地下开采诱发斜坡崩塌失稳破坏机制分析

以贵州大方老鹰岩山体崩塌为例,在分析边坡地质条件及地下开采的基础上,崩塌的形成机制和发展过程可以分为:煤层开采阶段,采空区塌陷阶段,崩塌形成阶段。通过软件FLAC3D数值模拟,研究边坡在地下开采因素作用下的变形破坏特征。结果表明:地下开采将会引起坡体应力重新分布,产生差异沉降和应力集中,是形成该崩塌的决定性因素。

Analysis on Mechanism of Slope Failure Induced by Underground Mining

Taking the collapse of Laoying Cliff, Dafang, Guizhou as an example, depending on analysis of slope’s geological condition and underground mining, the formation mechanism and development course of collapse can be divided into three stages: coal mining, goaf subsidence and collapse and then numerical simulation is made by FLAC3D to study the deformation and failure characteristics of the slope under the action of underground mining. The results show that underground mining may cause the redistribution of slope stresses, then differential settlement and stress concentration, which is the factor determining the collapse thereof.