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  2021, Vol. 40 Issue (3): 619-628    DOI: 10.13722/j.cnki.jrme.2020.0610
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An equivalent plastic work hardening model for clay based on the egg-shaped yield function
JIANG Jiaqi1,2,XU Riqing1,2,YU Jianlin1,2,CHEN Wenxiang3#br#
(1. Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China;   2. Engineering Research Center of Urban Underground Space Development of Zhejiang Province,Hangzhou,Zhejiang 310058,China;3. Hongrun Construction Group Company Limited by Shares,Hangzhou,Zhejiang 310000,China)
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Abstract  To better understand the hardening law of soils under different loading paths,a series of stress-path drained triaxial tests for clay are carried out. The results show that the plastic work Wp exhibits a significant dependence on the stress path and hence is not suitable to be chosen as the hardening parameter. The equivalent plastic workis introduced to eliminate this stress-path dependence,and then a generalized hardening model within the framework of egg-shaped yield function is proposed. In this model,the equivalent plastic work function is employed as the hardening parameter,and the equivalent hardening parameter is normalized referring to the concept of critical state line or Hvorslev line. It is found that the correspondence between the normalized equivalent hardening parameter and the equivalent plastic work is independent of the loading path and only relative to the stress state at initial hardening(represented by the stress ratio h0). Consequently,equivalent plastic work hardening functions applicable for strain hardening/softening model,only dependent on the initial hardening stress ratio η0,are established. Finally,comparisons between numerical and test results show that the proposed hardening model can effectively reflect the stress-strain characteristics of clay under different stress paths.
Key wordssoil mechanics      generalized hardening function      equivalent plastic work      stress path      egg-shaped yield model
     
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JIANG Jiaqi1
2
XU Riqing1
2
YU Jianlin1
2
CHEN Wenxiang3
Cite this article:   
JIANG Jiaqi1,2,XU Riqing1, et al. An equivalent plastic work hardening model for clay based on the egg-shaped yield function[J]. , 2021, 40(3): 619-628.
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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0610      OR      http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I3/619
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