上湾煤矿运输大巷过断层围岩变形破坏特征研究

Study on deformation and failure characteristics of surrounding rock of transportation roadway passing through fault in Shangwan Coal Mine

针对巷道过断层极易产生大变形、支护结构失稳等问题,以上湾煤矿中六运输大巷过断层为工程背景,采用数值模拟和现场实测方法分析巷道过断层中围岩变形特征。结果表明巷道过断层中围岩以剪切变形为主,在断层前后10 m范围内围岩变形量较大,围岩破坏先后顺序依次为底板、两帮和顶板,上盘影响段巷道底板和帮部围岩为主要控制区域,下盘影响段顶板和帮部围岩为主要控制区域,并提出巷道关键部位密集锚索支护+反底拱全断面锚杆支护的围岩控制技术,围岩最大位移量均小于120 mm,工业试验结果较为理想。

In view of the problems such as large deformation and instability of supporting structure when the roadway passes through the fault,taking the transport roadway passing through the fault in Shangwan Coal Mine as the engineering background,the deformation characteristics of surrounding rock when the roadway passes through fault is analyzed by numerical simulation and field measurement.The results show that the main deformation of surrounding rock is shear deformation.Within the scope of 10 m before and after the fault,the deformation of surrounding rock is large,and the failure sequence of surrounding rock is floor,two sides and roof.The main control area is roadway floor and wall rock in hanging wall influence section,and roof and side rock in footwall influence section.Finally,the surrounding rock control technology for the key section of the roadway with dense anchor cable support+inverted arch bolt support is put forward.The industrial test shows that the maximum displacement of surrounding rock is less than 120 mm when the roadway passes through the fault,and the supporting effect is good.