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

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...

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

Images