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以钱家营煤矿5~#煤层巷道掘进过AF_(41)和AF_(42)逆断层为例,采用FLAC~(3D)模拟了巷道掘进围岩应力分布及变化规律。结果表明:断层附近煤岩体初始垂直应力较大,构造应力影响范围为30 m;随着巷道掘进,断层附近围岩应力逐渐增大,应力集中程度更加显著;对于逆断层而言,沿断层下盘向断层掘进更容易导致应力集中,将更容易引起冲击地压。研究结果将为有断层赋存的复杂地质环境中巷道支护和安全掘进提供理论指导。
Taking the AF_ (41) and AF_ (42) reverse faults excavated in coal seam 5 ~ # of Qianjiaying Coal Mine as an example, the stress distribution and variation regularity of surrounding rock in roadway tunneling are simulated by FLAC ~ (3D). The results show that the initial vertical stress of coal and rock mass near the fault is large, and the influence range of tectonic stress is 30 m. With the tunneling, the stress of surrounding rock gradually increases and the stress concentration is more significant. For the reverse fault, Under the plate to the tunneling more easily lead to stress concentration, will more easily lead to rock burst. The results will provide theoretical guidance for roadway support and safety excavation in complex geological environment with fault occurrence.