L 工作面露天转地下开采边坡及围岩的移动变形机理分析

摘要

Taking a L working face of open-pit to underground mining in a coal mine as an exam-ple,based on the numerical simulation software FLAC3D ,combining with the geological conditions of mining area and numerical simulation results,the stress field and displacement field of the open-pit slope and the rock overlying of the under ground mining are analyzed.The characteristics of the mechanical en-vironmental changes and the movement deformation law are summarized.During the underground mining process from the inside out,the surrounding rock stress concentration phenomenons are more likely hap-pening at the coal walls in front and after of the L working face.The slope and overlying rock of goaf mo-tion vector point at the goaf,so that,the slope angle of the slope is decreased,the slope eight is re-duced,so,it is benefit to slope stability.%以某煤矿 L 工作面露天转地下开采为例，应用 FLAC3D软件进行数值模拟，结合矿区地质条件和数值模拟结果，对露天边坡和地下开采上覆岩体的应力场及位移场进行了详细分析，归纳出了 L 工作面煤矿在露天转入地下开采时围岩的力学环境变化特点和移动变形规律。在从里向外的地下开采过程中，工作面前后煤壁及周围岩体更易发生应力集中，边坡和采空区上覆岩体的移动矢量指向采空区，使边坡角减小，坡高降低，有利于边坡稳定。