破碎泥岩颗粒与钢护筒接触面往复剪切特性试验研究  

Reciprocating Shear Characteristics of Contact Interface Between Broken Mudstone and Steel Casing

作　　者：梁越[1,2,3] 刘泽宇[1,3] 张强[1,3] 袁野[1,3] 

机构地区：[1]重庆交通大学国家内河航道整治工程技术研究中心,重庆400074 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [3]重庆交通大学水利水运工程教育部重点实验室,重庆400074

出　　处：《重庆交通大学学报（自然科学版）》2016年第4期60-64,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(51409029;51349007);重庆市教委科学技术研究项目(KJ130412);重庆市基础与前沿研究计划项目(estc2013jcyj A30006);河海大学岩土力学与堤坝工程教育部重点实验室开放基金项目(GH201303)

摘　　要：通过改进的室内直剪仪,控制试样颗粒级配、干密度、含水率等,研究钢-土接触面剪切特性在不同往复剪切圈数下的变化情况。分别在法向应力100,200,300,400 k Pa条件下,记录不同剪切圈数下剪应力和法向位移的变化情况,引入摩尔-库伦准则分析了剪应力位移关系曲线、极限剪应力以及法向位移随往复剪切圈数的变化规律,发现剪应力位移关系曲线呈先急剧上升后趋于稳定的现象;随着往复剪切圈数的增加,极限剪应力和法向位移均有逐渐减小的趋势,且在一定的剪切圈数后趋于稳定;黏结力随剪切圈数的增加表现为先增大后减小最后趋于稳定,而内摩擦角则逐渐减小并趋于稳定。The change of shear characteristics of steel-soil contact interface with different cyclic shear cycles was studied by improving the indoor direct shear apparatus and controlling the graduation, dry density, moisture content and so on. The change of shear stress and normal displacement with different shear cycles was recorded respectively under normal stress from 100, 200, 300 kPa to 400 kPa. The relation curve between shear stress and displacement, the ultimate shearing stress and the rule of normal displacement changing with cyclic shear cycles were analyzed by the introduction Mohr-Coulomb failure criterion. It is discovered that： a） the relationship curve between shear stress and displacement is found to be stable after a sharp rise; b） both the ultimate shearing stress and the normal displacement have a gradual decrease trend with the increase of the number of cyclic shear cycles, and intend to be stable at a certain number of shear cycles; c） with the increase of the number of cyclic shear cycles, the cohesive force firstly increases, and then gradually decreases, and tends to be stable finally; and the internal friction angle tends to be stable after a gradual decrease.

关 键 词：岩土工程 破碎泥岩 钢-土界面 往复剪切 剪切特性 

分 类 号：TU432[建筑科学—岩土工程]