土的三维弹黏塑性应力路径本构模型

doi:10.13722/j.cnki.jrme.2016.1298

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Abstract

Based on the isotropic compression law of soil，the total deformation of soil is divided into instantaneous and time delayed. Referring to the calculation methods for instantaneous and delayed compression of united hardening(UH) model，an one-dimensional elastic-viscous-plastic(EVP) constitutive model is developed. On the basis of an elastic plastic(EP) constitutive model for soil considering the stress paths dependency， influences of over consolidated ratio(OCR) and shear stress ratio on instant compression are considered；the delayed compression law under isotropic condition is extended to three-dimensional stress state by combining with overstress theory and plastic potential function of the modified Cam-clay model. Then a calculation method for instant and delayed compression under three dimensional stress state is proposed，meanwhile a 3D EVP model is built. The new model contains 7 material parameters，physical significances and determination of parameters have been analyzed and given. Comparisons between model predictions and experimental results show the 3D model can describe viscosity properties of clay and sand reasonably under not only conventional stress path，but also typical stress paths of stress ratio loading under excavation.

Key words： soil mechanics elastic-viscous-plastic stress path creep strain rate effect constitutive model

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	Articles by authors
	LU Dechun
	MIAO Jinbo
	LIN Qingtao
	DU Xiuli

Cite this article:

LU Dechun,MIAO Jinbo,LIN Qingtao, et al. A three-dimensional elastic-viscous-plastic model for soils considering the stress path dependency[J]. , 2018, 37(S1): 3633-3644.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.1298 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3633

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