Stochastic assessment of hard rock pillar stability based on the geological strength index system

Hard rock pillar is a crucial mass structure to maintain the stability of underground mine. It needs special attention analyze its from point quality. In this paper, geological strength index (GSI) representing quality hard examined as new influence factor stability, and combined with conventional parameters (uniaxial compressive (UCS) intact mass, width (w), height (h), ratio (w/h)) complete stochastic assessment pillar. The 47 actual cases improved by numerical simulation software Flac3D. An empirical formula fitted Least Square method artificial intelligence prediction models are used estimate combining stress conduct probability reliability analysis in Monte Carlo simulation. result showed that UCS w still play vital role maintaining but GSI cannot be ignored. found has greater on sloughing pillars comparison stable failed pillars. Concluding remarks effects well shape (w h). Thus, should considered one input parameter for design mines.