Study on the fault slip rule and the rockburst mechanism induced by mining the panel through fault

Abstract

Abstract When mining operations are conducted near faults can cause the fault to slip and release energy, resulting in a rock burst and posing a significant safety risk to coal mine production. This paper proposes a numerical simulation method, based on FLAC3D numerical simulation, for calculating the dynamic forces of fault slippage below the impact of mining. The release patterns of energy from fault slip are compared and analyzed between mining across the fault from the hanging wall and mining across the fault from the footwall. The dynamic response characteristics of the mining area under the disturbance of fault slip-induced loading are revealed. This research suggests that the fault slip seismic second (M0) of the panel mined via the fault from the footwall is substantially higher thru from striking wall. Moreover, the disturbance of the footwall mining face across the fault leads to a more severe disturbance of the surrounding rock mass, resulting in a higher risk of dynamic pressure. Plastic failure of the rock surrounded in the mining area under the strong dynamic loading of fault slip leads to a significant reduction in peak abutment stress, releasing tremendous energy. When the disturbance caused by fault slip-induced loading is relatively small, the maximum abutment tension increases, and the dynamic load increases the energy storage of stope surrounding rock. Based on energy theory, an energy criterion for the occurrence of fault slip-type rockburst has been proposed. The results suggest that strong fault slip dynamic load has an obvious inducing effect on rock burst, and the stronger the dynamic load and greater static load of the rock surrounding the stope, the more the manifestation of rockburst.