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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.

Active Publication Date: 2021-08-24
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no rheological constitutive model that can accurately describe all the above characteristics of the soft rock mass on site.

Method used

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

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specific Embodiment approach

[0031] Taking the construction method of the rheological constitutive model of the weak sandstone rock mass on site as an example, the specific implementation of the present invention is illustrated as follows:

[0032] 1) Establish a rheological constitutive model: connect a spring element 100 that is damaged and deteriorated with loading, an ideal viscous element 200, an Abel sticky pot element 300, and a nonlinear viscoplastic element 400 in series to establish a new weak rock mass flow Variable constitutive model. The rheological constitutive model of weak rock mass is as follows: figure 1 shown.

[0033] The constitutive relation of the model is:

[0034]

[0035] In the formula: σ and ε are total stress and total strain respectively; ε e , ε v , ε ve and ε vp are elastic strain, viscous strain, viscoelastic strain and viscoplastic strain, respectively; E 0 is the initial modulus of elasticity of the elastic element; α is the coefficient of damage influence degr...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G01N3/08G06F119/14
CPCG06F30/20G01N3/08G06F2119/14Y02T90/00
Inventor 罗慈友闫自海崔昊王紫娟沈碧辉
Owner POWERCHINA HUADONG ENG COPORATION LTD
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