The failure modes of granular material in undrained cyclic loading: a critical state approach using DEM

Kolapalli, Rohini; Rahman, M.F.; Karim, Rajibul; Nguyen, Hoang Bao Khoi

doi:10.1007/s11440-022-01761-9

Cited by 10 publications

(6 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, the effective stresses of the two simulations were approaching zero at the CS. This phenomenon is referred to as 'complete liquefaction', which has also been observed in many experimental studies [27,[77][78][79][80].…”

Section: Instability Behaviour Of Granular Materials 41 Flow Liquefac...mentioning

confidence: 84%

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

2022

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Instability Behaviour Of Granular Materials 41 Flow Liquefac...mentioning

confidence: 84%

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

2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Subsequently, we will use the dimensionless frequency / ω = d g  (the gravitational acceleration g) and force amplitude 0 =/ d F F F (Fd represents the force required to produce a unit displacement d) to describe the applied harmonic force. The resulting displacement amplitude (A) is determined using a strain sensor [35] while systematically varying the frequency.…”

Section: mentioning

confidence: 99%

“…Characterizing yield is often achieved through strain localization [26,32] and non-affine displacements [33,34]. For densely packed granular materials, the yielding process involves stability and criticality [28,35], which can be explored through interparticle force distributions [36][37][38] and power-law relationships [39]. Spatial positional information is crucial, and a combined approach, such as marginal stability [40,41] and community identification [31], may be employed.…”

Section: Introductionmentioning

confidence: 99%

Yielding and Rheology of vibrated beam-driven granular matter: Hysteresis and Memory

Hong,

Li,

zheng

et al. 2024

Preprint

View full text Add to dashboard Cite

Dense granular matter has attracted significant attention due to its intricate yielding and rheological phenomena. However, unlike sheared or shaken granular systems where energy is injected at the boundaries, the yielding transition induced by vibrated beams has been rarely explored, despite its immense applications in animal and robotic locomotion on sand and underground structural engineering. In this study, we systematically vary the frequency and amplitude of beam vibration to experimentally and computationally investigate the relaxation dynamics of the granular medium. Evidence of ductile yielding behaviors with hysteresis in the frequency domain is presented. Consistency in the dynamic behaviors of both the beam and granular materials has been demonstrated. Through an analysis of mesostructural evolution, including particle motion and mechanical stability, we reveal that the hysteresis originates from anomalous diffusion induced by memory effects. A nonmonotonic constitutive law is proposed through the qualification of memory effects. This study offers insights for theoretical models of vibrated beam-driven flow, emphasizing the distinctive frequency-dependent properties through the bidirectional coupling of elastomer and granular matter.

show abstract

“…There are extensive DEM studies on the behaviour of granular soils in the past decades [17,18,[66][67][68][69][70][71][72][73][74][75]. Dinesh, Thallak and Vinod [41] assessed the dynamic properties and liquefaction behaviour of granular soils under undrained conditions.…”

Section: Cundall and Hartmentioning

confidence: 99%

Advances in Coupling Computational Fluid Dynamics and Discrete Element Method in Geotechnical Problems

Cao,

Nguyen,

Aikins

et al. 2023

Geotechnics

Self Cite

View full text Add to dashboard Cite

In some cases, the water content in granular soil increases to the extent that it becomes saturated, which noticeably alters its responses. For example, the pore water pressure within saturated granular soil would increase rapidly under sudden external loading, which is equivalent to undrained or constant volume conditions. This reduces the effective stress in soil dramatically and may result in catastrophic failure. There have been different numerical approaches to analyse such a failure mechanism of soil to provide a deeper understanding of soil behaviour at the microscopic level. One of the most common numerical tools for such analysis is the discrete element method (DEM) due to its advantage in obtaining microscopic properties (e.g., statistics on particle contacts and fabric), reproducibility and simple feedback control. However, most DEM studies ignore the fluid phase and merely consider the solid particles while the fluid pressure is indirectly calculated by mimicking undrained condition to a constant volume condition. Note that fluid’s influence does not limit to the change of pore water pressure. For example, the external loading would induce the movement of fluid, and the fluid-solid interaction could subsequently drag the solid particles to shift within the system. In addition, the state of soil could change from solid to suspension under an excess hydraulic gradient. Therefore, the study of the fluid-solid mixture is essential as it is a typical scenario in geotechnical practice, and the simulations of saturated sand should be conducted in numerical forms in which both the solid and fluid phases can be modelled.

show abstract

The failure modes of granular material in undrained cyclic loading: a critical state approach using DEM

Cited by 10 publications

References 73 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

Yielding and Rheology of vibrated beam-driven granular matter: Hysteresis and Memory

Advances in Coupling Computational Fluid Dynamics and Discrete Element Method in Geotechnical Problems

Contact Info

Product

Resources

About