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为了解决深部高应力影响区沿空掘巷支护难题,以郭屯煤矿-808 m四采区辅助轨道巷为例,分析了巷道变形破坏特征及其影响因素,提出采用“高强高预应力让压锚杆+锚索+金属网+带梯”的非对称锚网索支护方案,并对支护方式和支护参数进行优化。采用有限差分软件FLAC3D,对深部高应力扰动围岩沿空掘巷所采用的非对称支护方案进行了数值模拟,与原方案相比,巷道围岩应力显著降低,顶底板和两帮收敛变形得到有效控制。现场应用及观测结果表明,在深部高应力影响区沿空掘巷采用非对称锚网索支护技术,对围岩应力重新分布起到了较好的作用,达到了理想的巷道围岩控制效果。
In order to solve the problem of roadway driving along gob-side entry in high stress-affected area in deep area, taking the auxiliary track lane of the -808 m mining area in Guo Tun Coal Mine as an example, the deformation and damage characteristics of the roadway and its influencing factors are analyzed. Let pressure anchor + anchor + metal mesh + with ladder "asymmetric anchor net support program, and support methods and support parameters optimization. The finite difference software FLAC3D is used to simulate the unsymmetrical supporting scheme of roadway driving along next goaf with high stress disturbances. Compared with the original scheme, the stress of the surrounding rock of the roadway is significantly reduced, and the top and bottom plates and the two convergent deformation Get effective control. The field application and observation results show that the use of asymmetric bolting wire mesh supporting technology in the roadway driving along gob in the area with deep high stress plays a good role in the stress redistribution of the surrounding rock and has achieved the ideal surrounding rock control effect.