软弱夹层对某矿山边坡稳定性的影响分析  

Analysis of the Influence of Weak Interlayer on the Stability of the Mine Slope

作　　者：范昊 肖诗荣[1] 魏瑞琦 张浪 FAN Hao;XIAO Shirong;WEI Ruiqi;ZHANG Lang(College of Civil Engineering&Architecture,China Three Gorges Univ.,Yichang 443002,China)

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2022年第1期54-59,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金项目(41272310)。

摘　　要：软弱结构面对边坡稳定往往存在控制作用,为探究软弱夹层对矿山边坡稳定性的影响,本文以塘垭石灰岩矿山为例,利用工程地质分析和颗粒离散元软件MatDEM对比分析了含软弱夹层和不含软弱夹层两种不同的边坡模型分步开挖的影响情况.工程地质分析表明:软弱夹层的作用使边坡产生不利块体从而形成底滑面,造成边坡平台下沉滑移、岩体滑落等失稳变形现象.数值分析表明:在含有软弱夹层的情况下,x方向最大位移为0.025m,最大增幅为140%;总位移量最大为0.045m,最大增幅为150%.在无软弱夹层的情况下,x方向最大位移为0.011m,总位移最大为0.018m.说明分步开挖会在软弱面处产生大量的位移集中现象;热量云图表明:在含有软弱夹层的情况下,软弱面附近会形成明显的红色带状高热量区,高热量带依附于软弱面并伴随着坡面的开挖向前扩展;研究表明软弱夹层的存在会对边坡开挖的稳定性产生较大的影响.The weak structure often has a controlling effect on the stability of the slope.In order to explore the influence of weak interlayer on the stability of mine slope,taking Tangya limestone mine as an example,this paper used engineering geological analysis and particle discrete element software MatDEM to compare and analyze the influence of step excavation of two different slope models with and without weak interlayer.Engineering geological analysis shows that the action of weak interlayer makes the slope produce unfavorable blocks to form bottom sliding surface,resulting in slope platform subsidence sliding,rock mass sliding and other instability deformation phenomenon.The numerical analysis shows that,in the case of weak interlayer,the maximum displacement in the x direction is 0.025 m,and the maximum increase is 140%;the maximum total displacement was 0.045 m,and the maximum increase was 150%.Without weak interlayer,the maximum displacement in x direction is 0.011 m,and the maximum total displacement is 0.018 m.It indicates that step-by-step excavation will produce a large number of displacement concentration phenomena at the weak surface.The heat cloud diagram shows that in the case of weak interlayer,there will be an obvious red banded high heat area near the weak surface.The high heat zone is attached to the weak surface and expands forward with the excavation of the slope.The study also shows that the existence of weak interlayer has great influence on the stability of slope excavation.

关 键 词：软弱夹层 块体 MatDEM 开挖 边坡稳定性 

分 类 号：P642.22[天文地球—工程地质学] TU43[天文地球—地质矿产勘探]