Abstract:
In order to solve the problem of surrounding rock control of gob-side entry driving in deep continuous filling working face, taking 1128 headentry of Xingdong Coal Mine as the engineering background, the distribution law of deviatoric stress of surrounding rock of gob-side entry driving in 1126 working face under different filling rate was explored with the help of FLAC
3D numerical simulation software, and simulated and analyzed the evolution characteristics of deviatoric stress of surrounding rock affected by mining. The results show that the shallow surrounding rock of the gob-side entry driving forms a low deviatoric stress area of the whole section of the ring roadway, the depth of the low value area of the roof is obviously less than that of the two sides and the floor, and there is a high value area of deviatoric stress on the four sides of the roadway outside the low value area; the maximum deviatoric stress zone of surrounding rock is located in the upper right of the roadway, and the peak value is greater than 20 MPa. When the filling rate is greater than 90%, the deviatoric stress value around the roadway surrounding rock gradually decreases and is symmetrically distributed along the two sides of the roadway; the high concentrated stress formed by filling mining on the surrounding rock of the roadway in the leading section is mainly distributed 0 m to 15 m in front of the working face. The surrounding rock at the two corners of the roof and floor of the roadway is affected by the deviatoric stress of the roadway surrounding rock to form four "prominent deformation areas". Combined with the simulation analysis results, the prestressed bearing structure of rockbolt and anchor cable and the filling performance of high water material in goaf, the combined support technology of "super strong bolt + large diameter and high elongation cable" in roadway surrounding rock is proposed and applied to field engineering practice. The results show that this technology can effectively control the surrounding rock of gob-side entry driving of filling face in deep continuous mining.