ORCID Profile
0000-0003-4176-5379
Current Organisation
University of Adelaide
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Research Topics
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.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Civil Geotechnical Engineering | Geomechanics and Resources Geotechnical Engineering | Resources Engineering and Extractive Metallurgy | Mining Engineering | Civil Engineering | Construction Engineering | Construction Materials | Composite and Hybrid Materials |
ANZSRC Socio-Economic Objective (SEO)
Mining and Extraction of Copper Ores | Civil Construction Processes | Coal Mining and Extraction | Metals (e.g. Composites, Coatings, Bonding) | Civil Construction Design | Construction Materials Performance and Processes not elsewhere classified | Mining and Extraction of Iron Ores | Primary Mining and Extraction of Mineral Resources not elsewhere classified
Related Links
Publications
Deterioration and strain energy development of sandstones under quasi-static and dynamic loading after freeze-thaw cycles
Publisher: Elsevier BV
Date: 04-2019
Drilling Penetration Rate Estimation using Rock Drillability Characterization Index
Publisher: Springer Science and Business Media LLC
Date: 13-01-2016
A cohesive grain based model to simulate shear behaviour of rock joints with asperity damage in polycrystalline rock
Publisher: Elsevier BV
Date: 2020
Rock cutting performance assessment using strain energy characteristics of rocks
Publisher: Informa UK Limited
Date: 28-03-2017
The Effect of Curing under Applied Stress on the Mechanical Performance of Cement Paste Backfill
Publisher: MDPI AG
Date: 09-10-2021
DOI: 10.3390/MIN11101107
Abstract: After placing the Cement Paste Backfill (CPB) slurry in mined cavities underground, during the setting and hardening processes, the weight and hydrostatic pressure of the upper-layer CPB slurry applies an axial load over the bottom-layer CPB materials, which is called the self-consolidation of CPB slurry. Due to this phenomenon, the mechanical properties of in situ CPB could be considerably different from laboratory results. Hence, it is crucial to understand the effect of self-consolidation behaviour on the mechanical properties of backfill material. This paper presents an experimental study on the impact of axial applied stress (As) during curing, which represents the various self-consolidation conditions and curing times on the mechanical properties of CPB material prepared using the tailings of a copper mine in South Australia and a newly released commercially manufactured cement called Minecem (MC). A curing under pressure apparatus (CPA) is designed to cure CPB s les under axial applied stress. The equipment can apply and measure axial load during curing and measure the passive lateral stress due to axial load which represents the horizontal stresses at a certain depth of CPB stope on the retaining structure. The prepared s les with axially applied pressure during curing were tested under uniaxial and triaxial compressive loading conditions. Microstructural tests by scanning electron microscopy (SEM) were also used to study the fabric evolution in response to various applied stresses during curing. Overall, the increase in As during curing leads to higher resultant CPB peak strength and stiffness under uniaxial and triaxial compression tests. For instance, a s le cured under 3.6 MPa axial load for 28 days demonstrates a uniaxial compressive strength (UCS) value of five times more than a s le cured under atmospheric curing conditions. Passive lateral stress was measured during the curing period and was representative of underground barricade stress. Furthermore, during curing, the axial applied stress changed the initial CPB pore structure after placement. With the increase in applied stress, the stress compressed CPB s les at the macroscale, leading to much smaller pores or cracks prior to the hydration process. At an early stage, the increase in UCS due to axial applied stress mainly arises from a dense microstructure caused by the compression of tailings and cement particles. With the increase in curing time, the observation also shows that a CPB matrix with fewer pore spaces may improve the hydration progress hence, the influence of axial applied stress becomes more pronounced in long-term UCS.
