Abstract: Based on the prototype of No.21221 face of Qianqiu coal mine, a similar simulation experiment with a fault passing through the mining face is designed. The law of the fault stress evolution and induced overlying strata motion is studied by reproducing the physical process of fault reactivation and coal bumps. Meanwhile the mechanism of fault reactivation under the influence of mining is analyzed. It is observed that the normal stress and the shear stress rapidly increase when the moment is close to fault reactivation, and the risk of fault to slip increases at the same time. Under the mining influence, the fault is easy to reactivate until the working face is 25 meters away from fault along the hanging wall. The mining influence raises the possibility of fault reactivation; the important cause leading to the fault slip is the partial failure of the coal bearing capacity. In addition, the influences of fault slip on the coal act as the unsteady-state impact and the loading-unloading effects.

Key words: coal bumps, fault reactivation, digital speckle correlation method, similar simulation