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针对山东唐口煤矿西部轨道并联巷2 m绞车房硐室埋深超千米,顶板及两帮收敛变形大,底鼓现象严重,需反复维修的工程难题,在分析深部大断面硐室围岩破坏机理的基础上,提出了千米深井大断面硐室双强壳体支护技术,并设计了“锚注支护+格构衬砌支护+强基础梁锚注支护”的支护方案及其工艺流程。工程应用结果表明:25 d后顶底板锚索载荷趋于稳定,监测顶底板锚索最大载荷分别为131 kN和117 kN,最大载荷远小于破断载荷,锚索受力合理;采用双强壳体支护40 d后,围岩变形基本趋于稳定,90 d后顶底板最大移近量仅为64 mm,变形率为1.14%,表面未出现破裂现象,硐室围岩变形得到有效控制;该技术为唐口煤矿创造直接经济效益449万元,经济效益显著。
Aiming at the 2m winch chamber chamber depth exceeding 1000 meters in the parallel tunnel of Tangkou coal mine in Tangkou coal mine in Shandong Province, the engineering problems of convergence and deformation of the roof and two gangs are serious and the kick drum is serious and need repeated maintenance. In the analysis of surrounding rock Based on the failure mechanism, the support technology of double-strong shell with large cross-section of 1000m deep well is put forward and the branch of “anchor injection support + lattice lining support + strong foundation beam anchor support” is designed Protection program and its process. The results of engineering application show that the load of anchor cable on top and bottom plate tends to be stable after 25 days, the maximum load of top and bottom anchor cable is 131 kN and 117 kN respectively, the maximum load is far less than the breaking load and the load of anchor cable is reasonable. After 40 days of support, the deformation of surrounding rock basically stabilized. After 90 days, the maximum displacement of roof and floor was only 64 mm, and the deformation rate was 1.14%. There was no rupture on the surface and the deformation of surrounding rock was effectively controlled. Technology for the Tangkou coal mine to create direct economic benefits 4490000 yuan, significant economic benefits.