Abstract:
With the coal mining entering the deep, the deformation and instability of the surrounding rock of the mining roadway can be effectively controlled by clarifying the spatiotemporal evolution characteristics of the mining stress field in the deep thick coal seam mining process and realizing the accurate control of the damage degree of the surrounding rock of the stope under the influence of mining.Therefore, taking a mine as the engineering background, theoretical analysis, numerical simulation and field measurement are used to analyze the working resistance of the support, and it is concluded that during the mining period of the working face, the central end is affected by mining, and the mining stress is the largest.Combined with the field practice, the multi-dimensional coupling control technology scheme of “roof hydraulic fracturing+large diameter drilling pressure relief on solid coal side+grouting reinforcement on coal pillar side” is put forward.According to the field observation results, the peak stress of surrounding rock in stope decreased by 63.80%~84.56%,and the phenomena of strata behavior such as large deformation of mining roadway side were obviously alleviated.The surrounding rock collaborative control technology effectively ensures the overall stability of the surrounding rock in the stope, reduces the disaster risk in this area, and ensures the safe mining of the working face.