Development of an apparatus for down-hole triaxial tests in a rock mass
Publisher: Elsevier BV
Date: 07-2008
A sulphonated oil for stabilisation of expansive soils
Publisher: Informa UK Limited
Date: 04-12-2017
Expansion Properties of Cemented Foam Backfill Utilizing Coal Gangue and Fly Ash
Publisher: MDPI AG
Date: 15-06-2022
DOI: 10.3390/MIN12060763
Abstract: The cemented backfill (CB) utilizing coal gangue (CG) and fly ash (FA) is widely applied in coal mines. However, the bleeding and shrinkage of CB leads to insufficient contact with surrounding rock, which is not beneficial for controlling roof subsidence and even stope stability. Herein, a cemented foam backfill (CFB) formulation is demonstrated, employing hydrogen dioxide (H2O2) as a chemical foaming agent. The cement and FA show noticeable inhibiting effects on volume expansion due to the network formed by their hydrates. Moderately lower cement, FA, and solid concentration are beneficial to improve volume increment and prolong expanding duration. A foaming coefficient (k) is proposed in theory to evaluate the foaming efficiency. The kem values, determined by volume evolution experiments of CFB slurries, provide a calculation basis for the needed dosage of H2O2 solution targeting specific volume increment. CFB specimens with expanding ratios of 21%~103% and densities of 994~592 kg/cm3 were prepared, with an actual foaming coefficient of 52.40 cm3/g and uniaxial compressive strength (UCS) of 0.32~0.55 MPa. The mass of H2O2 solution was 1.9%~11.3% of cement and 0.29%~1.67% of total solid materials by weight. The UCS decline compared to CB was attributed to rich pores observed by CT and carbonation indicated by X-ray diffraction (XRD).
Distinct element geomechanical modelling of the formation of sinkhole clusters within large-scale karstic depressions
Publisher: Copernicus GmbH
Date: 29-07-2019
Abstract: Abstract. The 2-D distinct element method (DEM) code (PFC2D_V5) is used here to simulate the evolution of subsidence-related karst landforms, such as single and clustered sinkholes, and associated larger-scale depressions. Subsurface material in the DEM model is removed progressively to produce an array of cavities this simulates a network of subsurface groundwater conduits growing by chemical/mechanical erosion. The growth of the cavity array is coupled mechanically to the gravitationally loaded surroundings, such that cavities can grow also in part by material failure at their margins, which in the limit can produce in idual collapse sinkholes. Two end-member growth scenarios of the cavity array and their impact on surface subsidence were examined in the models: (1) cavity growth at the same depth level and growth rate (2) cavity growth at progressively deepening levels with varying growth rates. These growth scenarios are characterised by differing stress patterns across the cavity array and its overburden, which are in turn an important factor for the formation of sinkholes and uvala-like depressions. For growth scenario (1), a stable compression arch is established around the entire cavity array, hindering sinkhole collapse into in idual cavities and favouring block-wise, relatively even subsidence across the whole cavity array. In contrast, for growth scenario (2), the stress system is more heterogeneous, such that local stress concentrations exist around in idual cavities, leading to stress interactions and local wall/overburden fractures. Consequently, sinkhole collapses occur in in idual cavities, which results in uneven, differential subsidence within a larger-scale depression. Depending on material properties of the cavity-hosting material and the overburden, the larger-scale depression forms either by sinkhole coalescence or by widespread subsidence linked geometrically to the entire cavity array. The results from models with growth scenario (2) are in close agreement with surface morphological and subsurface geophysical observations from an evaporite karst area on the eastern shore of the Dead Sea.
Local Damage and Progressive Localisation in Porous Sandstone During Cyclic Loading
Publisher: Springer Science and Business Media LLC
Date: 21-08-2017
Performance of rock crack stress thresholds determination criteria and investigating strength and confining pressure effects
Publisher: Elsevier BV
Date: 05-2020
An innovative method for placement of gangue backfilling material in steep underground coal mines
Publisher: MDPI AG
Date: 13-02-2019
DOI: 10.3390/MIN9020107
Abstract: Using gangue backfilling in underground coal mining not only controls the roof deformation in the gob area but also reduces the amount of mining waste rock. However, due to the limitations of the complicated engineering conditions, backfilling mining in the steep coal seam is not widely applied. In this study, a long-distance backfilling technology with a scraper winch for a steep coal seam was proposed and applied in a flexible shield supporting working face in Datai Mine, Beijing. Aiming at the problem of the decreasing backfilling ratio in field practice, numerical simulation was carried out to research the moving law of gangue in the goaf. The gangue mainly experienced four stages: gangue landslide stage, small-scale subsidence stage, funnel-shaped subsidence stage, and large-scale subsidence stage. The moving area of the gangue could be ided into five areas including a motionless area, a landslide area, a subsidence area, a funnel-shaped subsidence area, and a to-be-backfilled area. With the increase of the inclined length of the working face, the moving time of the gangue increased gradually. Based on the simulation results, the scheme of backfilling and mining in Datai Mine was optimized, for which the inclined length of the working face was shortened, and a higher backfilling ratio was obtained.
