采矿与岩层控制工程学报2025，Vol.7Issue(4)：153-169,17.DOI:10.13532/j.jmsce.cn10-1638/td.2024-1354
碳纤维布约束下煤样力学性能与能量损伤本构关系
Mechanical properties and energy damage constitutive relationship of coal samples confined by CFRP sheets
摘要
Abstract
To investigate the confinement effect of carbon fiber-reinforced polymer(CFRP)sheets on the mechanical properties and energy damage behavior of coal samples,uniaxial compression tests were conducted on coal samples with varying layers of CFRP sheets.The stress-strain changes during the four stages of crack compaction,linear elasticity,yield and post-peak failure were analyzed,and the influence of CFRP sheets on the energy input,accumulation,dissipation,and release processes in coal samples was studied.The results show that the crack closure stress and crack initiation stress of coal samples first increased and then decreased with the increase in CFRP layers,but still higher than that in the unconfined state,demonstrating a significant confining effect and a marginal diminishing feature.The CFRP sheets effectively constrained the internal crack propagation in coal,improved stress distribution,made the failure process slower and more orderly,significantly enhanced the load-bearing capacity and ductility,and reduced the post-peak stress drop phenomenon.The CFRP sheets enhanced the energy input and distribution uniformity of coal samples,reduced the energy release rate,and improved the energy distribution and failure process.CFRP confinement significantly improved the mechanical properties and energy dissipation characteristics of coal samples.The proposed dissipated energy damage factor model verified the effectiveness of CFRP sheets in delaying damage accumulation and crack propagation.A mathematical relationship was derived between the layers of CFRP sheets and the equivalent coal cylindrical sleeve thickness.The research advances the understanding of coal pillar reinforcement mechanism and provides an economical and efficient new perspective for improving the recovery rate of residual coal resources in room-and-pillar mining.关键词
煤柱加固/碳纤维增强复合材料/煤样/环向约束/耗散能损伤因子Key words
coal pillar reinforcement/carbon fiber-reinforced polymer(CFRP)/coal samples/circumferential confinement/dissipated energy damage factor分类
矿业与冶金引用本文复制引用
李庆文,聂帆帆,郑志明,贾志波,张学磊,杨浩..碳纤维布约束下煤样力学性能与能量损伤本构关系[J].采矿与岩层控制工程学报,2025,7(4):153-169,17.基金项目
辽宁省自然科学基金面上资助项目(2023-MS-298) （2023-MS-298）
辽宁省教育厅高校基本科研面上资助项目(JYTMS20230866) （JYTMS20230866）
辽宁省博士科研启动基金资助项目(2019-BS-120) （2019-BS-120）
辽宁省自然科学基金指导资助项目(20180550297) （20180550297）
