1Optimization of early prediction index for spontaneous combustion of gassy coal seam in Jianbei Coal MineWEN Hu, GUO Ximan, ZHANG Duo, CHENG Xiaojiao, WEI Gaoming, TANG RuiTest Research1-82Experimental study on mechanical properties of similar material in collapsible loessZHAO Bingchao, MA Yunxiang, GUO Yaxin, SUN Hao, WANG Jingbin, WANG HailongTest Research9-143Research on catastrophe mechanism and stability control of surrounding rock of large cross section roadway under the influence of tectonic stressCHEN Dingchao, WANG Xiangyu, ZHAO Xiangqian, LI Guanjun, ZHANG FeitengTest Research15-19,254Numerical simulation and experimental verification of respirable dust virtual impact separatorLI Yanzhu, WANG Jie, XIE ShuangTest Research20-255Laboratory research on early warning of collapse and instability based on rock micro-fracture evolutionYANG Gui, CHEN Shiwan, YU Qi, YANG GenlanTest Research26-336Study on preparation and characteristics of gel foam for preventing fireLI Fanglin, ZHANG Leilin, WEI JianTest Research34-387Influence of vibration frequency on permeability characteristics of coal containing gas and model verificationCAO Weiwei, WEN Xin, ZHANG Xiaobin, HONG XuediTest Research39-448Intelligent coal and gangue identification algorithm embedded in dilated convolution and batch normalization moduleGUO Yongcun, ZHANG Yong, LI Fei, YANG PengApplication Techniques45-509Application of hydraulic flushing in hole technology in cross-cut coal uncovering of antireflection and extraction promotion in outburst coal seamTAN Jiagui, LI Kexiang, ZHANG Maoyuan, GUO Jianzhong, SHENG Zhuwen, SUN Jing, CHEN YongApplication Techniques51-55,6110Research and application of mixed gas source identification technology based on stable isotopeLIANG Wenxu, LI Jiangtao, FU Wei, ZHANG YangApplication Techniques56-6111Application of "solid, liquid and gas" trinity fire prevention and extinguishing technology in gassy environmentLU Hao, HE Qilin, LI Jinliang, LU WeiApplication Techniques62-6612Evaluation and classification of open pit slope and slope angle optimization by MSARMA method under blasting vibration conditionTAO Zhigang, LUO Senlin, MING Wei, CAO Hui, YU Haoran, HE ManchaoTechnical Experience67-75,8313Evolution of gas transportation storage area and directional borehole drainage technology in ultra-thick coal seam with fully mechanized caving miningZHANG Wenqi, ZHANG Xingwen, SUN Liuyong, WEI Zongyong, SHUANG Haiqing, XU Peiyun, LIN HaifeiTechnical Experience76-8314Determination of sensitive index for prediction of coal outburst risk in Chiyu Coal MineZHANG Yilong, WU Yan, FANG Shuhao, LIAO Qi, YANG Yinchao, ZHU HongqingTechnical Experience84-87,9315Technology and engineering practice of borehole cavitation inducing outburst based on coal and gas outburst energy theoryCEN Peishan, TIAN Kunyun, WEI Erjian, LIU SongTechnical Experience88-9316Study on the development height of "two zones" of coal seam roof based on parallel electric methodCAO Shiyou, DONG Fangying, CHENG Wenju, XIE Ruibin, SHI PengchengTechnical Experience94-10017Antireflection technology of hydraulic fracturing of low permeability and gassy coal seam in complex tectonic beltSHI Xiaohong, ZHAO Lipeng, LI Juntang, WANG Rujiang, WU CaifangTechnical Experience101-10618Study on transient electromagnetic response law of geological anomaly in Xishan mining areaLIU ZhimingTechnical Experience107-112,11719Detection of hydrogen sulfide in coal mine based on laser absorption spectrometryHE An, CHEN Yaxi, GUO Jingyuan, HU Xuejiao, JIANG HaifengTechnical Experience113-11720Comprehensive evaluation of environmental pollution control effect in coal mine subsidence area —taking Dongtan mining area of Yanzhou Mining Industry as an exampleGUO Pengyuan, HAN XiuyanIssue Discussion118-124,130 