深部高应力回采巷道变形破坏机理与控制技术

针对深部高应力回采巷道变形破坏严重与难控制的问题，以任家庄煤矿210504工作面回风巷为工程背景，研究了其变形机理和稳定性控制技术。对该工作面运输巷的变形破坏代表性地段进行了现场调查，发现该巷为典型的深部高应力回采巷道，变形破坏特征为强烈底鼓、两帮严重内挤、顶板整体下沉；采用数值模拟的方法研究了巷道围岩的变形破坏机理，认为该巷的变形破坏是由低预紧力锚杆支护体系不能控制深部高应力巷道围岩所导致；对210504工作面回风巷提出了“锚杆+锚索+W钢带+锚网”的综合支护方式。工程实践表明，巷道底鼓量为220 mm左右，两帮移近量262 mm左右，分别比原支护方案降低59.1%和40.2%左右，巷道围岩保持稳定。该研究成果可为该矿或同类矿井的稳定性控制提供借鉴。

Deformation and failure mechanism and control technology of deep high stress coal winning roadway

Aiming at the serious deformation and failure of deep high stress mining roadway and difficult to control，taking the return air roadway of 210504 working face of Renjiazhuang Coal Mine as the engineering background，the deformation mechanism and stability control technology are studied.The field investigation on the representative section of deformation and failure of the transportation roadway in the working face shows that the roadway is a typical deep high stress mining roadway，and the deformation and failure characteristics are strong floor heave，serious internal extrusion of two sides and overall subsidence of the roof.The deformation and failure mechanism of roadway surrounding rock is studied by numerical simulation.It is considered that the deformation and failure of the roadway is caused by the failure of low preload bolt support system to control the surrounding rock of deep high stress roadway.The comprehensive support mode of "bolt + anchor cable + W steel belt + anchor mesh" is proposed for the return air roadway of 210504 working face.The engineering practice shows that the floor heave of the roadway is about 220 mm and the approach of the two sides is about 262 mm，which is about 59.1% and 40.2% lower than the original support scheme respectively，and the surrounding rock of the roadway remains stable.The research results can provide reference for the stability control of this mine or similar mines.