布沼坝露天矿西帮软岩边坡变形机理研究

Study on deformation mechanism of soft rock slope in west slope of Buzhaoba Open-pit Mine

以布沼坝露天矿西帮软岩边坡为研究对象,结合相关地质资料,建立三维模型;利用FLAC3D软件采用强度折减法对布沼坝露天矿西帮软岩边坡局部台阶滑塌机理进行研究,根据滑塌前监测数据及降雨量数据对比分析,进一步明确变形原因;同时还介绍了露天矿西帮软岩边坡变形处置措施。研究表明:降雨是导致此次边坡变形的主要诱导因素,变形主要位于边坡临空面浅层,应力分布基本平行于斜坡面,且拉应力与压应力分别集中于坡顶与坡脚,为推移式变形,与实际表现出的后缘沉降、前缘隆起的变形特征一致。

Taking west slope soft rock slope of Buzhaoba Open-pit Mine as the research object,combined with the relevant geological data,a three-dimensional model was established,and the strength reduction method was used to study the local step slip mechanism of west slope soft rock slope of the Buzhaoba Open-pit Mine using FLAC3D software.According to the comparative analysis of the monitoring data and rainfall data before the landslide,the cause of the deformation was further clarified.At the same time,the basic process of deformation and disposal of soft rock slope in the west slope of the open-pit mine is introduced.The results show that rainfall is the main inducing factor of the slope deformation,the deformation is mainly located in the shallow layer of the slope free surface,the stress distribution is basically parallel to the slope surface,and the tensile stress and compressive stress are concentrated at the top and foot of the slope respectively,which is a push-type deformation and is consistent with the actual deformation characteristics of trailing edge settlement and leading edge uplift.