柳家凹黄土滑坡滑动机制研究  

Study of sliding mechanism of Liujiaao loess landslide

作　　者：姚海林[1] 游慧杰[1] 范永丰[2,3] 刘军 李正强 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [2]郑州大学水利与环境学院,河南郑州450001 [3]河南弘卢高速公路有限公司,河南灵宝472532

出　　处：《岩土力学》2013年第1期182-188,共7页Rock and Soil Mechanics

基　　金：西部交通建设科技项目(No.2011318775680;No.200831822312);岩土力学与工程国家重点实验室重点项目(特殊土与地基基础专项)

摘　　要：以豫西山区柳家凹黄土滑坡为研究对象,采用现场地质勘探和调绘的方法确定了滑坡的形态和性质;利用原位试验和室内试验确定了滑带土的强度衰减的影响因素和影响规律;采用现场监测等技术手段,确定了滑动深度。在此基础上,分析了柳家凹滑坡的活动历史、成因、范围和影响因素。调查和分析表明,柳家凹黄土滑坡的滑动机制可概括为古滑坡因路堑开挖和降雨而局部复活。古滑坡黄土体结构相对松散,抗剪强度较差。当古滑坡前缘土体被开挖后,古滑体失去前缘支挡,在自重应力和地下水共同作用下,古滑坡体前缘沿黄土层与砾石层交接面滑动带滑移破坏。根据古滑坡复活情况分析,柳家凹黄土滑坡为牵引式滑坡,当滑体前缘滑动后,后面的滑体陆续出现滑动,裂缝向纵深方向发展。The field geological exploration and survey are used to determine the form and property of Liujiaao loess landslide;in the western mountainous area of Henan province in-situ test and laboratory test are used to determine the influence factors and weakening law of strength of sliding zone soil;field monitoring are used to determine sliding depth.The activity history,formation causes,range and influence factors of Liujiaao loess landslide are analysed based on investigation and tests.Survey and analysis results show that,the sliding mechanism of Liujiaao loess landslide can be summarized as local ancient landslide revives caused by excavation of cutting and rainfall.For ancient landslide,the loess mass structure is relatively loose and shear strength is poor.When the front soil of ancient landslide is cut,ancient landslide loses the front supporting and retaining,and then the front of ancient landslide slips and failures along the sliding zone of interface of loess layer and gravel layer under the interaction of gravity stress and groundwater.According to the analysis of ancient landslide revival,Liujiaao loess landslide is pull-type landslide.After the front of ancient landslide sliding,the latter can slide successively and the crack develops in depth.

关 键 词：黄土滑坡 原位直剪试验 现场监测 滑动破坏机制 滑带土 稳定性 

分 类 号：TU411[建筑科学—岩土工程]