一种基于蛋形屈服函数的黏土等效塑性功硬化模型

doi:10.13722/j.cnki.jrme.2020.0610

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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 words： soil mechanics generalized hardening function equivalent plastic work stress path egg-shaped yield model

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	Articles by authors
	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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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0610 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I3/619

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