Research on regional anti-burst and pressure relief technology of roadway group affected by mining in thick and hard roof working face

Under the impact of special geological and mining technology conditions, the roadway group area near the working face of the mine threatened by the rock-burst disasters is often in the high stress environment with a high impact risk. In order to solve the problem of roadway group regional anti-burst and pressure relief under the impact of mining in thick and hard roof working face, taking the 40309 working face of Shaanxi Binchang Xiaozhuang Mining Co., Ltd. as the engineering background, through on-site monitoring, the microseismic, ground sound and stress data at the end of working face mining are obtained. And the analysis show that the peripheral connecting roadway, chamber and central main roadway at the end of the working face are within the impact range of working face mining, and the impact risk continues to increase due to the impact of mining. The theoretical analysis shows that the reason for the impact risk of roadway group under the impact of mining in 40309 working face is the superposition and accumulation of concentrated dynamic and static loads in roadway group area under the condition of thick and hard roof. Aiming at different roadway areas of 40309 working face, the deep hole and ultra-deep hole roof presplitting blasting anti-burst pressure relief scheme is proposed, and the engineering practice and effect test are carried out. The results show that after adopting the anti-burst pressure relief scheme, the frequency and energy of microseisms in the 40309 working face and the nearby roadway group area are reduced by 55% and 60% respectively, the proportion of the c and d levels in the ground sound monitoring disaster level has decreased by 22.8%, the degree of regional stress concentration of the roadway group is significantly reduced, and the impact risk is significantly reduced. The working face and nearby chambers, connecting roadways and central roadways have no deformation and dynamic phenomena, and the anti-burst effect is good.