Method for establishing elastic-plastic constitutive model of material or soil body

Abstract

The invention relates to the field of geotechnical engineering, in particular to a method for establishing an elastic-plastic constitutive model of a material or a soil body. Lateral loading test data of the material or the soil body are selected by the method. The data are obtained by an in-site test of the material or the soil body through a lateral loading test. When an elastic-plastic stage of the material or the soil body is defined, curve fitting is conducted on the relation between pressure of the lateral loading test and volumetric strain of the soil body according to the lateral loading test data. A matrix of relation of a stress increment and a strain increment of the material or the soil body is calculated. The method for establishing the elastic-plastic constitutive model of the material or the soil body has the advantages that an explicit stress-strain relation can be established, a model expression is simple, deformation characteristics of the soil body in the elastic-plastic stage can be reflected, the number of model parameters are small and the model parameters can be obtained through the lateral loading test, meanwhile, an embedded program of general finite element software can be compiled from the method, and therefore the method is widely used for calculation and analysis of the geotechnical engineering.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a method for establishing a material or soil elastic-plastic constitutive model. Background technique [0002] At present, the elastoplastic constitutive models of soil in geotechnical engineering are mostly based on the theory of elastoplasticity of rock and soil. Through indoor experiments or energy theory, certain yield conditions, flow laws and loading conditions are assumed to be established. The model expressions are complex, and the stress-strain The relationship is not clear, there are many parameters and it is not easy to obtain, and it is mostly used for theoretical analysis, but it is difficult to apply in actual engineering. Contents of the invention [0003] The purpose of the present invention is to provide a kind of method of establishing material or soil elastoplastic constitutive model according to above-mentioned deficiencies in the prior art, this meth...

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Problems solved by technology

[0002] At present, the elastoplastic constitutive models of soil in geotechnical engineering are mostly based on the theory of elastoplasticity of rock and soil. Through indoor experiments or energy theory, certain yield conditions, flow laws and loading conditions are assumed to be established. The model expressions are complex, and the stress-strain The relationship is not clear, there are many parameters and it is not easy to obtain, it is mostly used for theoretical analysis, and it is difficult to apply in actual engineering

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