矿业科学学报2026，Vol.11Issue(3)：556-569,14.DOI:10.19606/j.cnki.jmst.2025074
三轴循环加卸载裂隙砂岩渗透性演化规律研究
The permeability evolution law of fractured sandstone under triaxial cyclic loading and unloading
摘要
Abstract
The permeability change of coal and rock induced by repeated mining during coal seam group exploitation is a key factor restricting mine gas drainage.To explore the permeability evolution law un-der repeated mining,the permeability tests on fractured sandstone with different prefabricated dip an-gles were conducted under cyclic loading and unloading.The permeability evolution mechanism was re-vealed.The results indicated that:① Fractured sandstone permeability generally declines,then slowly increases and suddenly surges during cyclic loading and unloading.In each cycle,permeability chan-ges from"decrease-increase-decrease"to"increase-increase-decrease".The end of the unloading phase can be used as a pre-extraction point for gas drainage.② With more cyclic loading and unloa-ding,instability and failure of fractured sandstone with different dip angles intensify,and permeability increases more significantly.③ Fractured sandstone with a dip angle of 45° and 60° has higher devia-toric stress sensitivity coefficients and irreversible permeability damage rates,and the former decreases with increasing confining pressure.④ Fracture dip angles affect the stress field around fractures,influ-encing fracture initiation and propagation,thus altering permeability.At the final failure stage,the per-meability of fractured sandstone with different dip angles increases by 2-9 times.The research findings have significant implications for gas drainage in coal seams and safe mining operations.关键词
循环加卸载/渗透率/偏应力/敏感性分析/渗透率损害率Key words
cyclic loading and unloading/permeability/deviatoric stress/sensitivity analysis/permea-bility damage rate分类
矿业与冶金引用本文复制引用
黄炳雄,李振,冯国瑞,韩磊,李桂臣,杜锋,杨鹏,李骐..三轴循环加卸载裂隙砂岩渗透性演化规律研究[J].矿业科学学报,2026,11(3):556-569,14.基金项目
国家自然科学基金(52474141,52525401) （52474141,52525401）
山西省基础研究计划(202403021211069) （202403021211069）
