate the effect of higher-order components and beach slopes on the water table fluctuations. The results demonstrate the effect of higher-order components increases with the shallow water parameter or litude parameter and the water table level increases as beach slopes decrease.
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 03-2008
Publisher: MDPI AG
Date: 28-03-2019
DOI: 10.3390/JMSE7040087
Abstract: The evaluation of the wave-induced seabed instability around a submarine pipeline is particularly important for coastal engineers involved in the design of pipelines protection. Unlike previous studies, a meshfree model is developed to investigate the wave-induced soil response in the vicinity of a submarine pipeline. In the present model, Reynolds-Averaged Navier-Stokes (RANS) equations are employed to simulate the wave loading, while Biot’s consolidation equations are adopted to investigate the wave-induced soil response. Momentary liquefaction around an offshore pipeline in a trench is examined. Validation of the present seabed model was conducted by comparing with the analytical solution, experimental data, and numerical models available in the literature, which demonstrates the capacity of the present model. Based on the newly proposed model, a parametric study is carried out to investigate the influence of soil properties and wave characteristics for the soil response around the pipeline. The numerical results conclude that the liquefaction depth at the bottom of the pipeline increases with increasing water period (T) and wave height (H), but decreases as backfilled depth ( H b ), degree of saturation ( S r ) and soil permeability (K) increase.
Publisher: Springer Science and Business Media LLC
Date: 10-10-2014
Publisher: Elsevier BV
Date: 2018
Publisher: MDPI AG
Date: 14-09-2023
DOI: 10.3390/JMSE11091795
Publisher: Springer Science and Business Media LLC
Date: 04-2018
Publisher: Elsevier BV
Date: 03-2015
Start Date: 2002
End Date: 12-2004
Amount: $20,724.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2003
End Date: 12-2006
Amount: $287,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2008
End Date: 12-2010
Amount: $59,828.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2008
End Date: 12-2010
Amount: $67,984.00
Funder: Australian Research Council
View Funded ActivityStart Date: 08-2006
End Date: 12-2007
Amount: $22,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2004
End Date: 06-2007
Amount: $53,800.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2008
End Date: 11-2008
Amount: $330,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2009
End Date: 12-2013
Amount: $290,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2002
End Date: 12-2005
Amount: $10,100.00
Funder: Australian Research Council
View Funded ActivityStart Date: 08-2004
End Date: 12-2007
Amount: $365,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 05-2017
End Date: 05-2018
Amount: $600,000.00
Funder: Australian Research Council
View Funded Activity