河南理工大学学报（自然科学版）2025，Vol.44Issue(1)：29-36,8.DOI:10.16186/j.cnki.1673-9787.2023100027
不同加载速率对煤岩组合体巴西劈裂特性的影响
Effects of varying loading rates on the Brazilian splitting characteristics of coal-rock composites
摘要
Abstract
Objectives To investigate the tensile characteristics of coal-rock composite structures during the mining process,the study takes coal-rock composite specimens as the research object.Methods Brazilian splitting tests were conducted on coal-rock composite specimens under varying loading rates using the RMT150B testing machine.The effects of loading rates on the strength characteristics,failure modes,en-ergy features,and crack evolution during splitting failure were analyzed.Results The stress-strain curves of the coal-rock composites generally followed four stages:compaction,elasticity,yield,and failure.The fai-lure mode was independent of the loading rate,with all specimens splitting along the interface of the disks.The tensile strength of the composite increased with loading rate,showing significant changes under low loading rates,while the rate of increase diminished as the loading rate became higher.The energy concen-tration in coal-rock composite specimens ranged from 0.33 J to 0.42 J,and higher tensile strength required greater energy for failure.The stress-crack strain curve exhibited three stages before the peak:crack clo-sure,elasticity,and crack propagation.The crack parameters demonstrated a pronounced dependency on loading rates.Conclusions These findings provide valuable theoretical insights into the tensile failure mecha-nism of coal-rock composite structures.关键词
煤岩组合体/巴西劈裂/强度特征/能量特征/裂纹演化Key words
coal-rock composites/Brazilian splitting/strength characteristics/energy features/crack evolution分类
矿山工程引用本文复制引用
陈岩,王嘉豪,邓良涛,洪紫杰,荣腾龙,侯志强..不同加载速率对煤岩组合体巴西劈裂特性的影响[J].河南理工大学学报（自然科学版）,2025,44(1):29-36,8.基金项目
国家自然科学基金资助项目(51904092,52274078,52304084) （51904092,52274078,52304084）
河南省高等学校重点科研项目(24A440004) （24A440004）
