Critical State Study of Natural Silty Sand Instability under Undrained and Constant Shear Drained Path

Rabbi, Abu Taher Md Zillur; Rahman, M.F.; Cameron, D. A.

doi:10.1061/(asce)gm.1943-5622.0001462

Cited by 31 publications

(11 citation statements)

References 60 publications

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“…It can be noted that some DEM studies using spherical particles adopted a rolling resistance model to replicate the angularity features of the particle [48,[61][62][63][64][65][66]. As mentioned previously, the behaviour of granular materials under CSD conditions is linked with the observed undrained behaviour [45][46][47]. Therefore, some undrained (constant volume) simulations were performed in DEM for the critical state soil mechanics (CSSM) investigations.…”

Section: Methodsmentioning

confidence: 99%

“…Such a phenomenon, also known as a constant shear drained (CSD) response, is not uncommon. The CSD conditions can also be investigated under the CSSM framework in laboratory settings [13,[45][46][47]81]. The CSD simulations with the same initial states with ISO7 and ISO12 in Figure 6 were performed for further investigation.…”

Section: Instability During Constant Shear Drained Testsmentioning

confidence: 99%

“…This behaviour is often called constant shear drained (CSD), which is quite common in soil slopes such as tailings dams. It has been found in the literature that the triggering of instability in CSD is associated with the triggering of instability in undrained conditions [45][46][47]. However, the experimental setups often have some challenges in capturing the particle arrangements of soil particles or soil fabric.…”

Section: Introductionmentioning

confidence: 99%

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An Investigation of Instability on Constant Shear Drained (CSD) Path under the CSSM Framework: A DEM Study

2022

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Soil liquefaction or instability, one of the most catastrophic phenomena, has attracted significant research attention in recent years. The main cause of soil liquefaction or instability is the reduction in the effective stress in the soil due to the build-up of pore water pressure. Such a phenomenon has often been thought to be related to the undrained shearing of saturated or nearly saturated sandy soils. Notwithstanding, many researchers also reported soil instability under a drained condition due to the reduction in lateral stress. This condition is often referred to as the constant shear drained (CSD) condition, and it is not uncommon in nature, especially in a soil slope. Even though several catastrophic dam failures have been attributed to CSD failure, the failure mechanisms in CSD conditions are not well understood, e.g., how the volumetric strain or effective stress changes at the triggering of flow deformation. Researchers often consider the soil fabric to be one of the contributors to soil behaviour and use this parameter to explain the failure mechanism of soil. However, the soil fabric is difficult to measure in conventional laboratory tests. Due to that reason, a numerical approach capable of capturing the soil fabric, the discrete element method (DEM), is used to investigate the CSD shearing mechanism. A series of simulations on 3D assemblies of ellipsoid particles was conducted. The DEM specimens exhibited instability behaviour when the effective stress paths nearly reached the critical state line. It can be clearly observed that the axial and volumetric strains changed suddenly when the stress states were close to the critical state line. Alongside these micromechanical observations, the study also presents deeper insights into soil behaviour by relating the macro-observations to the micromechanical aspect of the soil.

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Section: Methodsmentioning

confidence: 99%

Section: Instability During Constant Shear Drained Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Investigation of Instability on Constant Shear Drained (CSD) Path under the CSSM Framework: A DEM Study

2022

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“…Many studies (e.g. Darve et al 2004Darve et al , 2007Daouadji et al 2010;Nicot et al 2011;Dong et al 2015;Rabbi et al 2019) have successfully identified the instability point using Hill (1958) second order work criterion in CSD tests. However, in this study, the instability points were identified at the particle scale from the 'sign change of second order work' (occurrence of negative values in 𝑊 2 𝑃 ) proposed by Nicot et al (2012) given in Eq.…”

Section: Instability Point Using Particle Scale Second Order Work Proposed By Nicot Et Al (2012)mentioning

confidence: 99%

“…In the recent past, several researchers have conducted CSD laboratory tests to investigate the instability behaviour of different soils (e.g. Skopek et al 1994, Anderson andRiemer 1995;Zhu and Anderson 1998;Gajo et al 2000;Chu et al 2003Chu et al , 2012Nicot et al 2011;Dong et al 2015;Rabbi et al 2019).…”

Section: Introductionmentioning

confidence: 99%

DEM Study on the Instability Behaviour of Granular Materials

et al. 2020

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This paper presents the Discrete Element Method (DEM) simulations on the instability behaviour of granular materials during Constant Shear Drained condition (CSD). CSD condition was implemented by decreasing mean effective stress on an assembly of particles under strain controlled loading. In this study, the instability condition was predicted at the particle scale level using particle second order work increment (Nicot et al., 2012). The DEM contact parameters have been calibrated to capture the macroscopic responses and the instability behaviour consistently with the laboratory experimental observations. Using the same contact parameters the effect of different range of initial states at the beginning of CSD condition such as different initial mean effective stress (𝑝 0 ′ ), void ratio (𝑒 0 ) and deviatoric stress (𝑞) on the instability behaviour were analysed. In addition, the micromechanical parameters such as coordination number, anisotropic coefficients (geometric, mechanical) have been extracted to assist in characterising the instability behaviour during CSD condition. The initial stress state of the soil (i.e. at the onset of CSD) condition has shown a significant influence on the evolution of anisotropic coefficients, an evident behaviour change was noted once the CSD condition is imposed. A continuous increase of geometric anisotropy, and a gradual decrease of mechanical anisotropy was observed after the instability condition is reached.

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A Micro-mechanical Study for Constant Shear Drained Behaviour of Granular Material

Nguyen

Rahman

Wang

2019

Sustainable Civil Infrastructures

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Critical State Study of Natural Silty Sand Instability under Undrained and Constant Shear Drained Path

Cited by 31 publications

References 60 publications

An Investigation of Instability on Constant Shear Drained (CSD) Path under the CSSM Framework: A DEM Study

An Investigation of Instability on Constant Shear Drained (CSD) Path under the CSSM Framework: A DEM Study

DEM Study on the Instability Behaviour of Granular Materials

A Micro-mechanical Study for Constant Shear Drained Behaviour of Granular Material

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