考虑空隙压密特征的岩石弹塑性损伤增量本构模型

doi:10.13722/j.cnki.jrme.2022.1289

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Abstract The whole process of rock deformation and failure has several stages such as compaction，elasticity，plasticity and damage. There are few studies on constitutive models considering rock compaction deformation mechanism under the framework of classical elastoplastic damage theory. In this paper，the rock was abstracted as two parts，the rock skeleton and the rock void. The nonlinear compaction deformation was calculated according to the void deformation mechanism. The plastic deformation characteristics were analyzed using the Drucker-Prager criterion. The damage evolution law was described by the volume deformation. Under the framework of classical elastoplastic damage theory，a compaction-elastoplastic damage incremental constitutive model and its integral algorithm of rock were established. The total deformation of the rock was divided into three parts as compaction，elastic and plastic deformation. The void part cannot bear the shear force and the deformation in each direction has no mutual influence. Therefore，the total strain was calculated in the principal stress direction through the spectral representation of the stress and strain tensors. The numerical integration method was the return mapping algorithm in principal stress space based on Drucker-Prager criterion. The predicted stress was calculated by the compression elastic prediction method. The influence of the compaction strain increment on the total strain increment in one iterative step was analyzed. The compaction-elastoplastic damage constitutive model and algorithm fully consider the non-linear deformation mechanism of voids and compaction deformation characteristics. The proposed model contains ten parameters in four categories including compaction，elasticity，plasticity and damage. It is suitable for engineering rock mass whose void ratio increases and skeleton strength decreases under external action during long-term service. The model was used to study the effect of two typical external environments(dry-wet and freeze-thaw cycles) on rock properties. The results show that the model can well simulate the whole process of rock deformation and failure after external actions，which has certain theoretical significance and engineering value.

Key words： soil mechanics compression deformation incremental constitutive model Drucker-Prager criterion return mapping in principal axes dry-wet cycles freeze-thaw cycles

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	Articles by authors
	CHEN Huiguan1
	ZHAO Cheng1
	2
	ZHANG Rui1
	PAN Haoyu1

Cite this article:

CHEN Huiguan1,ZHAO Cheng1,2, et al. Elastoplastic damage incremental constitutive model of rock considering the characteristics of void compaction[J]. , 2023, 42(12): 3043-3055.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1289 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I12/3043

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