黏质及砂质能源土统一的弹塑性本构模型

doi:10.13722/j.cnki.jrme.2022.0149

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Abstract At present，triaxial tests of energy soils and their constitutive models are mostly based on coarse-grained reservoirs such as sandy soils. There are few tests and constitutive simulations of clayey-silty energy soils，and it is even rarer to have a constitutive model that can uniformly describe clayey and sandy energy soils. In this paper，triaxial tests of clayey-silty energy soils were firstly carried out，and the mechanical properties of energy soils were deeply summarized based on previous achievements. Then，under the framework of unified hardening model for clays and sands(CSUH)，considering the special mechanical characteristics of energy soils，the compressibility parameter related to hydrate saturation was constructed to describe the compression characteristics of energy soils. The cementation factor and dilatancy factor were introduced to reflect the cohesive strength and dilatancy effect respectively. The shear state of energy soils was reflected by state parameter，and an elastoplastic constitutive model which could describe clayey and sandy energy soils in a unified way was established by combining the non-associated flow rule. The verification program of the model was compiled，and the validity of the constitutive model was verified by several groups of triaxial tests of this paper and other scholars. The results show that the established elastic-plastic constitutive model can uniformly describe the shear characteristics of clayey fine-grained and sandy coarse-grained energy soils. It can effectively reflect the mechanical characteristics of energy soils such as strain hardening and softening，shear contraction and dilatation. It also has a good prediction effect on the influence of hydrate saturation and effective confining pressure.

Key words： soil mechanics natural gas hydrate clayey and sandy mechanical properties CSUH model cementation shear dilatation

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	Articles by authors
	ZHAO Yapeng1
	2
	3
	LIU Lele3
	4
	KONG Liang1
	2
	SANG Songkui1
	2
	WANG Xing1
	2
	LIU Jiaqi1

Cite this article:

ZHAO Yapeng1,2,3, et al. Unified elastoplastic constitutive model for clayey and sandy energy soils[J]. , 2022, 41(12): 2579-2591.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0149 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I12/2579

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