摘要
为解决棋盘井煤矿9~#煤层回采巷道底鼓给矿井生产安全带来的不便。通过现场调查、理论分析、数值模拟、摩尔应力圆理论综合分析巷道底鼓机理,找出造成巷道底鼓的原因,确定巷道底鼓类型。提出底板注浆帮角锚杆加固+底板表面浇筑混凝土的方案。利用FLAC~(3D)模拟对比底鼓控制支护技术与底板未支护条件下的在位移量、塑性区、巷道围岩应力状态方面改善明显。通过工程实践监测,此方法控制底鼓成效显著,能有效地减小底板鼓起和巷道变形。
In order to solve floor heave in 9~# coal seam gateway of Qipanjing mine brings inconvenience to the mine production safety. Through field investigation, theoretical analysis, numerical simulation and molar stress circle theory to comprehensive analysis the mechanism of roadway floor heave, find out the causes of floor heave,determine the type of floor heave. Proposed method of floor grouting,angle bolts and pouring concrete on the surface of floor. Use FLAC~(3D) numerical simulation to compare the displacement, the plastic area and the stress state of roadway surrounding rock with the original scheme is improved obviously, and applied to engineering practice. The results of field observation show that this method can effectively control the floor heave and reduce the deformation of floor and roadway.
引文
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