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A method for building elastic-plastic constitutive model of material or soil

A soil elastic-plastic and constitutive model technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of unclear stress-strain relationship, complex model expression, difficult to obtain, etc., to achieve model expression simple effect

Active Publication Date: 2016-09-21
SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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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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  • A method for building elastic-plastic constitutive model of material or soil
  • A method for building elastic-plastic constitutive model of material or soil
  • A method for building elastic-plastic constitutive model of material or soil

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Embodiment

[0015] Embodiment: This embodiment is a method for establishing the elastoplastic constitutive model of soil through in-situ testing. This method analyzes the elastoplastic stage of the lateral pressure test according to the column hole expansion theory, and based on the statistics of a large number of lateral pressure test data In the above, the elastic-plastic stage pressure and volume strain are fitted with the ellipse relationship, and finally the relationship matrix between the elastic-plastic stage strain increment and the stress increment is established, and the soil elastic-plastic constitutive model based on the lateral pressure test is constructed. The model parameters less, and the expression is clear, and most of the parameters can be obtained through the side pressure test, which is convenient for practical engineering application.

[0016] This embodiment is specifically realized through the following steps:

[0017] Select the side pressure test data, the side p...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 顾国荣杨石飞苏辉
Owner SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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