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Determination method of characteristic stress in rock damage evolution process based on energy analysis

A technique for energy analysis, damage evolution, applied in the direction of analyzing materials, testing material strength using applied stable tension/pressure, measuring devices, etc.

Inactive Publication Date: 2020-09-11
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the existing problems in determining the characteristic stress at present, and propose a method for determining the characteristic stress in the process of rock material damage evolution based on energy analysis

Method used

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  • Determination method of characteristic stress in rock damage evolution process based on energy analysis
  • Determination method of characteristic stress in rock damage evolution process based on energy analysis
  • Determination method of characteristic stress in rock damage evolution process based on energy analysis

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Embodiment

[0043] The method for determining the characteristic stress in the process of rock material damage evolution based on energy analysis of the present invention comprises the following steps:

[0044] (1) On-site drilling of complete cores;

[0045] (2) The above-mentioned rock core is processed in the laboratory to prepare a cylindrical sample with a diameter of 50mm and a height of 100mm;

[0046] (3) divide the prepared cylindrical sample into two groups of A and B;

[0047] (4) Determine the confining pressure value P according to the site conditions; carry out conventional uniaxial (confining pressure P is 0) or triaxial (confining pressure P is not 0) tests on the samples of group A to determine the rock peak stress value σ f or rock peak strain value ε f ;

[0048] (5) The graded cyclic loading and unloading test under the above confining pressure value P is carried out on the samples of group B. The unloading point before the peak takes the above rock peak stress val...

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Abstract

The invention discloses a method for determining characteristic stress in a rock material damage evolution process based on energy analysis, and mainly relates to crack closure stress, initiation stress and damage stress in the rock material damage evolution. The minimum value of the energy consumption ratio on the energy consumption ratio-axial strain curve is taken as a first point to draw a vertical line 1, and the rock damage stress can be found on the outer envelope line of the axial stress-strain curve; a straight line 1 is drawn from the point to the upper left along the energy consumption ratio-axial strain curve, a vertical line 2 is drawn at the position where the straight line 1 deviates from the energy consumption ratio-axial strain curve, and the intersection point on the corresponding axial stress-strain curve outer envelope line is the rock initiation stress; and the rock initiation stress is taken as a second point along the axial stress-strain curve outer envelope lineto draw a straight line 2, the straight line 2 is drawn towards the origin of coordinates, the position which deviates from the axial stress- strain curve outer envelope line is the rock crack closure stress. The method for determining characteristic stress in the rock material damage evolution process based on energy analysis has strong operability, further reduces human subjectivity; and the method for determining characteristic stress in the rock material damage evolution process based on energy analysis is more advantageous in terms of operation process and determination of the amount ofcharacteristic stress.

Description

technical field [0001] The invention relates to a method for determining the characteristic stress in the rock material damage evolution process based on energy analysis, in particular to a method for determining the characteristic stress of the full stress-strain curve of the rock material uniaxial compression test and triaxial compression test, that is, the crack closure stress in the rock material damage evolution process σ cc , crack initiation stress σ ci , damage stress σ cd . Background technique [0002] Laboratory tests of rock materials (uniaxial compression test, triaxial compression test) generally show that: the damage evolution process of the loaded rock sample has experienced the closure, initiation, development and penetration of internal cracks, etc., according to the damage of the loaded rock sample The evolution state, the total stress-strain curve obtained from the test is divided into the compaction stage, the linear elastic deformation stage, the sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/32G01N1/08G01N1/28
CPCG01N1/08G01N1/28G01N3/08G01N3/32G01N2001/2893
Inventor 杨小彬程虹铭聂朝刚吕嘉琦侯鑫
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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