露采矿山台阶边坡结构面特性与破坏机制分析

Structural planes characteristics and failure mechanism for open-pit mining bench slope

基于四川峨胜露天矿山台阶边坡的结构面特征,结合离散单元软件3DEC对台阶边坡进行模拟,研究台阶边坡破坏机制。结果表明:(1)受区域地质构造影响,研究区域的优势结构面倾角较陡,且产状与构造迹线相关;(2)矿区台阶边坡变形破坏模式主要为平面滑动和楔形体破坏,发生倾倒破坏的可能性小;(3)边坡整体变形小,在结构面贯穿的位置有位移突变和增大的现象,临空面的楔形体出露后发生崩塌掉块,局部稳定性降低;(4)台阶边坡破坏机制为拉裂-滑移-崩塌,可分为三个阶段:弹性变形阶段,渐进变形阶段和变形破坏阶段。

Based on the characteristic parameters in an open-pit mine in ESheng Sichuan province,the slope failure criterion was analyzed using the discrete element software 3DEC,the results of which are as follows：（ 1） Due to the influence of regional geological structure,the dominant structural plane of the study area was steep,and the occurrence was related to the structural trace;（ 2） The failure mode of the bench slope in the mining area was mainly plane sliding and wedge failure,and the probability of occurrence of dumping failure was small.（ 3） The deformation of the slope was small,and the displacement and the increase of the displacement were obvious in the position where the structure plane penetrated. The wedge of the freeing face collapsed and the local stability decreased;（ 4） The failure mechanism of bench slope was pull crack-slidingcollapse,which can be divided into three stages： elastic deformation stage,progressive deformation stage and deformation failure stage.