含水纵向裂隙煤岩破裂特征与演化规律研究  

Fracture Characteristics and Evolution Law of Water-Bearing Coal Rock with Longitudinal Fractures

作　　者：李小辉 邢楷 彭群 LI Xiaohui;XING Kai;PENG Qun(Sihe Coal Mine,Jinneng Holding Equipment Manufacturing Group,Jincheng,Shanxi 048000,China;Shanxi Jinmei Group Technology Research Institute Co.,Ltd,Jincheng,Shanxi 048000,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]晋能控股装备制造集团寺河煤矿,山西晋城市048000 [2]山西晋煤集团技术研究院有限责任公司,山西晋城市048000 [3]北京科技大学土木与资源工程学院,北京100083

出　　处：《矿业研究与开发》2024年第7期191-196,共6页Mining Research and Development

基　　金：国家自然科学基金项目(52174106)。

摘　　要：煤岩中的纵向裂隙与含水率对煤岩的力学性质和破裂特征具有显著影响。对含水纵向裂隙煤岩进行了单轴压缩试验并监测声发射事件。分析了含水状态下纵向裂隙对煤岩峰值应力、峰值应变、弹性模量以及破坏模式的影响,并探讨了含水率与煤岩力学特性之间的关系。研究揭示了完整煤岩与纵向裂隙煤岩在破坏模式上的显著差异:完整煤岩倾向于发生自持性破坏,而纵向裂隙煤岩的破坏表现为非自持性破坏,并且峰值强度较完整煤岩下降约20%。此外,纵向裂隙煤岩在加载过程中,当加载时间达到48.5%~62.6%时,声发射事件会在煤岩的破坏中心区域发生聚团现象。研究还发现,含水率与浸水时间之间的关系为ω_(a)=0.82lnt+0.31,峰值强度与含水率之间的关系为σ=19.77-3.11ω_(a)。这些试验结果不仅对煤岩破坏模式、破坏范围和破坏强度的定性描述提供了依据,还对探究煤岩的变形破坏机制和地下工程的稳定性分析具有重要的参考价值。The longitudinal fractures and water content in coal rock have a significant effect on the mechanical properties and fracture characteristics of coal rock.Uniaxial compression tests were conducted on water-bearing coal rocks with longitudinal fractures,and acoustic emission events were monitored.The influences of longitudinal fractures on the peak stress,peak strain,elastic modulus,and failure mode of water-bearing coal rock were analyzed,and the relationship between water content and mechanical properties of coal rock was explored.The study reveals the significant difference in failure modes between intact coal rock and coal rock with longitudinal fracture,that is intact coal rock tends to self-sustaining failure,while coal rock with longitudinal fracture shows non-self-sustaining failure,and the peak strength decreases by about 20%.In addition,during the loading process of coal rock with longitudinal fracture,when the loading time reaches 48.5%-62.6%,the acoustic emission events will agglomerate in the failure center area of the coal rock.It is also found that the relationship between water content(ω_(a))and soaking time(t)isω_(a)=0.82lnt+0.31,and the relationship between peak strength(σ)and water content(ω_(a))isσ=19.77-3.11ω_(a).These experimental results not only provide a basis for the qualitative description of the failure mode,failure range,and failure strength of coal rock,but also have an important reference for exploring the deformation and failure mechanism of coal rock and the stability analysis of underground engineering.

关 键 词：浸水煤岩 纵向裂隙 单轴压缩 声发射 

分 类 号：TD315[矿业工程—矿井建设]