地下开采引起覆岩破坏及边坡变形的数值模拟  

Numerical Simulation of Strata Failure and Slope Deformation in Underground Mining

作　　者：王振伟[1,2] 张青波[1] 刘天苹[1] 李世海[1] 

机构地区：[1]中国科学院力学研究所,北京100190 [2]煤科集团沈阳研究院有限公司,辽宁抚顺113122

出　　处：《煤矿安全》2014年第2期207-211,共5页Safety in Coal Mines

基　　金：国家重点基础研究发展计划(973计划)资助项目(2010CB731506);国家自然科学基金面上资助项目(51274122)

摘　　要：以安家岭矿区为背景，使用基于连续介质力学的离散元方法（CDEM），对地下开采引起的上覆岩层破坏及边坡变形的全过程进行了数值模拟。通过对采空区上覆岩层的竖向应力变化分析发现弯曲带与垮落带和裂隙带总厚度之比约为0．5；通过对岩层变形破坏演化过程分析得到初次垮落步距约为115～165m，采空区达到露天坡下方时，上部坡体向采空区垮落，产生张拉裂缝；边坡以层间水平错动为主，同时伴有朝向采空区的塌陷，不会直接滑坡；对比分析算例表明压脚措施可减少边坡向露天矿一侧的水平位移。Choosing Anjialing Mine as research object, the whole process of strata failure and deformation of slope in underground min- ing is simulated by continuum based discrete element method （CDEM）. The analysis of vertical stress in the overlying strata shows that the height of bending zone is haft of the total height of collapse zone and fracture zone. The first roof caving distance in the undergroun- ding mining is 115 to 156 m in this simulation. The upper slope collapsing to the mine goal and the tension crack in the open - pit slope were obtained when the mine goal area was extending to the area that is just under the open - pit slope. The deformation and failure of open - pit slope is mostly interlay movement with collapsing to the mine goal in the caving simulation. The underground mining can not cause the whole landslide directly. The pressure foot project can effectively reduce the slope movement collapsing to the open - pit mine along the interface by comparison of numerical tests.

关 键 词：地下开采 边坡变形 变形破坏 数值模拟 离散元方法 覆岩破坏 

分 类 号：TD353[矿业工程—矿井建设]