应力水平影响下的软土边界面模型研究  

Bounding surface model effected by stress level for cyclic behavior of soft clay

作　　者：于雷 王建华[3] 王广原[1,2] YU Lei;WANG Jianhua;WANG Guangyuan(Tianjin Survey and Design Institute for Water Transport Engineering,Tianjin 300456;State Key Laboratry of Hydraulic Engineering Simulation and Safety,Tianjin 300072)

机构地区：[1]交通运输部天津水运工程科学研究所,天津300456 [2]天津水运工程勘察设计院,天津300456 [3]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《矿产勘查》2020年第4期818-825,共8页Mineral Exploration

基　　金：交通运输部天津水运工程科学研究所中央级公益性科研院所基本科研业务(编号:TKS170214)资助。

摘　　要：针对饱和软粘土在固结不排水条件下受到循环荷载作用时的应力应变响应,采用剑桥模型屈服面,可移动的映射中心,参数意义明确的塑性模量插值函数,建立了一个简单有效的弹塑性边界面本构模型。特别是针对一般边界面模型中参数难以确定的问题,通过将模型参数与应力水平建立函数关系,较好地得到了参数的确定方法。最后通过预测不同应力水平作用下的三轴压缩和拉伸试验,验证了模型的合理性。For stress-strain properties of saturated soft clay under cyclic loading on consolidated undrained condition, a simple and effective elasto-plastic bounding surface constitutive model is formulated, which introduces the yielding surface of Cam Clay model, the mobile mapping center, and a new interpolation function whose parameters have clear meaning. Especially, for the question of determining the parameters hardly in general bounding surface models, a function is builded between model parameters and stress level. In the end, the results of the model simulations give an encouraging agreement with the experiment dates from triaxial compression and tensile tests subjected to different stress level cycle loading conditions.

关 键 词：软粘土 循环荷载 边界面模型 模型参数 应力水平 海洋工程地质 

分 类 号：TU443[建筑科学—岩土工程]