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"A Hybrid Approach to Rock Pre-conditioning Using Non-explosive Demolit" by V. R.S. De Silva, H. Konietzky et al.

This study presents a novel approach to rock pre-conditioning to promote the sustainability of low-grade ore mining applications such as in-situ recovery and cave mining. The proposed method involves a two-stage hybrid approach, utilizing soundless cracking demolition agents (SCDAs) to initiate radial fractures in a predrilled host rock, followed by hydraulic stimulation to extend the fractures. SCDA injection in the first stage creates multiple radial fractures around the injection well. However, the extent of fractures is limited to the near vicinity of the injection well. To overcome this limitation, the second stage involves the application of hydraulic stimulation to extend the initiated fractures, which produces a greater fracture density compared to pure hydraulic stimulation. The concept was assessed using a fully coupled hydro-mechanical discrete element model that simulated the hybrid fracturing method on crystalline rock at the grain scale. The results indicate that the prop ....

Discrete Element Method , Train Scale , Hydraulic Stimulation , Pre Conditioning , Ock Heterogeneity , Oundless Cracking Demolition Agents ,

"DEM investigation of strength and critical state behaviours of sand un" by Min yi Zhu, Guo bin Gong et al.

This paper investigates the strength and critical state (CS) behaviours of sand under axisymmetric stress paths with different shearing modes using discrete element method (DEM). The stress paths include axial compression (AC) and axial extension (AE), and the shearing modes include conventional triaxial (CT) mode and constant mean pressure (CP) mode. A series of dense and loose sand samples are generated for this purpose with confining pressures ranging from 100 kPa to 900 kPa. The CS is achieved for all samples after an axial strain (absolute value) of about 45%. The CS value of deviator stress is unique and independent of the initial packing densities for the samples with a given confining pressure, but the unique deviator stress under AC is generally larger than that under AE. The CS values of the stress ratio are independent of the shearing modes and the confining pressures, but are dependent on the stress paths. The CS friction angle for a given confining pressure is found to be ....

Axisymmetric Stress Path , Critical State , Discrete Element Method , Ailure Criterion , Hearing Mode ,

ESSS Rocky DEM 23.1.1 (x64)

[img]https://i.postimg.cc/KYftFsBc/0-CKg-W8-AWo0l0-Rs-A36i3n-Xkd-Sb-Oc-ZXOi0.jpg[/img] [b]ESSS Rocky DEM 23.1.1 (x64) File Size: 914.3 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 quickl. ....

Conveyor Dynamics Inc , Granular Dynamics International , Element Method , Discrete Element Method , Conveyor Dynamics ,

"DEM study on the dynamic responses of a ballasted track under moving l" by Jing Chen, Jayan S. Vinod et al.

This paper presents the discrete element modeling of the dynamic response of a ballasted track under moving loads. The DEM model, consisting of sleepers, ballast, and sub-ballast, has been calibrated using field and laboratory data. This model was further used to examine the dynamic responses of the ballasted track subjected to a series of moving traffic loading representing various train axle loads and speeds. The results show that the permanent settlement of the sleeper, the breakage of ballast, and the dynamic stresses in the track substructure increase with an increase in train axle load and speed. As the train moves, the magnitudes of dynamic stresses and the orientations of principal stress axes in the track change continuously, and a more pronounced principal stress rotation is observed at sleeper edges than those underneath sleepers. The capping layer is found to play a critical role in reducing train-induced stress and further alleviating the disturbance from the trains to the ....

Ballast Breakage , Discrete Element Method , Oving Loading , Rincipal Stress Rotation , Leeper Settlement ,

"DEM simulations of critical state behaviour of granular materials unde" by Shiva Prashanth Kumar Kodicherla, Guobin Gong et al.

The present study investigates the critical state behaviour of granular assemblies composed of clumped particles under four different drained axisymmetric triaxial stress paths, using the discrete element method (DEM). A series of numerical samples were prepared at initial states with different density indexes (ID) and different initial confining pressures (po′). These samples were sheared to large strains, at which constant stresses and volumes were maintained to reach the critical state. The evolution of stress ratio under the same loading mode (for the same intermediate principal stress ratio, b) is shown to yield an almost identical behaviour independent of stress paths, whereas the stress-strain response depends on the stress paths. Four different axisymmetric stress paths all share the same unique friction angle at critical state, indicating the Mohr-Coulomb failure criterion is the appropriate critical state strength criterion, which is at least true for the axisymmetric stres ....

Critical State , Discrete Element Method , Rained Behaviour , Riaxial Stress Paths ,