A Modified Coal Mine Roof Rating Classification System to Design Support Requirements in Coal Mines
Publisher: Springer Science and Business Media LLC
Date: 03-01-2017
Study on effect of in-situ stress ratio and discontinuities orientation on borehole stability in heavily fractured rocks using discrete element method
Publisher: Elsevier BV
Date: 03-2016
Distinct Element geomechanical modelling of the formation of sinkhole cluster within large-scale karstic depressions
Publisher: Copernicus GmbH
Date: 29-01-2019
DOI: 10.5194/SE-2019-20
Abstract: Abstract. The 2D Distinct Element Method (DEM) code (PFC2D_V5) is here used to simulate the evolution of subsidence-related karst landforms, such as single and clustered sinkholes, and associated larger-scale depressions. Subsurface material in the DEM model is removed by a feedback loop to produce an array of cavities this simulates a network of subsurface groundwater conduits growing by chemical/mechanical erosion. The growth of the cavity array is coupled mechanically to the surroundings such that cavities can grow also in part by material failure at their margins, which in the limit can produce in idual collapse sinkholes. Two end-member growth scenarios of the cavity array and their impact on surface subsidence were examined in the models: (1) cavity growth at the same level and at the same in idual growth rate (2) cavity growth at progressively deepening levels with varying in idual growth rates. These growth scenarios are characterised by differing stress patterns across the cavity array and its overburden, which are in turn an important factor for the formation of sinkholes and uvala-like depressions. For growth scenario (1), a stable compression arch is established around the cavity array, hindering sinkhole collapse into in idual cavities and favouring block-wise subsidence across the whole cavity array. In contrast, for growth scenario (2), the stress system is more heterogeneous, such that local stress concentrations exist around in idual cavities leading to stress interaction. Consequently, sinkhole collapses into in idual cavities occurs by shear or tensile failure of the overburden, and these sinkholes lie within a larger scale depression linked to the cavity array as a whole. The results from models with growth scenario (2), which also account for variations in mechanical properties of the overburden, are in close agreement with surface morphological and subsurface geophysical observations from a karst area on the eastern shore of the Dead Sea.
Assessment of the Stability of Rock Slopes by the Slope Stability Rating Classification System
Publisher: Springer Science and Business Media LLC
Date: 05-05-2009
Improved Geotechnical Behavior of an Expansive Soil Amended with Tire-Derived Aggregates Having Different Gradations
Publisher: MDPI AG
Date: 19-10-2020
DOI: 10.3390/MIN10100923
Abstract: This experimental laboratory study examines the potential use of tire-derived aggregate (TDA) products as an additive to alleviate the inferior geotechnical properties of a subgrade deposit of clay soil with high expansivity. A total of ten mix designs—the unamended soil and nine soil–TDA blends prepared at 5%, 10% and 20% TDA contents (by dry mass) using three different TDA gradations/sizes—were examined. The experiments included standard Proctor compaction, oedometer swell and unconfined compression tests. The TDA materials’ lower specific gravity, hydrophobic character and higher energy absorption capacity compared with the soil solids led to notable reductions in the soil compaction characteristics. The amendment of the soil with TDA resulted in notable decreases in the rate and magnitude of swelling—the observed reductions were in favor of higher TDA contents, with larger TDA particle size being a secondary factor. Further, for any given TDA size, the variations of strength and toughness with respect to TDA content exhibited rise–fall relationships, peaking at 5% TDA and then decreasing for higher TDA contents. The stiffness and ductility parameters, however, were found to monotonically decrease and increase with the TDA content, respectively. Finally, TDA contents of up to 10%, with gradations equivalent to those of medium and coarse sands, were found to reduce the soil’s swelling potential from high to moderate expansivity, while simultaneously improving its strength-related features, and thus can be deemed as optimum mix design choices from a geotechnical perspective.
