Rock uniaxial compression accelerated creep starting time prediction method

A technology of uniaxial compression and accelerated creep, which is applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., and can solve the problem of determining and predicting the start time of rock accelerated creep. problems, to achieve the effect of reducing the hazards of people's lives and property

Pending Publication Date: 2022-02-18
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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At present, there are few studies on the determination and p...

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  • Rock uniaxial compression accelerated creep starting time prediction method
  • Rock uniaxial compression accelerated creep starting time prediction method
  • Rock uniaxial compression accelerated creep starting time prediction method

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] The invention includes carrying out rock uniaxial compression creep test, drawing the change law curve of rock creep rate with time, determining the function expression of viscosity coefficient change with time, establishing the constitutive equation of improved Maxwell model, and obtaining the improved Maxwell model Creep equation, determine the parameters of the improved Maxwell model, draw the change law curve of the viscosity coefficient with time and the rock creep curve under the corresponding axial stress in the double vertical axis coordinate system, and determine the eight steps of the rock accelerated creep start time .

[0047] Step 1, carry out rock uniaxial compression creep test;

[0048] Using a single-stage loading method, different axial stress σ was carried out on a cylindrical salt rock specimen with a diameter of 50 mm and a height of 100 mm...

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Abstract

The invention discloses a rock uniaxial compression accelerated creep starting time prediction method, which comprises the following steps: determining parameters of an improved Maxwell model according to a rock uniaxial compression creep test result; drawing the change rule curve of the viscosity coefficient along with the time and the rock creep curve under the corresponding axial stress in a double-longitudinal-axis coordinate system, determining an attenuation creep end point A, and drawing a vertical line passing through the point A, wherein the vertical line and the change rule curve of the viscosity coefficient along with the time intersect at a point B; and drawing a horizontal line passing through the point B, intersecting the horizontal line and the time-varying rule curve of the viscosity coefficient at a point C, and taking the time corresponding to the point C as the accelerated creep starting time of the rock. According to the method, the starting time of the rock uniaxial compression accelerated creep can be accurately predicted by improving the Maxwell model, accurate prediction of the starting time of the rock accelerated creep is realized, early warning can be performed during rock accelerated creep, and occurrence of harm of surrounding rock collapse to lives and properties of people is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of rock engineering, and in particular relates to a method for predicting the start time of rock uniaxial compression accelerated creep. Background technique [0002] The complete creep process of rock usually includes three stages: attenuation creep, steady state creep and accelerated creep. Although the rock creep damage time can be predicted according to the Kachanov creep damage law, for underground engineering, in order to ensure the safety of people's lives and property, the surrounding rock collapse is not allowed. Once the deformation of the surrounding rock enters the stage of accelerated creep, it must be supported immediately to ensure the stability of the surrounding rock. Therefore, it is of great significance to accurately determine and predict the initiation time of rock accelerated creep. At present, there are few studies on the determination and prediction methods of the initiation time of...

Claims

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0019G01N2203/0071G01N2203/0252
Inventor 王军保王晓鹏张玉伟宋战平冯世进王彤姜恒坤
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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