引入离散元所得破损规律的结构性黄土本构模型

doi:10.13722/j.cnki.jrme.2014.1372

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Abstract The strength and deformation character of structured loess are closely related to the breakage of internal microstructure and the breakage law of microstructure has not been measured by experiment due to the limitation of microstructure test technology. Hence the evolution law of the breakage parameter for ideal structured loess under loading and wetting，which is obtained by discrete element method(DEM)，is incorporated in the binary medium model with the form of strain sharing and the mechanical responses of the model are obtained to verify the reasonability of the breakage evolution law. Firstly，the constitutive equations are given，in which the model of bonding element adopts elastic model，frictional element adopts modified cam clay model and the formula form of breakage parameter are obtained from the numerical test on the ideal structured loess under loading and wetting. Secondly，the numerical program is compiled to verify the behavior of the model in one dimensional compression test，one dimensional wetting test，conventional triaxial compression test and the triaxial wetting test. The results indicate the model can reflect the deformation behavior of loess in one dimensional compression test and the relation between collapsibility coefficient and vertical pressure in one dimensional wetting test. It can simulate the variation of volumetric strain during shearing under different consolidation pressure，the variation of initial elastic modulus with confining pressure in conventional triaxial compression test and the wetting induced deformation law in triaxial wetting test. The effect of bonding element parameter on mechanical character is apparent. The breakage law obtained by DEM experiments is more reasonable than the existing law for triaxial compression test with strain-hardening behavior.

Key words： soil mechanics structured loess breakage parameter micro-mechanism constitutive model

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	HU Haijun1
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	JIANG Mingjing2

Cite this article:

HU Haijun1,2,JIANG Mingjing2. Constitutive model of structured loess incorporating the breakage law obtained by discrete element method[J]. , 2016, 35(S1): 3241-3248.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1372 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/3241

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