Specimen aspect ratio and progressive field strain development of sandstone under uniaxial compression by three-dimensional digital image correlation
Publisher: Elsevier BV
Date: 08-2017
Supplementary material to "Geomechanical modelling of sinkhole development using Distinct Elements: Model verification for a single void space and application to the Dead Sea area"
Publisher: Copernicus GmbH
Date: 16-07-2018
The failure behaviour of poorly cemented sands at a borehole wall using laboratory tests
Publisher: Elsevier BV
Date: 07-2015
The influence of acidizing on propped fractures for productivity enhancement: Eagle Ford laboratory study
Publisher: Elsevier BV
Date: 12-2022
Geomechanical modelling of sinkhole development using Distinct Elements: Model verification for a single void space and application to the Dead Sea area
Publisher: Copernicus GmbH
Date: 16-07-2018
DOI: 10.5194/SE-2018-62
Abstract: Abstract. Mechanical and/or chemical removal of material from the subsurface may generate large sub-surface cavities, the destabilisation of which can lead to hazardous ground collapse and the formation of enclosed depressions termed sinkholes. Numerical simulation of the interaction of cavity growth, host material deformation and overburden collapse is desirable to better understand the sinkhole hazard, but is a challenging task due to the involved high strains and material discontinuities. Here we present a 2D Distinct Element Method numerical simulations of cavity growth and sinkhole development. Firstly, we simulate cavity formation by quasi-static, step-wise removal of material in a single growing zone of an arbitrary geometry and depth. We benchmark this approach against analytical and Boundary Element Method models of a deep void space in a linear elastic material. Secondly, we explore the effects of material properties on cavity stability and sinkhole development. We perform simulated biaxial tests to calibrate macroscopic geomechanical parameters of three model materials that reflect literature and field-based estimates for three materials in which sinkholes develop at the Dead Sea shoreline: mud, alluvium and salt. We show that weak materials do not support large cavities, leading to gradual sagging or suffusion style subsidence. Strong materials support quasi-stable to stable cavities, the overburdens of which may fail suddenly in a caprock or bedrock collapse style. Thirdly we examine the consequences of layered arrangements of weak and strong materials. We find that these are more susceptible to sinkhole collapse than uniform materials not only due to a lower integrated strength of the overburden, but also due to an inhibition of stabilising stress arching. Fourthly we compare our model sinkhole geometries to observations at the Ghor al-Haditha sinkhole site on the eastern shore of the Dead Sea in Jordan. Sinkhole depth to diameter ratios of 0.15 in mud, 0.37 in alluvium and 0.33 in salt are reproduced successfully in the calibrated model materials. The model results suggest that the observed distribution of sinkhole depth/diameter values in each material type may partly reflect sinkhole growth trends.
Pre-Peak and Post-Peak Rock Strain Characteristics During Uniaxial Compression by 3D Digital Image Correlation
Publisher: Springer Science and Business Media LLC
Date: 07-03-2016
Strength and deformation characteristics of cement-mixed gravelly soil in multiple-step triaxial compression
Publisher: Elsevier BV
Date: 02-2012
Geomechanical modelling of sinkhole development using distinct elements: model verification for a single void space and application to the Dead Sea area
Publisher: Copernicus GmbH
Date: 23-11-2018
Abstract: Abstract. Mechanical and/or chemical removal of material from the subsurface may generate large subsurface cavities, the destabilisation of which can lead to ground collapse and the formation of sinkholes. Numerical simulation of the interaction of cavity growth, host material deformation and overburden collapse is desirable to better understand the sinkhole hazard but is a challenging task due to the involved high strains and material discontinuities. Here, we present 2-D distinct element method numerical simulations of cavity growth and sinkhole development. Firstly, we simulate cavity formation by quasi-static, stepwise removal of material in a single growing zone of an arbitrary geometry and depth. We benchmark this approach against analytical and boundary element method models of a deep void space in a linear elastic material. Secondly, we explore the effects of properties of different uniform materials on cavity stability and sinkhole development. We perform simulated biaxial tests to calibrate macroscopic geotechnical parameters of three model materials representative of those in which sinkholes develop at the Dead Sea shoreline: mud, alluvium and salt. We show that weak materials do not support large cavities, leading to gradual sagging or suffusion-style subsidence. Strong materials support quasi-stable to stable cavities, the overburdens of which may fail suddenly in a caprock or bedrock collapse style. Thirdly, we examine the consequences of layered arrangements of weak and strong materials. We find that these are more susceptible to sinkhole collapse than uniform materials not only due to a lower integrated strength of the overburden but also due to an inhibition of stabilising stress arching. Finally, we compare our model sinkhole geometries to observations at the Ghor Al-Haditha sinkhole site in Jordan. Sinkhole depth ∕ diameter ratios of 0.15 in mud, 0.37 in alluvium and 0.33 in salt are reproduced successfully in the calibrated model materials. The model results suggest that the observed distribution of sinkhole depth ∕ diameter values in each material type may partly reflect sinkhole growth trends.
