地应力场方向对巷道围岩稳定性的影响

地应力测试结果表明在构造应力场水平应力是垂直应力的1.8～2.7倍,而且两个水平应力之比是1.5～2.5。构造应力场是影响对巷道稳定的主要因素之一。本文运用COMSOL 3D有限元软件在初始应力场轴向变化的情况下模拟了巷道围岩的应力状态,分析得出巷道轴向与最大水平应力方向之间的夹角越大,巷道越不稳定。此时巷道围岩的剪破坏区深入到巷道顶底板。因此在构造应力场掘进巷道时要尽量使最大水平应力方向与巷道轴向一致。

Influence of tectonic stress direction on stability of rock body surrounding underground roadway

As the measurement results of initial stress shows,in the tectonic stress field maximum horizontal stress is about 1.8~2.7 times of vertical stress and ratio of two horizontal stresses 1.5~2.5 times.The initial stress field is one of important factors influencing on the stability of the underground roadway.With varying the axe of initial stress field,stress state of the rock body surrounding the roadway is simulated by using COMSOL 3D finite element method software.Simulated results show that the angle between axes of maximum horizontal stress and roadway is greater,the stability of roadway is worse.Therefore when designing the arrangement of roadway in tectonic stress field,as possible as,be ought to coincident the axe of maximum horizontal stress with one of the roadway.