煤矿安全2024，Vol.55Issue(6)：19-29,11.DOI:10.13347/j.cnki.mkaq.20230008
卸荷砂岩渐进破坏及渗透特性的中间主应力效应研究
Study of intermediate principal stress effect on progressive damage and permeability characteristics of unloading sandstone
摘要
Abstract
In order to investigate the effect of intermediate principal stress on the progressive damage and permeability characterist-ics of unloading sandstone,the unloading test was carried out under different intermediate principal stress conditions based on a mul-tifunctional true triaxial fluid-solid coupling test system with gas-bearing sandstone as the research object;the exponential permeabil-ity model related to the cracked volume strain and damage variable were obtained.The results show that the crack closure stress,crack initiation stress and damage stress increase with the increase of intermediate principal stress,and the percentage of elastic sec-tion and microcrack extension stage in the pre-peak strain increases.The deformation in the direction of the intermediate principal stress is restrained in the microcrack extension stage,and the compression effect on the direction of the minimum principal stress is enhanced with the increase of the intermediate principal stress;in the macroscopic crack extension stage,the damage stress is closer to the peak stress,and the damage of the specimen is brittle in character.With the increase of the intermediate principal stress,the initial permeability reduction shows a decreasing trend and the point of elevated permeability shifts backward.关键词
中间主应力/卸荷/渐进破坏/砂岩渗透特性/岩石损伤Key words
intermediate principal stress/unloading/progressive damage/sandstone permeability characteristics/rock damage分类
矿业与冶金引用本文复制引用
杜佳慧,李文璞,常悦,王泽,王涛..卸荷砂岩渐进破坏及渗透特性的中间主应力效应研究[J].煤矿安全,2024,55(6):19-29,11.基金项目
国家自然科学基金青年科学基金资助项目(51804211,52204105) （51804211,52204105）
吕梁市重点研发资助项目(2022GXYF13) （2022GXYF13）