Rock cutting characteristics on soft-to-hard rocks under different cutter inclinations
Publisher: Elsevier BV
Date: 09-2016
Swelling Potential of a Stabilized Expansive Soil: A Comparative Experimental Study
Publisher: Springer Science and Business Media LLC
Date: 13-03-2017
Rockburst characteristics and numerical simulation based on a strain energy density index: A case study of a roadway in Linglong gold mine, China
Publisher: Elsevier BV
Date: 10-2017
Three-dimensional hydro-mechanical model of borehole in fractured rock mass using discrete element method
Publisher: Elsevier BV
Date: 05-2018
Fracture Evolution Around a Cavity in Brittle Rock Under Uniaxial Compression and Coupled Static–Dynamic Loads
Publisher: Springer Science and Business Media LLC
Date: 09-10-2017
Rock Drilling Performance Evaluation by an Energy Dissipation Based Rock Brittleness Index
Publisher: Springer Science and Business Media LLC
Date: 02-05-2016
Use of down-hole triaxial apparatus to estimate the mechanical properties of heterogeneous mudstone
Publisher: Elsevier BV
Date: 12-2008
Small- and large-strain behaviour of a cement-treated soil during various loading histories and testing conditions
Publisher: Springer Science and Business Media LLC
Date: 17-12-2014
Control effect of coal mining solid-waste backfill for ground surface movement in slice mining: A case study of the Nantun Coal Mine
Publisher: Research Square Platform LLC
Date: 06-05-2022
DOI: 10.21203/RS.3.RS-1503421/V1
Abstract: Management of solid waste and protecting the ecological balance of the region are key challenges that the coal mining industry has to face. This study evaluated the effect of solid waste backfilling mining on the overlying strata movement and surface deformation variation pattern in slice mining. The mechanical characteristics of different cemented paste backfills (CPB) were compared. The CPB specimens were made of coal gangue and cement with or without the addition of fly ash. The experiments showed that the mechanical strength of the CPBs made of coal gangue and cement increased dramatically. A numerical simulation was then performed to analyze the variation patterns of the overlying strata displacement and surrounding rock stress distribution before and after filling the 3 lower and 3 upper coal seams with CPB. The CPBs reduced the movement of the surface by 95.1% and 95% during the mining of the 3 lower and 3 upper coal seams, respectively. Finally, we used a mining-induced subsidence prediction and analysis system to predict the influence of the 3 lower and 3 upper coal seams on the ground surface subsidence. It was found that the ground surface subsidence induced by CPB mining was 1/20 that of the cumulative ground surface subsidence caused by caving mining. CPB mining could effectively control the ground surface subsidence caused by multi-slice mining of the thick coal seam, offering protection for buildings above the ground. Our research provides theoretical and technical support for coal mining under buildings subjected to similar conditions.
