摘要
为了研究露天矿边坡合理的形态参数问题,以黑山露天矿南帮边坡为例,基于简化Bishop法的二维边坡稳定计算与三维强度折减法的数值模拟研究,优化了边坡的形态参数,分析了边坡的破坏机理与形变原因,探究了测点位移与形变量的变化关系。研究结果表明:圆弧滑动为南帮最危险的滑坡模式,边坡发生变形破坏的力学特征符合推动式滑坡的定义,靠近临空面处的应力分布不连续与应力集中现象是边坡破坏的内在原因,其受控于边坡岩土体的物理力学指标,工作帮与内排土场对南帮边坡产生的支挡效应明显,可显著提高坡面靠坡脚一侧区段的稳定性,南帮边坡在受到工作帮与排土场支挡的同时,也会挤压工作帮与排土场并造成一定程度的底鼓;在滑移量最大区域,考虑三维支挡效应,比选了二维分析方法取得的初步结论,以模型临界失稳前的测点位移增长速率为度量,可进一步优化边坡形态参数。
In order to study the reasonable shape parameters of the open-pit mine slope,taking the south slope of Heishan Open-pit Mine as an example,based on the simplified Bishop method for two-dimensional slope stability calculation and the three-dimensional strength reduction method for numerical simulation,the shape parameters of the slope were optimized,the failure mechanism and deformation reasons of the slope were analyzed,and the change relationship between the displacement of the measuring point and the shape variable was explored.The research results show that arc sliding is the most dangerous landslide mode in the south side,the mechanical characteristics of slope deformation and failure conform to the definition of push type landslide,and the discontinuous stress distribution and stress concentration near the free face are the internal causes of slope failure,which are controlled by the physical and mechanical indexes of the slope rock and soil mass.The retaining effect of the working slope and the internal waste dump on the southern slope is obvious,which can significantly improve the stability of the section near the slope toe.While the southern slope is supported by the working slope and the waste dump,it will also squeeze the working slope and the waste dump and cause a certain degree of floor heave.In the area with the maximum slip,considering the three-dimensional retaining effect,the preliminary conclusions obtained by the two-dimensional analysis method are compared and selected.The slope shape parameters can be further optimized by measuring the displacement growth rate of the measuring point before the critical instability of the model.
作者
郭海建
成功
GUO Haijian;CHENG Gong(China Coal Technology and Engineering Group Shenyang Research Institute,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China;Xinjiang Coal Design and Research Institute Co.,Ltd.,Urumqi 830091,China)
出处
《露天采矿技术》
CAS
2023年第2期42-45,49,共5页
Opencast Mining Technology
关键词
强度折减法
数值模拟
破坏机理
滑坡模式
支挡效应
strength reduction method
numerical simulation
failure mechanism
landslide mode
support effect
