天然软黏土主应力轴循环旋转塑性效应的本构模拟  

Constitutive modeling of plastic effects of cyclic principal stress rotation of natural soft clay

作　　者：杜子博 钱建固[2,3] 郭院成[1] 黄茂松[2,3] DU Zi-bo;QIAN Jian-gu;GUO Yuan-cheng;HUANG Mao-song(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China)

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]同济大学地下建筑与工程系,上海200092 [3]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩土工程学报》2022年第8期1493-1501,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51908513,52178345);河南省重点研发与推广专项项目(212102310279);河南省博士后科研项目(202001017)。

摘　　要：在考虑各向异性边界面模型的基础上,建立了可反映天然软黏土主应力轴循环旋转塑性效应的本构模型。对于主应力轴循环旋转卸载条件,通过引入可移动映射法则,处理这种卸载情况下的塑性变形。通过考虑固有各向异性弹性,描述主应力轴循环旋转下循环波动的塑性累积行为。同时,通过考虑应力比影响并将非共轴流动和共轴流动耦合起来,模拟循环过程中非共轴性变化。对温州天然软黏土在纯主应力轴循环旋转下的不排水行为进行了模拟,结果表明,所建立的边界面模型可有效模拟天然软黏土主应力轴循环旋转下塑性效应。A constitutive model which can reflect the plastic effects of the principal stress rotation of natural soft clay is proposed based on the anisotropic bounding surface model. For the unloading conditions of the cyclic principal stress rotation,the mapping rules of relocatable projection center is incorporated to deal with the plastic deformation under these unloading conditions. The plastic accumulation behavior with a cyclic fluctuation pattern is described reasonably by incorporating the inherent anisotropic elasticity. Meanwhile, the non-coaxiality variation during cyclic rotation is simulated by considering the influences of stress ratio and coupling the non-coaxial flow with coaxial flow. The proposed model is validated through the undrained behaviors tests under the pure principal stress rotation of Wenzhou natural soft clay. The results show that the proposed bounding surface model can reasonably capture the deformation effects of the cyclic principal stress rotation of natural soft clay.

关 键 词：天然软黏土 主应力轴旋转 非共轴 各向异性弹性 边界面模型 

分 类 号：TU435[建筑科学—岩土工程]