三峡库区滑带土抗剪强度参数的统计规律研究  

Study on statistical rule of shear strength parameters of soil in landslide zone in Three Gorges Reservoir area

作　　者：李远耀[1] 殷坤龙[1] 柴波[1] 张桂荣[1] 

机构地区：[1]中国地质大学工程学院,武汉430074

出　　处：《岩土力学》2008年第5期1419-1424,1429,共7页Rock and Soil Mechanics

基　　金：教育部高校博士点基金资助项目(No.20030491004)

摘　　要：收集和整理了近年来三峡库区地质灾害防治工程中近400处滑坡的勘察资料,采用地质分析和工程地质类比法,指出三峡库区内存在5类易滑地层。运用K-S有限比较法,对3 308组抗剪强度参数试验数据分类进行了拟合优度检验,发现5类易滑地层中滑坡滑带土的c、φ值一般均能接受正态和对数正态分布,但c值与φ值相比,最优分布服从对数正态分布者更多,而服从正态分布者更少。针对区内滑带土普遍含有碎石的显著特点,对φ值与碎石含量的相关关系进行了线性回归分析发现滑带土φ值与含石量呈现良好的正相关关系。Data about 400 landslides in Three-George reservoir area were collected and summarized in recent years. It is concluded that there are five types of sliding-prone strata in reservoir area on the basis of geologic analysis and engineering geology analogy analysis. Through K-S finite contrast method, test of goodness of fit was respectively carried out on 3 308 groups of shear strength parameters; and the results showed that distribution forms of parameters c and φ are normal distribution and logarithmic normal distribution. The optimum fits of probabilistic models of c are mainly logarithmic normal distribution. As there are gravels in soil in landslide zone, linear regression analysis was carried out between the gravel content and the parameter φ of soil in landslide zone and the results indicated a well positive correlation relationship.

关 键 词：三峡库区 易滑地层 滑带土 抗剪强度参数 最优分布 

分 类 号：TU432[建筑科学—岩土工程]