构造应力场中的巷道布置

Roadway Layout in Tectonic Stress Field

为了了解构造应力对不同布置方向巷道稳定性的影响量,本文首先在全平面应变模型的基础上进行坐标变换,推导出构造应力场中不同布置方向的巷道围岩应力公式与位移公式,并讨论了随巷道轴向与构造应力方向夹角的变化,巷道不同位置的应力、位移变化规律.其次采用FLAC3D软件模拟地下岩体中巷道不同布置方向的塑性区分布状态,应力、位移的变化规律.结合在兖州矿区进行的巷道位移观测得到的构造应力方向,分析其之间的变化关系.研究结果表明,当巷道轴向与最大主应力方向平行时,构造应力对巷道稳定性影响最小.

In order to find out the effect quantity of the tectonic stress on the stability of roaaways in different directions, we deduced stress formula and displacement formula of surrounding rocks of roadways with different directions based on the coordinate transformation in complete plane strain model and discussed the variation rules of stress and displacement along with the change of angle between the two directions of roadway axis and tectonic stress. In addition, we used the software FLAC3D to simulate the distribution of plastic region and the variation rules of the stress and displacement of surrounding rocks in roadways with different directions. The displacement of the roadway in Yanzhou mining area is observed, the stress direction obtained, and their relations analyzed. The result shows that when the direction of roadway axis is parallel to that of the greatest principal stress, the effect of tectonic stress on the stability of the roadway is the smallest.