凹陷露天矿内排土护坡体破坏模式及关键参数  

Failure Mode and Key Parameters of Slope Protection by Dumping in Sunken Open Pit Mine

作　　者：姜立春[1] 王格格 JIANG Lichun;WANG Gege(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;Institute of Safety Science and Engineering,South China University of Technology,Guangzhou 510640,China;Guangdong Provincial Science and Technology Collaborative Innovation Center for Work Safety,Guangzhou 510640,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]华南理工大学安全科学与工程研究所,广东广州510640 [3]广东省安全生产科技协同创新中心,广东广州510640

出　　处：《湖南科技大学学报（自然科学版）》2023年第1期9-18,共10页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(51974135)。

摘　　要：根据瑞典圆弧法积分求解原理,结合护坡体结构特征,判断护坡体破坏模式并推导其安全系数表达式,分析台阶高度h、平台宽度d以及台阶坡面角β等对护坡体安全系数F_(s)的影响规律及影响程度.通过护坡体数值模拟结果,分析护坡体的位移变化规律以及潜在滑移面特征,并判断其破坏特征.研究结果表明:护坡体的破坏模式是以土体-块石交界面为底界面,以土体圆弧为侧界面的顺层圆弧滑动.随着护坡体台阶高度与台阶坡面角增大,其安全系数减小,最大位移量与应变量增大;随着护坡体平台宽度增大,其安全系数增大,最大位移量与应变量减小.台阶坡面角是影响护坡体安全系数与最大位移量的关键结构参数.According to the integral solution principle of Swedish arc method,combined with the structural characteristics of slope protection body,the failure mode of slope protection body is judged and its safety factor expression is deduced.The influence law and degree of structural parameters of slope protection body,such as step height h,platform width d and step slope angleβ,on the safety factor F,of slope protection body are analyzed.Based on the numerical simulation results of slope protection,the displacement variation law and potential slip surface characteristics of slope protection are analyzed,and the failure characteristics are judged.Results show that the failure mode of slope protection body is bedding circular arc sliding with the interface between soil and rock as the bottom interface and the soil circular arc as the side interface.With the increase of step height and slope angle,the safety factor decreases,and the maximum displacement and strain increase.With the increase of platform width,the safety factor increases and the maximum displacement and strain decrease.Step slope angle is the key structural parameter that affects the safety factor and maximum displacement of slope protection.

关 键 词：凹陷露天矿 内排土 护坡体 结构参数 数值模拟 

分 类 号：TD771[矿业工程—矿井通风与安全]