基于Cosserat理论的三维弹塑性模型及其在重力坝抗滑稳定分析中的应用

doi:10.13722/j.cnki.jrme.2020.1171

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Abstract To solve the issues of finite mesh size sensitivity and mesh locking in applying finite element method to simulate strain localization in geotechnical engineering，a three-dimensional Mohr-Coulomb elastoplastic model was developed by introducing Cosserat continuum theory as a regularization mechanism. The secondary development function of ABAQUS and Euler backward implicit stress update algorithm were adopted to realize numerical simulation，and the reliability and effectiveness of the model and program were verified by numerical simulation of uniaxial compression. The relationship between the bending characteristic length and the shear band width was discussed，and the value standard of the bending characteristic length was proposed. The three-dimensional anti-sliding stability analysis of a gravity dam was carried out repectively by the classical elastic-plastic model and the proposed model. It is shown that the classical elastic-plastic model has obvious mesh dependence，more specifically，an overestimation of the actual anti-sliding stability resulted from sparse finite element mesh，while that the anti-sliding stability safety factor and the sliding mode by the developed model almost keep unchanged for different density finite element mesh.

Key words： slope engineering strain localization Cosserat Mohr-Coulomb gravity dam 3D anti-sliding stability

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	Articles by authors
	TANG Jiabo1
	2
	MA Gang1
	2
	TU Chengyi3
	CAO Xuexing4
	ZHOU Wei1
	2
	CHENG Yonggang1
	2

Cite this article:

TANG Jiabo1,2,MA Gang1, et al. Three-dimensional elastic-plastic model based on Cosserat theory and its application in anti-sliding stability analysis of gravity dams[J]. , 2021, 40(8): 1702-1712.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.1171 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I8/1702

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