ORCID Profile
0000-0001-5194-7542
Current Organisation
Deakin University
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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.
Civil Engineering | Urban and Regional Planning not elsewhere classified | Structural Engineering | Construction Materials |
Environmentally Sustainable Manufacturing not elsewhere classified | Environmentally Sustainable Construction not elsewhere classified
Publisher: ASTM International
Date: 09-2012
DOI: 10.1520/GTJ104271
Publisher: MDPI AG
Date: 29-03-2023
DOI: 10.3390/APP13074363
Abstract: This study investigates the effects of sand particle shape, in terms of roundness, sphericity and regularity, on the d ing ratio of a dry sand material. Twelve different cyclic simple shear testing scenarios were considered and applied using vertical stresses of 50, 150 and 250 kPa and cyclic stress ratios (CSR) of 0.2, 0.3, 0.4 and 0.5 in both constant- and controlled-stress modes. Each testing scenario involved five tests, using the same sand that was reconstructed from its previous cyclic test. On completion of the cyclic tests, corresponding hysteresis loops were established to determine the d ing ratio. The results indicated that the minimum and maximum d ing ratios for this sand material were 6.9 and 25.5, respectively. It was observed that the shape of the sand particles changed during cyclic loading, becoming progressively more rounded and spherical with an increasing number of loading cycles, thereby resulting in an increase in the d ing ratio. The second part of this investigation involved the development of artificial intelligence models, namely an artificial neural network (ANN) and a support vector machine (SVM), to predict the effects of sand particle shape on the d ing ratio. The proposed ANN and SVM models were found to be effective in predicting the d ing ratio as a function of the particle shape descriptors (i.e., roundness, sphericity and regularity), vertical stress, CSR and number of loading cycles. Finally, a sensitivity analysis was conducted to identify the importance of the input variables the vertical stress and regularity were, respectively, ranked as first and second in terms of importance, while the CSR was found to be the least important parameter.
Publisher: Thomas Telford Ltd.
Date: 12-2016
Abstract: Fracture behaviour of clay during desiccation is an important area in soil mechanics that needs further development. The current approach is to use linear elastic fracture mechanics involving parameters such as fracture toughness, measured from load tests for analysis and modelling of crack propagation. However, the importance of taking crack tip plasticity of the material into consideration has been highlighted by several researchers. This may be especially true for soft and/or slurry clay. The recently developed double ring test is the only desiccation test available today that enables determination of the elastoplastic fracture mechanic parameter J-integral. This parameter accounts for the change in potential energy with fracture propagation. Currently, there are no data for J-integral in the literature as applicable to desiccation cracking. This paper fills this gap by presenting a set of J-integral data for Churchill clay and kaolin clay measured from the double ring test. J-integral values have been calculated for both slurry and compacted clay using corresponding coefficients of linear shrinkage. The challenging task of calculating strains and stresses has been dealt with by using image analysis. In addition, the path independence for J-integral calculation and the behaviour of J-integral with the moisture content are also discussed.
Publisher: Elsevier BV
Date: 04-2021
Publisher: Springer Science and Business Media LLC
Date: 09-05-2020
Publisher: Elsevier BV
Date: 02-2023
Publisher: Springer Science and Business Media LLC
Date: 15-11-2017
Publisher: Springer Singapore
Date: 19-09-2020
Publisher: Thomas Telford Ltd.
