1Study on rheological characteristics of inorganic thixotropic fire extinguishing gel for blocking air leakage of coal mineHAN Fuzhi, SHAO He, SI Junhong, ZHANG JunTest Research1-72Study on strata stress and deformation response of contiguous seams under cutting roof for entry retainingYANG Hongyun, LIU Yanbao, LI Yong, PAN Ruikai, WANG Hui, CAO ShugangTest Research8-13,193Characteristics of temperature field variation during sandstone crack developmentTIAN Feng, SUN Hai, MA Liqiang, HAN Jie, CHEN Mimi, DU Yuanyuan, FU Yu, WANG FeiTest Research14-194Study on evolution law of coal wetting range around high pressure hydraulic "cut-pressure"borehole in steep extra-thick coal seamLIU Xudong, FAN Jiuyuan, WANG Gang, JU Shuang, MA ZujieTest Research20-265Model construction and characterization comparative study of Bijie and Longyan anthracites structureFENG Zhizhong, YAN GuochaoTest Research27-336Study on influence of coal seam parting on stability of roadway surrounding rockZHANG Kangning, LI MingTest Research34-417Experimental study on infrared measurement of heat source temperature in goafSHEN Yanan, ZHANG JiayongTest Research42-468Study on pore characteristics of acidified coal samples based on low field nuclear magnetic resonance technologyXIONG Jianlong, WANG Kai, DU Quanxian, MENG Xiangchang, GUO BingbingTest Research47-529Study on the development characteristics and height of"three zones"of the working face covered with thick alluvium and weak overburdenLIU Chaojie, GAO Yunzeng, ZHAO Gaobo, LI ShaoxiongTest Research53-5810coal seam group with high gas contentZHANG YuleiTest Research59-6411Study on classification and discrimination of water inrush risk in Taiyuan limestone aquifer based on multivariate analysisXU Haitao, FENG Jicheng, YIN Shangxian, LIU BenchongTechnical Experience65-7012Prediction assessment of ground pressure risk based on combination weight and set pair analysisYUAN Haiping, ZHANG Yu, XIONG Lijun, CHEN Chen, YU XiangjieTechnical Experience71-7613Research and development of abandoned coal mine gas resource information management cloud platformHAO Tianxuan, ZHAO LizhenTechnical Experience77-83,8914Study on stability control technology of large section open-off cut in thick alluvium and thin bedrockLIU Shifeng, GUO PengTechnical Experience84-8915Practice of fire prevention and control in fully mechanized working face of composite coal seam prone to spontaneous combustion in positive pressure ventilation mineREN XiancaiTechnical Experience90-93,9916Distribution features of spontaneous combustion"three zones"in goaf of Xiaozhuang Coal MineSHANG Weiwei, ZHANG Fei, LUO Huagui, WANG Ning, LI BinTechnical Experience94-9917Analysis of the operation condition of the liquefaction distillation column of low concentration coalbed methaneXIAO LuIssue Discussion100-103,10818Research and thinking about coal gangue backfilling technologyYANG ChangjunIssue Discussion104-10819Study of influential factors and paths of the mine manager' s safety awarenessCHEN Tiehua, LIU Jingpin, LI Hongxia, WANG HongliangSafety Management109-113,12020Application of HAZOP-LOPA coal mine safety risk assessment method based on Bayesian networkZHANG Jinggang, WANG Qingyan, ZHAO ShufengSafety Management114-120 