平庄矿压煤边坡陡帮开采三维稳定性分析  

Three-dimensional stability analysis of pingzhuang opencast coal steep slope mining

作　　者：张国锋[1,2] 解毅[1,2] 季毛伟[3] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]深部岩土力学与地下工程国家重点实验室,北京100083 [3]北京科技大学土木与环境工程学院,北京100083

出　　处：《中国矿业》2015年第9期88-92,共5页China Mining Magazine

基　　金：教育部高校博士点基金项目资助(编号:20130023120011);中央高校基本科研基金项目资助(编号:2012800015DQ)

摘　　要：平庄西露天煤矿设计采用的到界边坡角偏于保守,造成岩石剥离耗费过多,并且坡脚积压大量优质煤层。本文应用MADIS有限元程序,对西露天矿陡帮边坡压煤区不同开挖宽度的变形规律进行了分析,结果显示开挖空间的最大位移随开挖长度的增加呈现出先陡增、接着缓增、最后趋近水平的扁"S"型增长规律,并且存在一个临界开挖宽度,使得该点可以界定为两个变形差异明显的变形阶段。据此建立边坡三维变形体力学与基于刚体极限平衡分析的MSRAMA法边坡稳态分析的关系式,提出陡帮开采下边坡三维稳定性系数计算方法,并得出陡帮开采下边坡三维稳定性随压煤分步开挖宽度的变化规律,优化压煤最佳开挖宽度。在平庄西露天煤矿Ι区坡脚压煤开采时,利用三维变形效应,采取分段开挖,跟进回填,反压护坡等措施,维护了边坡稳定,取得了良好的经济社会效益。The boundary of slope angle incline to conservative in Pingzhuang West opencast mine design, resulting in peeling take too much rock and slope toe large backlog of high-quality coal. In this paper, MADIS finite element program was applied for the analysis of west surface mine of steep slope coal area deformation regularity of different excavation width. The results show that the maximum displacement of excavation space along with the increase of excavation length shows first increased sharply, then slowly increasing,then finally reaching the level of flat ＂S＂ type growth law, and there is a critical excavation width, so that the point can be defined as two deformation difference obvious deformation stage. Accordingly establishing three-dimensional slope deformation mechanics and based on the limit equilibrium analysis of MSRAMA law of slope stability analysis relationship, the paper puts forward under the mining of steep slope three-dimensional slope stability coefficient calculation method, and draws steep slope mining excavation by steps the law of three-dimensional stability variation and the optimum of excavation width. This new computational method was successfully applied to the slope in Pingzhuang west opencast mine, obtaining a technical, economic,and social benefit.

关 键 词：露天煤矿 边坡工程 陡帮开采 三维变形效应 稳定系数 

分 类 号：TD85[矿业工程—金属矿开采]