膨胀性非饱和土本构模型的隐式和显式积分算法的比较

doi:10.13722/j.cnki.jrme.2018.0055

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Abstract Comparative studies on the accuracy and convergence of implicit and explicit integration schemes of a constitutive model for unsaturated expansive clays are conducted. The differences and interactions between mechanical and water retention behaviours of macrostructure and microstructure are considered in the model. The model is rather complex due to the adoption of bounding surface theory，multi-plastic mechanism，multiple hardening parameters，coupling hardening law，etc. Based on the Euler forward method，an explicit integration scheme combining an automatic sub-stepping scheme with a method to determine the number of active plastic mechanisms is proposed. Comparisons on the accuracy and convergence of the explicit integration scheme and existing implicit integration scheme are carried out according to the calculated results with different strain increment size on control-strain tests，which provides a basis for selecting the stress integration scheme of complex models.

Key words： soil mechanics unsaturated soils double structure multi-plastic mechanism implicit integration scheme explicit integration scheme

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	Articles by authors
	LI Jian1
	2
	WANG Pengyue1
	2
	HAI Lu1
	2
	ZHU Yanhua1
	2
	CAI Guoqing1
	2

Cite this article:

LI Jian1,2,WANG Pengyue1, et al. Implicit and explicit integration schemes of a constitutive model for unsaturated expansive clays[J]. , 2018, 37(7): 1731-1740.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0055 OR http://www.rockmech.org/EN/Y2018/V37/I7/1731

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