Abstract
We employ a recently developed hierarchical multiscale approach based on Finite-Discrete Element Method (FEM/DEM) coupling to revisit the borehole stability problem for granular rocks. The progressive failure of the borehole is simulated by gradually reducing the support pressure. A Representative Volume Element (RVE) with dual-porosity structure is adopted to characterize the material response of high-porosity quartz-rich sandstone without considering particle crushing. Compaction bands, or so-called ‘fracture-like’ breakouts are reproduced which initiate almost from the crossing points of \( \sigma_{0} \) springline and the borehole wall and penetrate into the rock matrix along radial direction. Further development of the borehole is characterized by curved shear bands forming ‘V-shaped’ patterns.
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