煤田地质与勘探2026，Vol.54Issue(4)：190-203,14.DOI:10.12363/issn.1001-1986.26.01.0021
不同浸水状态煤岩组合体动力响应特征与破坏机制
Dynamic response characteristics and failure mechanism of coal-rock combination under different immersion conditions
摘要
Abstract
[Background]In practical engineering,the waterproof coal pillar usually suffers from different degrees of dynamic load from the overlying strata,and its internal water distribution is non-uniform.Although the traditional"wa-ter content"index can reflect the overall water content,it is difficult to describe the non-uniform characteristics of the soaking space.Therefore,it is of great significance to clarify the dynamic failure mechanism of coal and rock mass un-der different immersion conditions for stability zoning control.[Methods]On this basis,the coal-rock combined bodies under three different forms of immersion,namely:complete immersion,unilateral immersion,and non-immersion were prepared.These specimens were then subjected to split hopkinson pressure bar testing combined with high-speed photo-graphy,digital image correlation(DIC),and CT scanning,supplemented by FLAC-PFC3D coupled numerical simula-tions.Thereafter,the evolutionary characteristics of stress-strain,crack propagation,energy distribution,and force chain structure of these specimens under impact pressure of 0.3 MPa,0.5 MPa,and 0.7 MPa were compared from macroscop-ic and mesoscopic angles.[Results and Conclusions](1)Due to inertial confinement and strain-rate strengthening,the peak stress and elastic modulus of the specimens increase with impact pressure,but are reduced by water-induced soften-ing.(2)The softening of water immersion makes the crack tip more likely to turn,forming a tortuous composite tensile-shear path,while the dry coal keeps brittle tensile fracture.With the increase of impact pressure,the main crack will gradually approach the interface,the damage degree will evolve from micro to macro,and the crack morphology will de-velop from single to composite.(3)Under the same immersion condition,the change of medium and high impact pres-sure has little effect on the proportion of reflection energy,dissipation energy and transmission energy.On the contrary,under the same impact pressure,different immersion states significantly affect the energy proportion of each part.(4)The immersion effect promotes the degeneration of the force chain,resulting in the transformation of the impact pressure-driven system from uniform energy consumption to local load carrying,and the failure mode of coal-rock combined bodies will change from tensile failure to shear failure with the increase of the impact pressure and the decrease of the immersion volume.The research results can provide a theoretical basis for the stability zoning control of dynamic load waterproof coal pillar.关键词
煤岩组合体/浸水状态/分离式霍普金森压杆(SHPB)/冲击气压/动力响应/分区控制Key words
coal-rock combination/immersion condition/split hopkinson pressure bar/impact pressure/dynamic re-sponse/regional control分类
矿业与冶金引用本文复制引用
张向阳,童治鹏,段云刚,杨伟昆,陈建本,许林峰..不同浸水状态煤岩组合体动力响应特征与破坏机制[J].煤田地质与勘探,2026,54(4):190-203,14.基金项目
安徽省自然科学基金面上项目(2508085ME131) （2508085ME131）
深部煤炭安全开采与环境保护全国重点实验室开放基金重点项目(2025ZD004) （2025ZD004）
安徽理工大学高层次人才科研基金项目(2024yjcr159) （2024yjcr159）
