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为解决云驾岭矿煤巷变形大、围岩破碎、支护困难、返修率高等工程问题,采用地质调查、理论分析、数值计算、物化分析、现场测试和实验室试验等手段,揭示大变形煤巷围岩失稳破坏机理。基于深、浅部注浆加固,建立双层环状支护带承载体系,提出切圆拱断面、帮部深孔锚索支护、护表加强的锚注支护一体化技术。工程应用表明:浅部注浆封闭巷道周边破碎围岩,与锚杆联合形成内部支护带,提高两帮围岩强度;深部注浆配合加长锚索形成主动支护带,以锚索端部为锚固点,使浅部、深部围岩形成有机整体,增强围岩承载强度;护表加强实现应力均匀分布,提高表面支护刚度并增大有效支护面积。现场监测显示,该技术有效降低围岩变形,保障了巷道围岩稳定。
In order to solve the engineering problems such as large deformation, surrounding rock crushing, supporting difficulties and high rework rate in Yunjialing Coal Mine, geological deformation analysis, geological analysis, numerical calculation, physical and chemical analysis, field test and laboratory test are used to reveal the large deformation Failure mechanism of surrounding rock in coal roadway. Based on the deep and shallow grouting reinforcement, a double-layer annular support belt bearing system was established, and the integrated technology of cutting anchor support with circular section and deep hole anchor support and strengthening watchguard was put forward. The engineering application shows that the shallow grouting closes the surrounding rock around the tunnel and forms an internal supporting belt together with the rock bolt to increase the strength of the surrounding rocks; the deep grouting and the longer grouting rope form the active supporting belt, For the anchor point, the shallow and deep surrounding rock form an organic whole, which enhances the bearing strength of the surrounding rock. The surface protection strengthens the uniform stress distribution, increases the surface support rigidity and increases the effective support area. Site monitoring shows that the technology effectively reduces the deformation of surrounding rock and ensures the stability of roadway surrounding rock.