Abstract：In this paper, the stress variation of nearby fault structure F147 is studied during the coal mining based on the numerical simulation of the stress distribution law in the coal rock for Yanmazhuang Mine by using FLAC3D software.The results show that the coal rock is broken;the fracture is expanded and the fault structure will be activated under the influence of the mining.With the reducing in distance between coal bed and rock roof, the destroy degree is aggrabated, so the stress at the nearby fault structure is released, and the crushing and shearing stress concentration of the fault can be relieved, but the pulling stress is added.According to the further studies, the range of influence is 10 meters, which shows that the proposed simulating methods can analyze the distribution law of stress field of coal rock during the mining in crossing fault, and the results can provide the reference value for practice.

Keyword：fault;heading tunnel;stress distribution;numerical simulation;