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

When mining near the fault can cause the fault to slip and release energy, resulting in rockburst 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 response of fault slip below the impact of mining. The release patterns of energy from fault slip are compared between mining via the fault from the hanging wall and mining via the fault from the footwall. The dynamic response characteristics of coal and rock mass under the disturbance of fault slip induced dynamic loading are revealed. This research suggests that the fault slip seismic moment (M0) of the panel mined via the fault from footwall is substantially higher than from hanging wall. Moreover, the disturbance of the footwall panel mining via the fault leads to a more severe disturbance of the surrounding rock mass, resulting in a higher risk of rockburst. 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 dynamic load is relatively small, the maximum abutment stress increases, and the dynamic load increases the energy storage of 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 rockburst, and the stronger the dynamic load and greater static load of the rock, the more the manifestation of rockburst. Based on FLAC3D numerical simulation, a dynamic calculation method for fault slip under mining influence was proposed. The release patterns of energy from fault slip are compared between mining via the fault from the hanging wall and mining via the fault from the footwall. The dynamic response characteristics of coal and rock mass under the disturbance of fault slip induced dynamic loading were revealed.Compared with mining the panel via the fault from hanging wall, the fault released more energyM(0) when mining the panel via the fault from footwall, resulting in a higher vibration velocity of the surrounding rock in the mining area and a higher possibility of rockburst.Based on energy theory, an energy criterion for the prevalence of fault slip type rockburst was proposed. The initiation and severity of fault slip rockburst are closely related to the magnitude of the energy released by fault slip and the static stress of surrounding rock. The potential of rockburst was higher under the combined effect of high static stress and dynamic load of fault slip.