陕西煤炭2024，Vol.43Issue(7)：9-14,6.DOI:10.20120/j.cnki.issn.1671-749x.2024.0702
煤岩体损伤破坏演化规律试验研究
Experiment on damage and failure evolution law of coal rock mass
刘春辉 1高海东 1焦博朋 1李胜利1
作者信息
- 1. 陕西黄陵二号煤矿有限公司,陕西延安 727307
- 折叠
摘要
Abstract
In order to study the damage and failure characteristics of coal and rock mass,the statistical tests of surface dam-age of coal and rock samples under unidirectional loading were carried out with prepared standard briquette samples,the damage evolution of coal and rock mass is studied by digital image technology,and the relationship between speckle dam-age,instantaneous strain,strain change and damage is analyzed.The results show that the damage process of specimen sur-face is divided into four stages:compaction stage,elastic deformation stage,peak stress stage and post-peak failure stage.Based on the analysis of the fissures caused by three types of coal sample damage,it is found that the law of strain increasing along x,y and xy directions is similar,the changes along y direction and xy direction are not obvious,but the changes along x direction are obvious and close to the increasing trend of damage,it is indicated that the strain change along x direction is the main factor of coal sample damage,and the increase of damage accumulation in different development stages leads to the different development degree of fissures,and finally forms the different damage types of coal sample surface.关键词
煤岩体/损伤破坏/应力变化/应变变化/裂隙发育Key words
coal and rock mass/damage and failure/stress variation/strain variation/fracture development分类
矿业与冶金引用本文复制引用
刘春辉,高海东,焦博朋,李胜利..煤岩体损伤破坏演化规律试验研究[J].陕西煤炭,2024,43(7):9-14,6.
