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Rock uniaxial compression whole-process creep damage model construction method

A technology of uniaxial compression and damage model, which is applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., and can solve problems such as simultaneous description

Active Publication Date: 2019-12-31
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing rock creep model does not have a unified functional expression to simultaneously describe the instantaneous strain generated by the loading process and the three stages of the whole creep process (attenuation creep stage, steady state creep stage and accelerated creep creep stage). stage)

Method used

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  • Rock uniaxial compression whole-process creep damage model construction method
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  • Rock uniaxial compression whole-process creep damage model construction method

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Embodiment Construction

[0069] The present invention will be further described below in conjunction with the accompanying drawings.

[0070] The invention includes carrying out rock uniaxial compression test, carrying out rock uniaxial compression creep test, determining the long-term strength of rock, determining the creep damage time of rock, determining the function expression of rock deformation modulus with time, and determining the rock creep damage variable The expression, determine the function expression of the creep damage model of the whole process of rock uniaxial compression, determine the parameters of the creep model, model validation nine steps.

[0071] Step 1, carry out rock uniaxial compression test;

[0072] Uniaxial compression tests were carried out on three cylindrical salt rock specimens with a diameter of 50 mm and a height of 100 mm to obtain the compressive strength of the three specimens. According to the test results, the compressive strengths of the three specimens are ...

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Abstract

The invention discloses a rock uniaxial compression whole-process creep damage model construction method. The method comprises the following steps of: carrying out a uniaxial compression test and a uniaxial compression creep test under the action of different axial stresses on a rock test piece to obtain the average compressive strength and creep curve of the rock, determining rock long-term strength and creep rupture time, determining a function expression of the deformation modulus changing along with time in the rock creep process, representing the elasticity modulus of the damaged rock material by the deformation modulus and determining an expression of a rock creep damage variable, determining a function expression of the creep damage model of the rock in the whole uniaxial compression process, and determining creep model parameters according to a rock uniaxial compression creep test result. The model built by the method can describe three stages of the whole process of instantaneous strain and creep generated in the rock loading process at the same time through a unified function expression, and therefore the defect that the existing model needs to manually divide the total strain generated in the rock creep process into four parts is overcome.

Description

technical field [0001] The invention belongs to the technical field of rock engineering, and in particular relates to a method for constructing a creep damage model in the whole process of rock uniaxial compression. Background technique [0002] The total strain generated during the rock creep process is composed of two parts: the time-independent instantaneous strain generated by the loading process and the creep strain that gradually increases with time, and the complete creep process of the rock includes attenuation creep, steady-state There are three stages of creep and accelerated creep. When existing creep models describe rock creep behavior, it is usually necessary to artificially divide the total strain generated during rock creep into four parts: instantaneous strain, decaying creep strain, steady-state creep strain, and accelerated creep strain. Different functions are used to describe the strains of different parts, and finally the total strain is obtained throug...

Claims

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0071G01N2203/0075G01N2203/0252
Inventor 王军保张强张玉伟宋战平刘新荣裴子铭肖珂辉
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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