Inversion Analysis of Principal Stress Field of Coal Mining Based on Focus Mechanism

The property of stress field of mine rock mass is an important factor which should be considered for prevention and control of rock burst.The mining disturbance can make the original rock stress field vary.Therefore, in mastering the property of the original rock stress field, the solution method of focus mechanism was applied, based on 55 strong mining shocks with relatively high intensity and clear seismic phase, which produced in the mining of 250104 working face and tunneling of 250105 working face in Huating Coal Mine, the stress release rule of mine mining was reversed, the mine mining stress field and its evolution process was analyzed.Furthermore, it reflected the adjustment and rebalancing process of mining stress field affected by mining, and by comparing with the results of site stress measurement, the mechanism of rock burst in mine was understand. The targeted measures to prevent and control the impact of rock burst were adopted, which effectively reduced the impact of rock burst in coal mine.