Predicting the Compactability of Artificially Cemented Fine-Grained Soils Blended with Waste-Tire-Derived Aggregates
Publisher: Springer Science and Business Media LLC
Date: 19-01-2023
A new conventional criterion for the performance evaluation of gang saw machines
Publisher: Elsevier BV
Date: 11-2019
Incorporating asperity strength into rock joint constitutive model for approximating asperity damage: An insight from DEM modelling
Publisher: Elsevier BV
Date: 05-2021
Three-dimensional discrete element modeling of direct shear test for granular rubber–sand
Publisher: Elsevier BV
Date: 05-2018
Degradation of physical and mechanical properties of sandstone subjected to freeze-thaw cycles and chemical erosion
Publisher: Elsevier BV
Date: 11-2018
A cohesive discrete element based approach to characterizing the shear behavior of cohesive soil and clay-infilled rock joints
Publisher: Elsevier BV
Date: 10-2019
University Students’ Preferences for Labour Conditions at a Mining Site: Evidence from Two Australian Universities
Publisher: MDPI AG
Date: 10-03-2020
Abstract: The mining industry makes up a large portion of the gross domestic product (GDP) in Australia, although securing human resources remains a problem in that field. The aim of this paper is to identify Australian university mining students’ preferences, considering it as potential employees’ preferences, for labour conditions at mining sites by means of a discrete choice experiment to promote efficient improvements in labour conditions in the mining industry. The data of 93 respondents analysed in this paper was collected by survey carried out in two universities in Australia. The result of the study showed that students have preferences on several factors such as wage, fatality rate, working position, commuting style, and company. Students having specific sociodemographic characters were found to show specific preferences on labour conditions. The results of this study indicate the potential average of appropriate monetary compensation for each factor.
An experimental study on the relationship between localised zones and borehole instability in poorly cemented sands
Publisher: Elsevier BV
Date: 11-2015
Engineering Reactive Clay Systems by Ground Rubber Replacement and Polyacrylamide Treatment
Publisher: MDPI AG
Date: 14-10-2019
Abstract: This study investigates the combined performance of ground rubber (GR), the additive, and polyacrylamide (PAM), the binder, as a sustainable solution towards ameliorating the inferior geotechnical attributes of an expansive clay. The first phase of the experimental program examined the effects of PAM concentration on the soil’s mechanical properties—consistency, sediment volume attributes, compactability, unconfined compressive strength (UCS), reactivity and microstructure features. The second phase investigated the effects of GR content, with and without the optimum PAM concentration. An increase in PAM beyond 0.2 g/L, the identified optimum concentration, caused the excess PAM to act as a lubricant rather than a flocculant. This feature facilitated reduced overall resistance to sliding of soil particles relative to each other, thereby adversely influencing the improvement in stress–strain–strength response achieved for ≤0.2 g/L PAM. This transitional mechanism was further verified by the consistency limits and sediment volume properties, both of which exhibited only minor variations beyond 0.2 g/L PAM. The greater the GR content, the higher the mobilized UCS up to 10% GR, beyond which the dominant GR-to-GR interaction (i.e., rubber-clustering) adversely influenced the stress–strain–strength response. Reduction in the soil’s swell–shrink capacity, however, was consistently in favor of higher GR contents. Addition of PAM to the GR-blended s les amended the soil aggregate–GR connection interface, thereby achieving further improvements in the soil’s UCS and volume change behaviors. A maximum GR content of 20%, paired with 0.2 g/L PAM, managed to satisfy a major decrease in the swell–shrink capacity while improving the strength-related features, and thus was deemed as the optimum choice.
Swell–compression characteristics of a fiber–reinforced expansive soil
Publisher: Elsevier BV
Date: 04-2018
Improved Shear Strength Performance of Compacted Rubberized Clays Treated with Sodium Alginate Biopolymer
Publisher: MDPI AG
Date: 28-02-2021
Abstract: This study examines the potential use of sodium alginate (SA) biopolymer as an environmentally sustainable agent for the stabilization of rubberized soil blends prepared using a high plasticity clay soil and tire-derived ground rubber (GR). The experimental program consisted of uniaxial compression and scanning electron microscopy (SEM) tests the former was performed on three soil-GR blends (with GR-to-soil mass ratios of 0%, 5% and 10%) compacted (and cured for 1, 4, 7 and 14 d) employing distilled water and three SA solutions—prepared at SA-to-water (mass-to-volume) dosage ratios of 5, 10 and 15 g/L—as the compaction liquid. For any given GR content, the greater the SA dosage and/or the longer the curing duration, the higher the uniaxial compressive strength (UCS), with only minor added benefits beyond seven days of curing. This behavior was attributed to the formation and propagation of so-called “cationic bridges” (developed as a result of a “Ca2+/Mg2+ ⟷ Na+ cation exchange/substitution” process among the clay and SA components) between adjacent clay surfaces over time, inducing flocculation of the clay particles. This clay amending mechanism was further verified by means of representative SEM images. Finally, the addition of (and content increase in) GR—which translates to partially replacing the soil clay content with GR particles and hence reducing the number of available attraction sites for the SA molecules to form additional cationic bridges—was found to moderately offset the efficiency of SA treatment.
