李村煤矿2303工作面过大断层支护技术研究

Research on support technology passing large fault in No.2303 Face of Licun Mine

为解决工作面过断层结构区顶板冒落、片帮等问题,以李村煤矿2303工作面为工程背景,通过数值模拟研究了工作面过大断层应力演变规律,得出随着工作面距断层距离的减小,剪切应力逐渐增大,法向应力逐渐减小,同时注浆可降低应力集中的现象,控制工作面过断层围岩的变形破坏。基于数值模拟结果提出了“注浆+锚杆索+金属网”控制措施,并通过现场工业试验验证了该方案的可行性。

In order to solve the problems of roof caving and spalling in the fault structure area of the working face,No.2303 Face of Licun Mine was taken as the engineering background,the stress evolution law of the large fault in the working face was studied by numerical simulation.It was concluded that with the decrease of the distance between the working face and the fault,the shear stress increased gradually,and the normal stress decreased gradually.At the same time,grouting reduced the phenomenon of stress concentration and controlled the deformation and failure of the surrounding rock of the working face.Based on the numerical simulation results,the control measures of'grouting+anchor cable+metal mesh'were proposed,and the feasibility of the scheme was verified by field industrial test.