Abstract:Faults can reduce the structural integrity and mechanical strength of coal rock masses, and have adverse effects on underground engineering. In order to explore the stress variation law of the high mining height working face passing through fault groups, with the I030906 high mining height working face of Limin Coal Mine as the research background, FLAC3D program was used to carry out numerical simulation of the excavation and mining stress of the high mining height working face under the influence of fault groups. The results show that during the excavation and mining process, the stress increases as the working face approaches the fault and decreases as it moves away from the fault. The 5 m range on both sides of the fault is the high stress area, which has a significant impact on the production of the working face; under the influence of fault groups, the plastic zone is concentrated at the top of the working face, and most of the plastic zone is caused by shear stress; compared to excavation, the concentration coefficient and influence range of mining induced stress during the mining process of the working face are larger, and the plastic zone is larger; compared with a single fault, fault groups have a greater impact on the mining face in terms of scope and degree.