西安科技大学学报2025，Vol.45Issue(4)：692-703,12.DOI:10.13800/j.cnki.xakjdxxb.2025.0406
单轴压缩下裂隙煤体能量演化与数值模拟
Energy evolution and numerical simulation of fractured coal under uniaxial compression
摘要
Abstract
To investigate the influence of different crack angles on the stability of coal,uniaxial com-pression tests were conducted on coal samples containing cracks at various angles.The study focused on the effects of crack angles on the mechanical properties,acoustic emission characteristics,energy evolu-tion,and crack propagation of coal.Numerical simulations were also employed to analyze the changes in stress and displacement fields during the damage process of coal with different crack angles.The results indicate that as the crack angle increases,the peak stress and elastic modulus of the coal increase in a quadratic relationship.The evolution of acoustic emission energy in coal with different crack angles can be divided into three stages:slow development,rapid development,and intense development.The cumu-lative acoustic emission energy increases linearly with the crack angle.More than 75％of the total en-ergy absorbed before the peak can be converted into elastic energy stored in the coal,while less than 25％of the total energy is dissipated before the peak.As the crack angle increases,the elastic energy absorbed by the coal before the peak gradually increases,and the degree of energy release at failure al-so increases accordingly.The crack angle has a certain influence on the development of different types of cracks;the smaller the crack angle,the more complex the types of cracks in the coal.During the loading process,the range of tensile stress concentration in the coal is larger than that of compressive stress concentration.As the crack angle increases,the range of stress concentration in the coal signifi-cantly decreases,and the degree of coal degradation caused by cracks is reduced.The findings provide a reference for further exploration of the energy evolution laws in cracked coal.关键词
预制裂隙/能量演化/裂纹演化/破坏模式/数值模拟Key words
prefabricated cracks/energy evolution/crack evolution/failure mode/numerical simulation分类
矿业与冶金引用本文复制引用
肖鹏,李秉昆,黄晓昇,张鑫洋,陈紫溪,卜熊飞..单轴压缩下裂隙煤体能量演化与数值模拟[J].西安科技大学学报,2025,45(4):692-703,12.基金项目
国家自然科学基金项目(52074216,52374231) （52074216,52374231）
