辽宁工程技术大学学报（自然科学版）2025，Vol.44Issue(3)：265-272,8.DOI:10.11956/j.issn.1008-0562.20240249
不同浸泡时间下煤岩组合体破坏特征点能量演化机制
Mechanisms of energy evolution at damage characterization points of coal-rock assemblages under different immersion time
摘要
Abstract
In order to explore the energy evolution mechanism of the characteristic points in the deformation and failure process of the coal-rock combination under different soaking time,the uniaxial compression test of a coal-rock mass under different soaking time was carried out.The results show that with the increase of the soaking time of the coal-rock combination,the elastic modulus,compressive strength and brittleness index are negatively correlated with the soaking time,and the peak strain is positively correlated with the soaking time.Based on the principle of energy calculation,it can be seen that with the extension of soaking time,the proportion of elastic strain energy increases gradually at the starting point of linear elasticity of coal-rock combination,and the proportion of dissipated energy in the process of microcrack formation and pore closure is relatively low.At the peak stress,the weaker the ability to store elastic strain energy and absorb total strain energy,the higher the proportion of dissipated energy,indicating that the energy dissipation is more significant.At the post-peak complete failure,the total strain energy absorbed shows a downward trend,indicating that its ability to absorb external energy is gradually decreasing.The evolution law of the impact tendency of the coal-rock combination was further explored.When the soaking time of the combination increased to 21 days,the energy impact index IACF and the improved brittleness index IBIM gradually decreased.However,when the soaking time increased to 28 days,that is,the sample reached saturation,IACF and IBIM showed an upward trend.The research results can provide reference for the prediction and evaluation of water disaster and rock mechanics evaluation of coal and rock pillars.关键词
煤岩组合体/浸泡时间/能量演化/力学特性/半轴压缩实验/能量耗散Key words
coal-rock assemblage/immersion time/energy evolution/mechanical properties/uniaxial compression test/energy dissipation分类
矿业与冶金引用本文复制引用
王成,李洋,刘江斌,张仲杰,于永江,刘佳铭..不同浸泡时间下煤岩组合体破坏特征点能量演化机制[J].辽宁工程技术大学学报（自然科学版）,2025,44(3):265-272,8.基金项目
国家自然科学基金项目(52374092) （52374092）
