某矿充填采空区围岩稳定性数值模拟研究

Numerical Simulation on the Stability of Surrounding Rock in the Goaf of a Mine

以某矿工程地质为依据,采用了FLAC3D软件模拟研究了不同充填体强度下围岩竖向应力、竖直位移的变化,分析了不同分层开采方式对围岩竖向应力、竖向位移的变化,及其对围岩稳定性的影响。结果表明:充填体强度越大,围岩的竖向位移、竖向应力都呈减少的趋势,增大充填体强度对围岩稳定性有利;在充填体强度为1.2 MPa的条件下,在充填体上层开采比下层开采的围岩竖直应力大,但竖直位移相对较小。

Based on the engineering geology of a mine, the FLAC3D software was used to simulate and study the vertical stress and displacement changes of surrounding rock under different strengths of filling body. The vertical stress and displacement changes of surrounding rock under different slicing methods were analyzed, as well as its influences on the stability of surrounding rock. The results showed that with the increase of filling strength, the vertical stress and the displacement of surrounding rock had a decreasing trend. Therefore, increasing the filling strength was good for the stability of surrounding rock. Under the 1.2 MPa of filling strength, the vertical stress of surrounding rock mining in upper filling body was larger than that mining in lower filling body, but the vertical displacement in upper filling body was slightly shorter.