考虑胶结退化的水泥土边界面模型及参数研究  

Bounding Surface Model and Parameters Study on Describing the Behavior of Cement-treated Clay with Cementation Degradation

作　　者：闫富有[1] 崔昊 李俊超 郜新军[1] YAN Fuyou;CUI Hao;LI Junchao;GAO Xinjun(School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China;School of Civil Engineering, Chongqing University, Chongqing 400044, China)

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]重庆大学土木工程学院,重庆400044

出　　处：《郑州大学学报（工学版）》2021年第1期63-69,共7页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(52078469)。

摘　　要：基于修正平均有效应力的方法,对水泥固化土的胶结作用和剪切过程的胶结退化现象进行描述。除少部分参数需要借助于其他绘图软件外,多数均可通过程序计算拟合。在此基础上,建立考虑胶结作用和胶结退化现象的水泥固化土双面边界面本构模型,模型基本参数采用最小二乘法,由固结不排水剪切试验结果的偏应力-偏应变曲线拟合得到。通过对不同种类、不同水泥掺量的水泥固化土,在不同围压下固结不排水剪切试验的模拟与试验结果比较,显示出所建模型和参数拟合方法的可靠性与正确性。最后,为了进一步说明该模型与方法的作用,给出了循环荷载作用下固结不排水剪切试验的模拟算例,表明数值结果可揭示循环荷载作用下水泥固化土的应力、超孔隙水压力及应力路径等主要应力-应变特征。Based on the concept of modified mean effective stress,the effect of cementitious bonding and the loss of bonding during loading for cement-treated clay were described,in which most of the parameters could be got automatically by program calculation except for a few parameters estimated by other software.And then,the bounding surface model with two surfaces was developed in order to describe the behaviour of cementation and cementation degradation of cement-treated clay,and the basic model parameters were selected in the deviator strain and deviator stress plane from undrained shear tests.The reliability and correctness of the proposed constitutive model and their parametric estimation methods were shown by comparing the simulation and test results of the undrained shear tests from the literature under different confining pressure for different kinds and different cement contents cement-treated clay.Finally,to further illustrate the advantages of the proposed model,a numerical example was conducted on triaxial undrained shear test under cyclic loading condition for cement-treated clay,and the results showed that it could reveal the main stress-strain characteristics of cement-treated clay such as stress,excess pore water pressure and stress path and so on under cyclic loading condition.

关 键 词：水泥固化土 胶结退化 边界面模型 参数估计 

分 类 号：TU43[建筑科学—岩土工程]