煤矿安全2026，Vol.57Issue(4)：82-95,14.DOI:10.13347/j.cnki.mkaq.20250476
围压作用下界面倾角对煤岩组合体损伤破坏的影响机制研究
Study on the influence mechanism of interface dip angle on damage and failure of coal-rock combinations under confining pressure
摘要
Abstract
To investigate the failure and instability mechanism of coal-rock combinations with different interface dip angles,a series of conventional triaxial compression simulation tests under a confining pressure of 4 MPa were conducted on coal-rock combina-tions with dip angles of 0°,15°,30°,45°,and 60° using discrete element numerical simulation software.The mechanical properties,stress evolution,crack evolution,failure patterns,and acoustic emission(AE)signals of the coal-rock combinations were systematic-ally studied,and the failure mechanism was further explored.The results show that with the increase in dip angle,the peak strength and total number of cracks of the coal-rock combinations gradually decrease;the elastic modulus increases significantly only at a dip angle of 60°;the crack propagation direction changes with the increase in dip angle,indicating a variation in the failure mode of the coal-rock combinations.The final failure pattern gradually transforms from an"X"shape to a"V"shape with increasing dip angle,and the failure region gradually approaches the lower right of the coal body and the interface,with cracks also appearing in some parts of the rock mass.At a dip angle of 60°,the failure surface is parallel to the interface.The duration of AE signals decreases and the peak occurs earlier with increasing dip angle,suggesting that the final failure degree of the coal-rock combinations reduces but the failure time advances.With the increase in dip angle,the failure mode of the coal-rock combinations gradually changes from shear failure to interface slip failure,and the failure region shifts from the coal body to the interface.At small dip angles,the inter-face effect is weak,and the failure of the combinations is mainly controlled by their material properties.With the increase in dip angle,the interface effect becomes significant,and slip dislocation becomes the dominant failure mode.Under large dip angle condi-tions,the final failure of the coal-rock combinations is mainly attributed to the structural instability of the interface.关键词
冲击地压/动力灾害/不同倾角/煤岩组合体/力学特性/响应特征/损伤破坏/失稳机制Key words
rock burst/dynamic disaster/different dip angles/coal-rock combinations/mechanical property/response characteristic/damage and failure/instability mechanism分类
矿业与冶金引用本文复制引用
王伟光,刘高飞,孙加智,杜锋..围压作用下界面倾角对煤岩组合体损伤破坏的影响机制研究[J].煤矿安全,2026,57(4):82-95,14.基金项目
国家自然科学基金面上资助项目(52374249,52404223) （52374249,52404223）
国家重点研发计划资助项目(2023YFC300900302-03) （2023YFC300900302-03）