A New Method to Simulate Stress–Strain Relations from Multiple-Step Loading Triaxial Compression Test Results
Publisher: ASTM International
Date: 17-09-2013
DOI: 10.1520/GTJ20130005
Experimental Study on Degradation of Mechanical Properties of Sandstone Under Different Cyclic Loadings
Publisher: ASTM International
Date: 08-03-2016
DOI: 10.1520/GTJ20150231
Mechanical Properties of Brown Coal under Different Loading Conditions
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2017
Fracture Energy-Based Brittleness Index Development and Brittleness Quantification by Pre-peak Strength Parameters in Rock Uniaxial Compression
Publisher: Springer Science and Business Media LLC
Date: 22-08-2016
Developing a Damage Model to Simulate Multiple-Step Loading Triaxial Compression Tests in Rocks
Publisher: Springer Science and Business Media LLC
Date: 28-12-2012
Shear failure analysis of a shallow depth unsupported borehole drilled through poorly cemented granular rock
Publisher: Elsevier BV
Date: 12-2014
A borehole stability study by newly designed laboratory tests on thick-walled hollow cylinders
Publisher: Elsevier BV
Date: 10-2015
Characterization of a Sedimentary Soft Rock by a Small In-Situ Triaxial Test
Publisher: Springer Science and Business Media LLC
Date: 11-10-2008
Creation of innovative earthquake resistant steel buildings by dividing the structure into inner and outer parts having interaction by hysteretic dampers
Publisher: JVE International Ltd.
Date: 15-02-2018
Abstract: In conventional seismic design codes of building structures severe structural damage due to large earthquakes is accepted, provided that the structure does not collapse, and life safety of the residents is guaranteed. The extent of this allowed damage can be so high that after earthquake, demolition and reconstruction of the building becomes inevitable, particularly in near-fault areas. The idea followed in this study is to relocate the damage to some predetermined fuse elements, other than the main structural members, so that the building could be quickly and easily repaired, even after major earthquakes. For this purpose, iding the building’s structure into two inner and outer parts with different dynamic characteristics, and creating dynamic interaction between them by using yielding plate or hysteretic d ers was investigated. At first, a 5-storey building model was developed and ided into two interactive parts using hysteretic d ers at roof level, and it was tried, by developing a code in MATLAB environment for solving the nonlinear equations of motion, to find the optimal values of the initial stiffness and the yielding strength of d ers, assuming their behavior to be elastic-perfectly plastic. The results of nonlinear time history analyses (NLTHA), by using a set of selected earthquakes accelerograms, showed that by using appropriate initial stiffness and yield strength, the inert-story drifts of both inner and outer structures can be significantly reduced. Then, 5-, 8- and 11-story steel braced buildings were designed by ETABS, and were ided into inner and outer substructures, and then were modeled in PERFORM-3D software using hysteretic d ers with optimal stiffness and strength, obtained from the MATLAB program, and the seismic responses were compared. Final results of the NLTHA show that the inter-story drift values of outer and inner substructures decreases in average by 20 % and 65 %, respectively, comparing to the original structure. This drift reduction leads to decrease of the damage indices of outer and inner substructures by almost 20 % and 80 %, respectively, comparing to the original structure, making it possible in most cases to have an easily repairable structure.
Effects of Thermal Damage on Strain Burst Mechanism for Brittle Rocks Under True-Triaxial Loading Conditions
Publisher: Springer Science and Business Media LLC
Date: 17-02-2018
A simplified method for determination of the soil–water characteristic curve variables
Publisher: Informa UK Limited
Date: 09-07-2017
A dimensional description of the unconfined compressive strength of artificially cemented fine-grained soils
Publisher: Informa UK Limited
Date: 12-02-2020
Stress–strain relations of cement-mixed gravelly soil from multiple-step triaxial compression test results
Publisher: Elsevier BV
Date: 08-2012
Application of coal mine roof rating in Chinese coal mines
Publisher: Elsevier BV
Date: 05-2018
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