Date: 2013
DOI: 10.1680/GEOT.9.P.105
Abstract: This paper elucidates some of the controlling factors governing soil desiccation. The desiccation tests were conducted on three materials – clay, potato starch and milled quartz sand – all three featuring similar fracture energy. Two controlling factors were identified in desiccation cracking, regardless of the material. The first is the tensile stress and strain energy development within the material when the material is restrained against shrinkage. The distribution of the tensile stress will depend on the boundary conditions and material stiffness, and will dictate where cracks are likely to originate. The second factor is that the exact positions of crack initiations will be controlled by the flaws and/or pores within the material. For materials such as clay, with very fine particles, the cracking mechanism is governed by flaws, since the desaturation of fine pores would require very high suction stress, and this requirement leads to sequential cracking and orthogonal crack patterns. If the material has particles giving relatively large and uniform pore sizes with high moisture diffusivity leading to high shrinkage energy prior to cracking, then the fracture energy balance indicates that cracking can occur in near hexagonal patterns with 120° crack initiations, which occur predominantly simultaneously. However, even for materials with lower moisture diffusivity, such as for clay, high desiccation rates can give rise to an ‘effective layer' over which high suctions and strain energy develop, leading to almost simultaneous dense cracking.
Publisher: Springer International Publishing
Date: 28-10-2018
Publisher: Springer Science and Business Media LLC
Date: 19-06-2023
Publisher: Wiley
Date: 20-12-2010
DOI: 10.1002/NAG.894
Publisher: Elsevier BV
Date: 05-2022
Publisher: Informa UK Limited
Date: 21-10-2022
Publisher: Elsevier BV
Date: 07-2021
Publisher: Springer Science and Business Media LLC
Date: 08-2022
DOI: 10.1007/S11440-022-01608-3
Abstract: The coexistence of air and water as a mixture in void spaces in unsaturated soils, makes its mechanical behaviour relatively complex and difficult to be addressed by classical saturated soil mechanics principles. In addition, many engineering problems encountered in practical situations had some part to deal with unsaturated soils and therefore the clear understanding of various behavioural patterns of unsaturated soils is crucial. To date, a large number of attempts are reported in evaluating the mechanical behaviour of unsaturated soils in different stress spaces. The present study evaluates the deviatoric behaviour of compacted unsaturated soils in deviator stress–specific water volume–mean net stress ( $$q, {v}_{\\mathrm{w}}, p$$ q , v w , p ) space. The effect of moisture content, confinement and the stress history on the behaviour of compacted unsaturated kaolin subjected to triaxial compression was assessed and the results showed that there exists a critical state surface for compacted unsaturated soils in $$q- {v}_{\\mathrm{w}}- p$$ q - v w - p space.
Publisher: Canadian Science Publishing
Date: 08-2201
DOI: 10.1139/T11-031
Publisher: Springer Singapore
Date: 11-10-2019
Publisher: MDPI AG
Date: 03-2023
DOI: 10.20944/PREPRINTS202303.0021.V1
Abstract: This paper reports on a series of dynamic simple shear tests conducted to investigate the influence of particle shape on the d ing ratio of dry sand. The tests were conducted on sand s les subjected to simple cyclic shear tests to evaluate their cyclic behavior. The particle shape was quantified using three shape parameters: roundness, sphericity, and regularity. The sand s les were subjected to twelve different scenarios with varying vertical stresses and cyclic stress ratios (CSR), in both constant and controlled stress states. Each scenario involved five cyclic tests, using the same sand that was reconstructed from its previous cyclic test. After each cyclic test, hysteresis loops were created to determine the d ing ratio. The results showed that the shape of the sand particles changed during cyclic loading, becoming more rounded and spherical, which resulted in an increase in d ing ratio. Moreover, the paper presents two artificial intelligence models, an artificial neural network (ANN) and a support vector machine (SVM), which were developed to predict the effect of grain shape on the d ing ratio. The models were found to be effective in predicting the d ing ratio based on the shape of the grain, vertical stress, CSR, and number of loading cycles. Furthermore, a parameter analysis was conducted to identify the most important shape parameter, which was found to be vertical stress and regularity, while parameter CSR was the least important. Overall, this study contributes to a better understanding of the relationship between particle shape and d ing ratio, which could have practical implications for geotechnical engineering applications.
Start Date: 07-2021
End Date: 07-2026
Amount: $5,000,000.00
Funder: Australian Research Council
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