基于位移反分析的露天边坡稳定性评价  

Stability Evaluation of Open Pit Slope Based on Back Analysis of Displacement

作　　者：周亮[1,2] 

机构地区：[1]中色非洲矿业有限公司,北京100029 [2]北京科技大学土木与环境工程学院,北京100083

出　　处：《矿冶工程》2012年第5期11-14,18,共5页Mining and Metallurgical Engineering

基　　金：国家"十二五"科技支撑计划项目(2012BAB08B02);国家自然科学基金资助项目(50774011)

摘　　要：根据某矿西部贫矿开采条件,借助ANSYS和FLAC3D软件建立了大型三维数值分析模型。基于该矿边坡位移GPS监测数据,通过地表岩移反分析得到了合理的矿岩和充填体物理力学参数。数值分析表明,贫矿开采过程中露天边坡整体处于稳定状态,且贫矿开采活动对上盘南部边坡影响程度较大,其岩移量和塑性区范围变化较明显,同时贫矿开采过程中南部边坡最大主应力由压应力转变为拉应力,极易因拉应力的作用而出现掉块、局部塌落等现象,且对斜坡道入口和出入斜坡道的主运输巷道影响较为明显。According to the conditions for mining western lean ore in a mine, a large-scale three-dimensional numerical analysis model was established with ANSYS and FLAG3D. Based on the GPS monitoring data of open pit slope displacement, the rational physical and mechanical parameters of rock and backfill were obtained by back-analysis of displacement. The numerical analysis result indicated that open pit slope was overall in a stable state in the process of lean ore extraction. The slope on the south of hanging wall was significantly affected, with the displacement and plastic zone obviously changed. In addition, the maximum principal stress of south slope changed from compressive stress to tensile stress during the mining, the phenomena of rid spalling and partial roof collapse prone to be occurred due to the tensile stress, especially in the entry and main drift to the slope.

关 键 词：露天边坡 GPS监测 数值模拟 位移反分析 

分 类 号：TD32[矿业工程—矿井建设]