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
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
[center][img]https://i.postimg.cc/vmf7gVtB/0-CKg-W8-AWo0l0-Rs-A36i3n-Xkd-Sb-Oc-ZXOi0.jpg[/img] [b]ESSS Rocky DEM 22.1.2 (x64) | File Size: 910.9 MB[/b][/center] ROCKY is an effective software for modeling granular media by the method of discrete elements (MDE or DEM - Discrete Element Method), al.
In this paper, a newly developed 3-dimentional discrete element model (DEM) for gravel-rubber mixtures (GRMs), namely DEM4GRM, that is capable of accurately describing the macro-scale shear response (from small to large deformation) of GRMs in a direct shear box apparatus is presented. Rigid gravel grains are modelled as simple multi-shape clumps, while soft rubber particles are modeled by using deformable 35-ball body-centered-cubic clusters. Mixtures are prepared with different volumetric rubber content (VRC) at 0, 10, 25, 40 and 100%, statically compressed under 30, 60 and 100 kPa vertical stress and then sheared, by closely simulating a reference laboratory test procedure. The variation of micro-scale factors such as fabric, normal and tangential force anisotropy is carefully examined throughout the shearing process and described by means of novel micro-mechanical relationships valid for GRMs. Moreover, strong-force chains are scrutinized to identify the transition from rigid to so
[img]https://i.postimg.cc/j2z6q8sy/ESSS-Rocky-DEM-22-1-0-x64.jpg[/img] [b]File size: 800 MB[/b] ROCKY is an effective software for modeling granular media by the method of discrete elements (MDE or DEM - Discrete Element Method), allows you to quickly and as realistic as possible to model ix bulk.