基于渗流作用下含断层的露天矿边坡稳定性的数值模拟研究  

Numerical simulation on the stability of open-pit mine slopes containing faults under seepage action

作　　者：何锋[1] 刘春学[1] HE Feng;LIU Chunxue(School of Logistics and Management Engineering,Yunnan University of Finance and Economics,Kunming 650221,China)

机构地区：[1]云南财经大学物流与管理工程学院,昆明650221

出　　处：《有色金属（矿山部分）》2024年第2期70-75,87,共7页NONFERROUS METALS(Mining Section）

基　　金：国家自然科学基金地区项目(42062020);云南省科技厅重点研发项目(202003AC100001);云南省科技厅面上项目(202101AT070562)。

摘　　要：为研究含断层露天边坡在渗流作用下的稳定性问题,采用FLAC3D数值模拟技术构建断层作用下的滑体力学模型,获得顺倾层状边坡分条稳定系数表达式,进而对渗流作用下含断层边坡稳定性进行数值模拟分析。对岩体强度的弹性模量、内聚力、内摩擦角和岩体抗拉强度等4种影响因素进行敏感性分析,通过分析这4种因素在不同工况下边坡的位移、应力、应变和安全系数,得出了各参数的敏感性分析曲线。从敏感性分析曲线可知,岩体的内聚力对边坡稳定性的影响最大,弹性模量对边坡稳定性的影响最小。开挖不同阶段边坡稳定性的主要影响因素存在差别,其中,前期以断层为主,后期则逐渐转化为渗流作用。该研究为今后露天矿边坡稳定性分析提供了科学依据,对于边坡稳定性分析具有重大的工程实际意义。To study the stability of open-air slope with fault under seepage,this paper uses FLAC3D numerical simulation technology to establish a mechanical model of the sliding body under fault action,and deduce the expression of the stability coefficient of the longitudinal slope,to simulate the stability of the slope with fault under seepage action.The results show that the sensitivity analysis is carried out on four influencing factors such as elastic modulus of rock mass strength,cohesion,internal friction Angle,and tensile strength of rock mass.By analyzing the displacement,stress,strain and safety factor of slope under different working conditions of these four factors,the sensitivity analysis curve of each parameter is obtained.It can be seen from the sensitivity analysis curve that the cohesion of rock mass has the greatest influence on the slope stability,and the elastic modulus has the least influence on the slope stability.The main influencing factors of slope stability are different at different excavation stages.In the early stage of excavation,the main factor affecting slope stability is fault,which gradually changes to seepage in the later stage.This study provides a scientific basis for the future analysis of open-pit slope stability.

关 键 词：露天矿 边坡稳定 渗流 数值模拟 安全系数 

分 类 号：TU459.2[建筑科学—岩土工程] TD854.6[建筑科学—土工工程]