在动载作用下钻孔卸压和预应力注浆锚索底臌治理巷道的动态响应研究

Study on dynamic responses of roadway controlled by borehole pressure relief and prestressed grouting anchor cable on the floor under dynamic load

利用数值分析方法研究了常村矿井巷在动载作用下原巷道、钻孔卸压、预应力注浆锚索底臌治理巷道的动态响应。研究结果表明:在锚索加固区范围内预应力注浆锚索底臌治理巷道相对于原巷道和卸压孔底臌治理巷道的应力峰值均有所减小;原巷道和卸压孔底臌治理巷道在动载作用下引起的位移增量比较接近,而预应力注浆锚索底臌治理巷道位移增量明显要小于原巷道和卸压孔底膨治理巷道位移增量;每种支护形式的底板是振动最剧烈的地方,注浆锚索底臌治理巷道拱底振动速度和振动加速度峰值最大,其次是卸压孔底臌治理巷道,最小是原巷道。研究结果可为动载作用下矿井巷底臌的治理技术设计提供参考。

The numerical analysis method is used to study dynamical response of roadway of Changcun coal mine controlled by borehole pressure relief and prestressed grouting anchor cable on the floor under dynamic load. The results show that: the stress peak of roadway with prestressed grouting anchor cable on the floor is less than that of the original roadway and roadways controlled by borehole pressure relief in the anchor reinforcement area. Displacement increments of the original roadway and roadway with pressure relief hole are close relatively under the dynamic load, and displacement increment of roadway with prestressed grouting anchor cable is significantly less than that of the other two cases. The floor is the most violent place, and the peak value of vibration velocity and acceleration of roadway with prestressed grouting anchor cable reaches its maximum. Second, its sub-maximum occurs in the roadway with pressure relief hole, and the minimum in the original roadway. The results may provide reference for the technical design for harnessing floor heave under dynamic load.