Abstract:
Aiming at the problem of large deformation and control of surrounding rock of dynamic pressure roadway in deep island working face under strong mining disturbance, taking the 2206 working face of Tenghui Mine as the engineering background, systematic research is carried out by comprehensively applying theoretical analysis, numerical simulation and field monitoring methods. Firstly, the structural model of roadway surrounding rock is analyzed, and the key factors affecting the stability of surrounding rock are clearly defined. Secondly, by comparing and analyzing the reasonable width of coal pillar and the pressure relief effect of drilling, combined with the asymmetric deformation characteristics of roadway, the corresponding asymmetric support parameters are determined, and the "unloading-supporting" cooperative control scheme is put forward. The engineering application shows that after adopting this scheme, the convergence of roof and floor is about 260 mm, and the rib-to-rib convergence is about 471 mm, which significantly improves the integrity and stability of surrounding rock. The results show that the "unloading-supporting" cooperative control scheme can effectively ensure the stability of surrounding rock in deep strong dynamic pressure roadway.