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"A Coupled LBM – DEM Modelling of Cone Penetration Test in Granular Mat" by Krishna Allulakshmi

Water ingress in soils through infiltration can trigger instability leading to failures in slopes and embankments under drained conditions. Subsequent investigations on such failures have shown that the infiltration of water in soils can cause a reduction in effective stress thus triggering the instability. In addition, studies have indicated that the constant shear drained (CSD) triaxial test can depict an unstable phenomenon where effective stress is continuously reduced. In the current study, the first section of research focuses on the Discrete Element Method (DEM) modelling of the instability behaviour of granular materials during CSD conditions. The CSD condition was modelled by decreasing the mean effective stress on an assembly of particles under strain-controlled loading. The instability condition was predicted at the particle scale level using particle second-order work increment. The DEM contact parameters have been calibrated to capture the macroscopic responses and the ins ....

Discrete Element Method , Clean Sands , Lattice Boltzmann Method , Lattice Boltzmann Method ,

"Numerical Modeling of Cone Penetration Test: An LBM-DEM Approach" by Krishna Allulakshmi, Jayan S. Vinod et al.

In this paper, the discrete element method (DEM) is coupled with the Lattice Boltzmann method (LBM) to model the cone penetration test (CPT) of a saturated granular media. The coupled numerical model was calibrated using one-dimensional (1D) consolidation theory. The results obtained from the 1D consolidation test simulation showed good agreement with the analytical equation that was proposed by Terzaghi. A series of LBM-DEM simulations were carried out to understand the effect of the penetration rate on the behavior of saturated granular materials during the CPT. The model has predicted a significant influence on the excess pore fluid pressure (Δu) and an insignificant influence on the cone resistance responses (qt) and has qualitatively captured the effect of penetration rate, which was consistent with the experimental data. The simulation results showed that Δu increased with an increase in the penetration rate. The particle displacement and fluid velocity (U) contours have provid ....

Lattice Boltzmann , Cone Resistance , Discrete Element Method , Xcess Pore Pressure , Lattice Boltzmann Method , Ne Dimensional Consolidation Test ,

"MODELLING SUBGRADE FLUIDISATION UNDER RAIL TRACKS BASED ON LBM-DEM COU" by Minh Nghi Phan

"MODELLING SUBGRADE FLUIDISATION UNDER RAIL TRACKS BASED ON LBM-DEM COU" by Minh Nghi Phan
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Lattice Boltzmann Method , Discrete Element Method , Computational Fluid Dynamics ,