New weak rock mass rheological constitutive model construction and parameter identification method

A technology of constitutive model and model parameters, which is applied in the direction of electrical digital data processing, special data processing applications, and testing material strength by applying stable tension/compression.
CN113297720AActive Publication Date: 2021-08-24POWERCHINA HUADONG ENG COPORATION LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
POWERCHINA HUADONG ENG COPORATION LTD
Publication Date
2021-08-24

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Abstract

The invention provides a new weak rock mass rheological constitutive model construction and parameter identification method, which comprises the following steps: connecting an elastomer, a viscous body, a viscoelastic body and a viscoplastic body in series, and establishing a new weak rock mass rheological constitutive model; carrying out a compression creep test on a weak rock mass sample, obtaining test data, drawing a rheological test curve, and carrying out model parameter identification by adopting a Levenberg-Marquardt method based on the test data and the deformation and failure characteristics of the weak rock mass. According to the method, the full-stage deformation characteristics of gradual deterioration elastic deformation, attenuation creep, stable creep and accelerated creep of the on-site weak rock mass can be described, the creep parameters of the test weak rock mass can be obtained through a parameter identification method, and for the on-site weak rock mass and engineering soft rock with the full-stage creep characteristics, the model can describe rheological characteristics more accurately, and soft rock engineering long-term deformation analysis based on the model is more accurate and effective.
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Description

technical field

[0001] The invention relates to the technical field of rock engineering, in particular to a rheological constitutive model construction and parameter identification method suitable for weak rock mass. Background technique

[0002] The rheological constitutive model of rock is a mathematical physical model used to describe the relationship between stress-strain-time of rock, and it is a medium to establish the connection between rock rheological test-theory-application. The latest rheological test research on weak rock mass samples shows that the creep deformation of weak rock mass includes instantaneous deformation, attenuation creep deformation, stable creep deformation and accelerated creep deformation; when the stress level is lower than a certain stress threshold, the weak The creep of rock mass includes instantaneous elastic deformation, viscoelastic deformation and viscous flow deformation successively, and the model should include elastic elements and ...

Claims

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