考虑应力方向依赖性的砂土等效统一硬化模型研究

doi:10.13722/j.cnki.jrme.2021.0930

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Abstract The stress direction dependence of soil refers to the property that the mechanical properties of soil change with the change of the stress direction. The inner reason for the special property is that the soil formed by particle accumulation is anisotropic on the micro scale. To quantitatively describe the difference of pore characteristics of anisotropic granular materials along different directions，the pore area ratio is proposed，that is，the ratio of the pore area to the particle area on a certain section of granular material. Then，the quantitative correlation between the pore area ratio and the fabric tensor is established. On this basis，the anisotropic state parameter is defined as the difference between the pore area ratio in the current direction and the average value of the pore area ratio(or the value of the pore ratio)，so as to quantitatively describe the relationship between the state in different directions and the average state of the material. The equivalent stress method is used to “transform” the unified hardening model(UH model)，and the equivalent unified hardening model(EUH model) is established. Only two new parameters are added in the new model which can be directly obtained by the triaxial compression tests. The stress direction dependence of the stress path，pore pressure，stress-strain relationship can be accurate predicted. Moreover，the accurate prediction of the stress direction dependence of each strain component in the main space and physical space is also realized. The result further verifies the scientificity of the equivalent stress method，and lays a solid foundation for the engineering application of the equivalent stress method.

Key words： soil mechanics stress direction dependence equivalent stress method unified hardening model pore area ratio anisotropic state parameter

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	Articles by authors
	DONG Tong1
	2
	KONG Liang3
	WANG Xing3
	FANG Yuyu1
	LIU Chao3

Cite this article:

DONG Tong1,2,KONG Liang3, et al. Equivalent unified hardening model of sand considering the stress direction dependence[J]. , 2022, 41(9): 1935-1944.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0930 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I9/1935

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