关键词: 三软煤层, 巷道布置, 错层位, 沿空掘巷, 联合支护

Abstract: In order to solve the problems of large deformation and difficult support of surrounding rock of roadway in three soft coal seams and waste of resources of retaining large coal pillars between sections, the roadway layout and support mode are optimized. The method of combined support of adjacent roadway of roadway excavation along goaf in staggered position and staggered outside of thick coal seam is adopted. Firstly, the coal pillar of roadway along goaf is determined to be 5 m by limit equilibrium zone method, and the mechanical model of key block B is established, It is calculated and analyzed that the key block B will not have sliding instability and rotary instability. Secondly, the combined support technology of adjacent roadways is introduced. Finally, FLAC3D numerical simulation software is used to simulate and compare the surrounding rock support effect during roadway recovery after the original support scheme of roadway excavation along the goaf with staggered layer is optimized and the roadway support scheme is optimized, The results show that the optimized support scheme can stably suspend the shallow surrounding rock of the roof in the deep stable rock stratum and control the deformation of the shallow surrounding rock of the roadway; The side wall anchor cable and the roadway top anchor cable form a joint anchor zone, which enhances the anti separation ability of the roof, strengthens the control ability of joint fissures in different directions of the roof surrounding rock, and can effectively ensure that the roadway surrounding rock is in a stable state.