Cause Analysis and Control Measures for Roadway Bursting Caused by Mining-induced Tremors of Hard Roof–A Case Study of the Inner Mongolia Coalfield, China

Abstract

Rock burst caused by mining-induced tremors is a dynamic disaster in mines that can cause great damage. Based on the mining-induced tremor that occurred at the MKQ CoalMine, Inner Mongolia Autonomous Region, China, on March 3, 2018, the present paper studies the mechanism of mining-induced tremor occurrence using theoretical analysis, numerical simulation, and focal mechanism. The study found four inferior strata and a primary key stratum in the overlying strata on LW3102, and discovered that upon breaking the key stratum movement releases a large amount of energy thereby causing the mining-induced tremor. When the internal stress of the coal pillar in the air-return way of LW3102 reaches 72.77 MPa, the static load stress concentration appears in the coal body near the air-return way, thereby facilitating easy coal body instability due to the overlay of the dynamic load, which in turn produces the rock burst. Based on the analysis of the moment tensor theory, this study finds the ratio of the moment tensor double couple part (MDC) of the strong mining-induced tremor focal to be 8.91%, indicating that the tensile fracture appears in overlying strata on LW3102, and a large amount of energy is released, thereby inducing the mining-induced tremor. The rock burst of the working face is controlled by applying control measures.