考虑塑性体积应变的扰动状态本构模型改进  

Improving the Disturbance State Constitutive Model by Considering Plastic Volumetric Strain

作　　者：崔允亮[1] 项鹏飞 王新泉[1] 张世民[1] CUI Yunliang1, XIANG Pengfei1,2 , WANG Xinquan1 , ZHANG Shimin1(1. Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015,China; 2. School of Civil Engineering and Architecture, Anhui University of Science and Technology,Huainan 232000, Chin)

机构地区：[1]浙江大学城市学院土木工程系,浙江杭州310015 [2]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《郑州大学学报（工学版）》2018年第1期47-52,共6页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(51508507);浙江省自然科学基金资助项目(LQ16E080007);浙江省教育厅科研项目(Y201533738)

摘　　要：针对Desai等人提出的扰动状态本构模型只考虑了塑性偏应变对扰动状态的影响,而没有考虑塑性体积应变的影响,对其扰动状态本构模型的扰动函数进行改进,在原扰动函数的基础上引入一个塑性偏应变迹和塑性体积应变迹的耦合形式作为扰动函数的扰动变量.取温州原状结构性软土进行了三轴固结不排水(CU)压缩试验、三轴固结排水(CD)压缩试验和一维压缩试验,通过试验数据对改进了扰动函数的DSC本构模型进行了验证.结果表明,改进前模型对原状结构性软土的不排水强度和排水强度预测均略偏高,改进后的模型对原状结构性软土应力应变关系的模拟精确.The disturbed state constitutive（ DSC） model,proposed by Desai only considered the affect of plastic deviatoric strain on disturbance state,without considering the plastic volumetric strain. The disturbance function of the disturbed state constitutive（ DSC） model was improved by introducing a coupling-form disturbance variable of plastic deviatoric stain trace and plastic volumetric strain trace on the basis of the original disturbance function. Triaxial consolidated undrained（ CU） test,triaxial consolidated drained（ CD） test and one dimensional compression test were performed on the wenzhou natural structured soft clay. The DSC constitutive model with the improved disturbance function was validated by the test data. The validation results showed that the unimproved model predictsed a slightly higher strength of both undrained and drained test of the natural structured soft clay,and the prediction of the improved model was more accurate.

关 键 词：扰动状态 塑性体积应变 塑性偏应变 本构模型 扰动函数 

分 类 号：TU470[建筑科学—结构工程]