考虑剪胀与软化的接触面弹塑性模型

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Abstract The mechanical behaviors of the interface between coarse-grained soil and concrete are investigated by large-scale simple shear tests under conditions of mixed soil slurry(bentonite mixed with cement grout). The results indicate that phenomena of dilatancy and stress-strain softening are significant with presence of mixed soil slurry. The peak strength and the position where the dilatancy occurs are related to normal stress. The shear strain corresponding to the shear dilatation appears to be ahead of that corresponding to the peak value of shear stress under the same normal stress. In order to describe the interface deformation behavior，a elasto-plastic constitutive model of soil-structure interface in considering of dilatancy and strain softening is formulated in the framework of generalized potential theory；and plastic state equations are used to replace the traditional yield surface. The relation curves of shear stress and shear strain are fitted by a piecewise function composed by hyperbolic functions and resembling normal functions，as well as the relation curves of normal strain and shear strain. The entire model parameters can be identified by experimental tests. Combined with measured values，the maximum error between the results of shear stress and normal strain calculated by the model and the test values is within 10.5% and 12.7% respectively. So the validity of the model is verified.

Key words： soil mechanics simple shear test mixed soil slurry generalized potential theory constitutive model

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	Articles by authors
	PENG Kai1
	2
	3
	ZHU Jungao2
	FENG Shurong1
	CAI Changguang1
	ZHU Sheng3

Cite this article:

PENG Kai1,2,3, et al. ELASTO-PLASTIC CONSTITUTIVE MODEL OF INTERFACE INCORPORATING STRAIN SOFTENING AND DILATANCY[J]. , 2013, 32(s2): 3979-3986.

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3979

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