Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for determining characteristic stress in rock material damage evolution process based on energy analysis

A technology for rock material and energy analysis, applied in the direction of analyzing materials, using stable tension/pressure to test material strength, and using repetitive force/pulse force to test material strength, etc.

Inactive Publication Date: 2019-10-01
CHINA UNIV OF MINING & TECH (BEIJING)
View PDF11 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for determining characteristic stress in rock material damage evolution process based on energy analysis
  • Method for determining characteristic stress in rock material damage evolution process based on energy analysis
  • Method for determining characteristic stress in rock material damage evolution process based on energy analysis

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
heightaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com