Abstract: In order to study the distortion and destruction process of fractured fault zone under the mining influence, we carried out the electron microscopy, the thin section analysis and the creep test on original samples and duplicated samples of fault materials. According to test results of the electron microscopy and the thin section analysis of test samples, uniaxial and triaxial creep tests for five group samples, which respectively have three kinds of moisture content, we obtained creep characteristics and the distortion destruction characteristics of fault materials. On the basis of that, the flow-solid coupling numerical simulation was made with the aid of FLAC^3D numerical simulation software. The simulation results illustrate the influence of confined water on overlying strata and fault zone, the influence of mining activity on coal floor, the influencing size and scope of fault crushing zone, time effect of confined water.