Evolution law of shock bump and CT back analysis in deep coal mining face

In order to study the evolution law of shock bump induced by over-fault mining in deep mining face and the measures to prevent and control rock burst,the energy frequency distribution law of shock bump in the fault area during the mining process of the 11301 working face of Zhaolou Coal Mine was first analyzed and studied. The evolution law of shock bump was analyzed from the perspective of strata movement. Then,after conducting CT back analysis in the working face,the pressure relief measures were taken,and the effect of the pressure relief measures was tested by using the existing impact risk early warning model and early warning criteria. The results show that when the 11301 working face is close to the fault area,the large energy event and frequency are significantly higher than the normal area;during the mining period of the working face,high-energy shock bump occurs in the roof near the two faults. The CT inversion results show the distribution of impact risk areas in the 11301 working face. In the impact risk area,the pressure relief measures of the combination of two large-diameter boreholes, floor loose blasting and roof forced roof breaking were carried out. The anomaly index of the impact risk early warning model was used to evaluate the effect of pressure relief and energy reduction. It was found that the anti -impact effect of pressure relief measures was significant. The research results can provide reference for preventing rock burst accidents in deep mining fault areas.