粉质粘土结构性参数试验研究  

Experimental research on the structure parameter of silty clay

作　　者：刘家顺 王来贵[2] 张向东 李旭盈 赖鹏安 

机构地区：[1]辽宁工程技术大学土木工程学院,阜新123000 [2]辽宁工程技术大学力学与工程学院,阜新123000 [3]辽宁工程技术大学国家大学科技园,阜新123000

出　　处：《应用力学学报》2018年第4期911-917,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50978131);高等学校博士学科点专项科研基金项目(20112121110004)

摘　　要：为合理描述外部环境改变引起土体结构性的变化规律,基于综合结构势理论,通过三轴剪切试验,研究了应力比结构性参数(mη)随试验条件的变化规律。试验结果表明:粉质粘土应力-应变曲线包括应变软化型曲线、理想弹塑性曲线、应变硬化型曲线3种形式;粉质粘土强度随着含水量的增大而减小,随着围压的增大而增大。粉质粘土应力比结构性参数随着含水率和围压的增大而减小。采用初始应力比结构性参数和结构性损伤量参数两个参数,建立了粉质粘土结构性应力-应变数学模型。将试验结果与模型计算结果进行了对比分析,结果表明二者强度误差小于3%,说明了所建立模型的合理性。The stress ratio structure parameter of silty clay is proposed based on the comprehensive structure potential theory to describe the structure change which caused by external environment change. The stress ratio structure parameter change law of silty clay is studied according to lots of consolidated drained triaxial tests under different confining pressures and moisture contents. The tests results show that the σ1-σ3 versus ε1 curves include strain softening type, ideal elastic-plastic type and strain hardening type. The silty clay strength decreases with the increasing of moisture contents and confining pressures. The initial stress ratio structure parameters and structure damage parameters are proposed and then the structure mathematical model between deviatoric stress and axial strain of silty clay is established with the consideration of both the initial stress ratio structure parameters and structure damage parameters. The test results and the model calculation results are compared and analyzed, and the model is proved to be rational.

关 键 词：土力学 综合结构势 粉质粘土 应力比结构性参数 结构性应力-应变数学模型 

分 类 号：TU435[建筑科学—岩土工程]