不同层理煤破坏过程声发射RA-AF特征研究  

RA-AF characteristics of acoustic emission in uniaxial compression failure of different bedded coal

作　　者：李漾 刘洋[1,2] 丁翠 李振雷 张修峰 丁小平 LI Yang;LIU Yang;DING Cui;LI Zhenlei;ZHANG Xiufeng;DING Xiaoping(School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;China Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine,University of Science and Technology Beijing,Beijing 100083,China;School of Safety Engineering,China University of Labor Relations,Beijing 100048,China;Shandong Energy Group Co.,Ltd,Jinan 250014,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [3]中国劳动关系学院安全工程学院,北京100048 [4]山东能源集团有限公司,山东济南250014

出　　处：《煤矿安全》2022年第1期37-43,共7页Safety in Coal Mines

基　　金：山东省重大科技创新工程资助项目(2019SDZY01、2019SDZY02);中央高校基本业务费专项资金资助项目(21ZYJS012)。

摘　　要：为研究不同层理煤破坏声发射RA-AF特征,开展了0°、30°、60°、90°层理夹角煤单轴压缩破坏试验,同步采集了煤体力学和声发射数据,分析了RA-AF特征与裂纹扩展模式的关系。结果表明:第Ⅰ和第Ⅱ阶段,声发射计数水平较低,第Ⅲ阶段,计数值逐渐增加,在第Ⅳ阶段,α=0°和60°时,声发射计数更多,峰值较高;α=0°和90°时,张拉破坏占比分别为58.44%和58.06%,裂纹以张拉破坏为主;α=30°时,张拉剪切破坏占比相当,裂纹表现为张剪复合破坏;α=60°时,试样剪切破坏占比68.14%,裂纹以剪切破坏为主。In order to study the characteristics of RA-AF of coal failure in different coal bedding,uniaxial compression failure experiments of coal with 0°,30°,60°and 90°bedding angles were carried out.The mechanical and AE data of coal body were collected synchronously.The relationship between the characteristics of RA-AF and crack propagation mode was analyzed.The results show that:in theⅠandⅡstages,the AE count level is low,in theⅢstage,the AE count is gradually increased,in theⅣstage,whenα=0°and 60°,AE counts are more and the peak value is higher;whenα=0°and 90°,the tensile failure ratio is58.44%and 58.06%,respectively,and the tensile failure is the main crack;whenα=30°,tensile failure and shear failure are the same,and the crack appears as tensile shear composite failure;whenα=60°,the shear failure ratio of the sample is 68.14%,and the shear failure is the main crack.

关 键 词：煤层理 声发射 RA-AF特征 单轴压缩破坏 裂纹扩展模式 

分 类 号：TD315[矿业工程—矿井建设]