原煤与型煤破裂过程的声发射响应特征对比研究  

Comparative Study on the Acoustic Emission Response Characteristics of the Failure Process of Raw Coal and Briquette

作　　者：赵煜坤 董泽星 王帅旗 曹阔 ZHAO Yukun;DONG Zexing;WANG Shuaiqi;CAO Kuo(Qincheng Mining Industry Co.,Ltd.,Jincheng 048200,China;Shanxi Yangcheng Yangtai Group Yuchang Coal Industry Co.,Ltd.,Jincheng 048100,China;School of Safety Engineering,North China Institute of Science&Technology,Yanjiao 065201,China)

机构地区：[1]山西晋城沁城煤业有限责任公司,山西晋城048200 [2]山西阳城阳泰集团宇昌煤业有限公司,山西晋城048100 [3]华北科技学院安全工程学院,河北燕郊065201

出　　处：《煤》2025年第3期102-108,共7页Coal

摘　　要：文章对煤炭资源开采中煤体的破坏演化过程进行监测,对煤矿安全生产和避免经济损失具有重要意义。本研究旨在进一步提高煤炭资源开采过程中声波监测方法的有效性和准确性。为此,利用岩石力学测试系统和声发射测试系统对原煤与型煤进行单轴加载下的声发射事件定位实验。根据b值和单链接聚类方法的基本理论,研究了b值、空间相关长度ξ和信息熵H等相关参数随应力的变化趋势,揭示了这3个参数变化的原因。分析结果表明,加载初期b值变化不明显,但空间相关长度ξ在加载初期呈上升趋势。与b值和空间相关长度ξ相比,在加载过程的大部分时间内,信息熵H对原煤与型煤的破坏状态不敏感。但值得注意的是,在原煤与型煤试样屈曲破坏前,这3个参数均呈现出明显的变化趋势。基于三维裂纹扩展理论和微裂纹密度判据,表明这些参数的变化是原煤与型煤试样在单轴载荷作用下由小尺度微破裂向大尺度微破裂、由局部损伤向整体损伤转变过程的宏观表征。本研究为利用声发射源定位技术评价高应力条件下原煤与型煤的破坏状态提供了一种新的方法,对保障煤炭资源开采过程中的生命财产安全具有重要的指导意义和参考价值。Monitoring the damage evolution process of coal body in coal resource mining is of great significance for the safe production of coal mines and avoiding economic losses.This study aims to further improve the effectiveness and accuracy of acoustic monitoring methods during coal resource mining.To this end,acoustic emission event localization experiments under uniaxial loading were conducted on raw coal and type coal using a rock mechanics testing system and an acoustic emission testing system.According to the basic theory of b-value and single link clustering method,the trends of the relevant parameters such as b-value,spatial correlation lengthξand information entropy H with stress were investigated,and the reasons for the changes of these three parameters were revealed.The analysis results show that the b-value does not change significantly at the beginning of loading,but the spatial correlation lengthξshows an upward trend at the beginning of loading.Compared with the b-value and the spatial correlation lengthξ,the information entropy H is insensitive to the damage state of the original coal and the type coal during most of the loading process.However,it is worth noting that all these three parameters show a significant trend before the buckling damage of the raw coal and coal-type specimens.Based on the three-dimensional crack extension theory and the microcrack density criterion,the results indicate that the changes of these parameters are the macroscopic characterization of the transition process from small-scale microfracture to large-scale microfracture,and from localized damage to overall damage of the original coal and coal specimens under uniaxial loading.The present study provides a new method for evaluating the damage state of raw coal and type coal under high stress conditions using acoustic emission source localization technology,which is of great guiding significance and reference value for safeguarding the safety of life and property in the process of coal resources mining.

关 键 词：单链接聚类方法 声发射b值 空间相关长度 信息熵 

分 类 号：TD323[矿业工程—矿井建设]