Author/Authors :
Ma,Tianhui State Key Laboratory of Coastal and Offshore Engineering - Dalian University of Technology, China , Wang,Long State Key Laboratory of Coastal and Offshore Engineering - Dalian University of Technology, China , Suorineni, Fidelis Tawiah School of Mining Engineering - Faculty of Engineering, UNSW Australia, Australia , Tang, Chunan State Key Laboratory of Coastal and Offshore Engineering - Dalian University of Technology, China
Abstract :
Severe damage occurs frequently in mine pillars subjected to shear stresses. The empirical design charts or formulas for mine pillars are not applicable to orebodies under shear. In this paper, the failure process of pillars under shear stresses was investigated by numerical simulations using the rock failure process analysis (RFPA) 2D software. The numerical simulation results indicate that the strength of mine pillars and the corresponding failure mode vary with different width-to-height ratios and dip angles. With increasing dip angle, stress concentration first occurs at the intersection between the pillar and the roof, leading to formation of microcracks. Damage gradually develops from the surface to the core of the pillar. The damage process is tracked with acoustic emission monitoring. The study in this paper can provide an effective means for understanding the failure mechanism, planning, and design of mine pillars.
Keywords :
Numerical Analysis , Failure Modes , under Shear Loading , Mechanisms
