三峡库区某滑坡滑带土试验研究  

A Slip Zone Soil Test of a Landslide in the Three Gorges Reservoir Area

作　　者：汤罗圣[1] 殷坤龙[2] 李远耀[2] 缪海波[2] 刘艺梁[2] 

机构地区：[1]湖北省交通规划设计院,武汉430074 [2]中国地质大学(武汉)工程学院,武汉430074

出　　处：《地下空间与工程学报》2013年第6期1242-1247,1256,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(No.40872176);中央高校基本科研业务费专项资金优秀青年教师基金(CUGL100213);教育部长江三峡库区地质灾害研究中心开放基金(TGRC2010121)

摘　　要：滑坡滑带土试验是确定滑坡物理力学参数的主要方法之一,是研究滑坡成因机理的基础,但由于人为和试验仪器本身等方面的原因,导致滑坡滑带土试验成果失真,因此非常有必要对滑坡滑带土试验成果进行检验。本文采用室内试验对三峡库区某滑坡滑带土的含水率、液塑限、颗粒级配、自由膨胀率进行了研究,在此基础上结合滑坡实际情况,运用反复剪切试验重点对滑带土的残余强度参数进行了探讨,最后采用区域统计规律对试验成果进行了检验。研究结果表明:该滑坡滑带土为级配良好的粘土,其天然含水率为31.21%,且该滑带为弱膨胀性土;滑带土达到残余强度的剪切位移与垂直压力成正比;该滑坡滑带土的饱和残余强度为:c=0.29 kPa,φ=7.45°。The slip zone soil test is one of the main methods to confirm physical and mechanical parameters of the landslide, which are the foundation for studying landslide formation mechanism. However, the test results some times are not accurate due to human and instrument factors and other reasons. So it is quite necessary to verify the test results. This passage will study the moisture content, liquid plastic limit, grain size distribution and free expansion ratio of soil of a landslide in the Three Gorges Reservoir area using laboratory tests. According to the above research results, the residual strength parameters of the slip zone soil are studied by repeated shear tests. Finally, we adopt the region statistical law to verify test results. The results show that ： the slip zone soil is a low swelling clay whose gra dation is good and natural moisture content is 31.21%, the shear displacement which the slip zone soil reaches the residual strength slipping is proportional to the vertical pressure, and the saturated residual strength of the slip zone soil is： c=0.29kPa,ξ=7.45°.

关 键 词：含水率 液塑限 颗粒级配 自由膨胀率 反复剪切试验 残余强度 

分 类 号：O319.56[理学—一般力学与力学基础]