关键词: 围岩失稳, 围岩裂隙监测, 异型锚索, 二次加固

Abstract: In order to solve the support problem of the mining roadway in Huayang No.1 Mine under the mining disturbance of the adjacent working face，taking the return air roadway support of the 151306 working face of the mine as the engineering background，the monitoring method of surrounding rock fracture is used to grasp the deformation and instability characteristics of the surrounding rock，and the reasons for the instability of the surrounding rock are analyzed. The repair and reinforcement scheme is proposed and verified by industrial tests. The results of mine pressure monitoring show that under the influence of mining near 151304 working face，the surrounding rock of 151306 return airway under the original anchor net cable support condition has serious convergence deformation and large range of loose failure. The depth of loose failure of roof strata is 2.8~3.5 m，and the depth of loose fracture of solid coal side is 3.0~3.5 m，which can not guarantee the stability of surrounding rock of roadway. The special-shaped anchor cable with umbrella�shaped reed device is designed for secondary reinforcement. The tension test in 151306 return air trough shows that the special-shaped anchor cable can provide stable anchoring force ( ≥ 200 kN ) under the condi‐ tion of broken surrounding rock，which can effectively solve the anchoring problem of traditional anchor ca‐ ble in weak surrounding rock. The detailed reinforcement support scheme of 151306 return air crossheading is designed，and the original bolt and anchor cable are re-prestressed or tensioned. The surrounding rock de‐ formation data show that the deformation rate and deformation of surrounding rock after repair and reinforce‐ ment are significantly lower than those under the original support conditions. Compared with the original sup‐port，the convergence of the two sides is reduced by 77.8 %，and the convergence of the roof and floor is re‐ duced by 69.2 %，which achieves better surrounding rock control effect.

Key words: surrounding rock instability, monitoring of surrounding rock fracture, special-shaped an‐ chor cable, secondary reinforcement