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A Simple Anisotropic Bounding Surface Model for Saturated Soft Clay Considering Degradation under Cyclic Loading
YANG Zhaohuan 1,WANG Jianhua 2 * #
1.Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300052
2. Geotechnical Engieering Institute of Tianjin University, Tianjin, 300052
*Correspondence author
#Submitted by
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Funding: National Research Foundation for the Doctoral Program of Higher Education of China （No.20130032110045）, National Natural Science Foundation of China （No.51579174）
Opened online:17 May 2017
Accepted by: none
Citation: YANG Zhaohuan,WANG Jianhua.A Simple Anisotropic Bounding Surface Model for Saturated Soft Clay Considering Degradation under Cyclic Loading[OL]. [17 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4728921
 
 
In this study, a simple elastoplastic bounding surface plasticity model accounting for the degradation of saturated soft clay under cyclic loading is developed on the base of critical state soil mechanics and the bounding surface plasticity. The associated flow rule is adopted for simplicity. A preferable rotational hardening rule proposed by Dafalias is generalized into the domain of dynamic model after comparing different kinds of rotational hardening rules to describe the development of anisotropy in soft clay. A new interpolation function of plastic modulus associated with the length of the deviatoric plastic shear strain trajectory is introduced into the model to describe cyclic degradation. Compared with the existing cyclic elastoplastic model, the amount of parameters needed in the proposed model are relative fewer. Merely 9 material parameters with robust physical meaning including 5 Modified Cam Clay model constants are required. The applicability of the constitutive to predict the saturated soft clay's response is validated by comparing the model simulation of monotonic and cyclic loading behavior under undrained conditions with experimental results. The proposed model is capable of capturing the essential features of response in saturated clay, including anisotropy and degradation.
Keywords:geotechnical engineering; soft clay; cyclic loading; cyclic degradation; deviatoric plastic strain trajectory; bounding surface plasticity
 
 
 

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