An Elastic-Viscoplastic Model for Time-Dependent Behavior of Soft Clay and Its Application on Rheological ConsolidationReport as inadecuate

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Mathematical Problems in Engineering - Volume 2014 2014, Article ID 587412, 14 pages -

Research Article

Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China

Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China

Zhejiang Provincial Institute of Communications Planning, Design & Research, Hangzhou 310006, China

Received 10 February 2014; Accepted 12 May 2014; Published 5 June 2014

Academic Editor: Gradimir Milovanović

Copyright © 2014 Jinzhu Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


To describe the time-dependent behavior of soft clay, this paper extended one-dimensional Nishihara model to three-dimensional stress state based on the framework of Perzyna’s overstress theory and modified cam-clay model. The yield criterion of modified cam-clay model was used to describe the plastic properties of soft clay, and the overstress theory was used to describe the strain rate effect. Triaxial rheological tests were carried out on Ningbo soft clay and the rheological characteristics were studied. Based on laboratory results, the parameters of proposed model were determined by curve fitting, which show that this model is suitable for the rheological characteristics of Ningbo soft clay. The analysis of parameters shows that, the value of parameters changes slightly with different deviatoric stress when the confining pressure was constant, but changes notably with the increase of confining pressure. A user material subroutine of the proposed constitutive mode was coded on the platform of the FEM software ABAQUS and verified by triaxial compression of soil column. A plain strain problem was computed to analyze the rheological consolidation properties of soft clay, in which the rheological effect and the finite strain effect were considered.

Author: Jinzhu Li, Wenjun Wang, Yijun Zhu, Haofeng Xu, and Xinyu Xie



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