浅埋工作面回采对边坡稳定性的影响研究

Research on the Influence of Shallow Buried Face Mining on Slope Stability

针对下伏工作面回采造成边坡失稳问题,通过数值模拟研究了不同工作面回采位置下坡体滑动和塌陷特征,分析了采空区和坡体塑性区分布规律。结果表明:工作面位置显著影响边坡滑动和塌陷特征;工作面回采后,顶板岩层成为边坡土体的主要承载结构,若工作面位于边坡滑动侧,会进一步提高边坡土体滑动空间;当工作面位于坡脚下部时,回采后边坡稳定性最高,当工作面位于坡体下部时,回采后边坡稳定性最差;采空区上部岩层以拉伸、剪切混合破坏为主,边坡土体以剪切破坏为主。

In response to the problem of slope instability caused by underground mining,the characteristics of slope sliding and collapse at different mining positions were studied through numerical simulation,and the distribution patterns of goaf and slope plastic zone were analyzed.The results show that the position of the working face significantly affects the characteristics of slope sliding and collapse.After the mining of the working face,the roof rock layer becomes the main bearing structure of the slope soil.If the working face is located on the sliding side of the slope,it will further increase the sliding space of the slope soil.When the working face is located at the bottom of the slope,the stability of the slope after mining is the highest.When the working face is located at the bottom of the slope,the stability of the slope after mining is the worst.The upper rock layer in the goaf is mainly subjected to mixed tensile and shear failure,while the slope soil is mainly subjected to shear failure.