1Study on Hydraulic Fracturing Breakdown Pressure Influencing Factors for Floor Crossing BoreholeWANG Linzheng, TAN ZhihongTest·Research1-4,82Study on Gas Occurrence Laws of Libi Mine in Qinshui Coal FieldWU HaijunTest·Research5-83Numerical Simulation of CO Affecting Gas Explosion in Restricted SpaceQU Guona, WANG Jianguo, WANG Laigui, JIA BaoshanTest·Research9-12,164Numerical Study on Permeability Revolution of Coal Seams Under Isothermal Adsorption ConditionCUI Bo, XIAO Liping, ZHANG KaizhiTest·Research13-165Optimization of Gas Drainage Radius of Long Borehole in High Gas Coal Seam with Low PermeabilityZHENG Lei, WANG Xueqin, ZHANG FeitianTest·Research17-19,236Study on New Type Measurement of Drill Pipe for Drilling Gas Emission Initial SpeedZOU Yongming, ZHANG ZhancunTest·Research20-237Coal Particle Gas Desorption Experiment and Numerical SimulationYI Nuo, HAO ZheTest·Research24-26,308Experimental Study About Impact of Water's pH on Low Temperature Oxidation Characteristics of CoalMA Bucai, CHEN Youqiang, XU ShiminTest·Research27-309Research of Microscopic Difference of Deep Coal Seam Floor Mudstone Based on Water-rock InteractionHU Bingli, LIN Xiaolong, JIA Mingxu, NIE Yinping, DING YahengTest·Research31-3410Size Distribution of Mine Dust Improvement Based on Wavelength of Light Source SystemZHAO Yanjun, GAO Chengbin, FENG GuoqiTest·Research35-3711Study on Relative Aquifuge of Top Ordovician in Qinshui Coal AreaLIU Yongsheng, ZHU KaipengTest·Research38-4012Experimental Study on Influence Factors of High Concentration Cementation Filling Body StrengthCHEN Lei, LI JingTest·Research41-43,4713Research on Roadway Surrounding Rock Loose Circle Change Law Under Multiple Blasting VibrationsCHEN Ya'nan, PAN ChengTest·Research44-4714Impact Study of Stone Powder on Properties of Mine Filling Glue PowderCHEN Hongtao, HU Xiangming, CHENG WeiminTest·Research48-5115Study on Floor Heave Prevention and Control with Floor Grooving Under High Horizontal StressCHENG Zhichao, GAO Mingshi, QUAN XiucaiTest·Research52-5516Application of Tracing Channels Test in Detection of Mine Kasrt PipelineLI Xu, WEI Dandan, XU Guangquan, CHEN LiTest·Research56-59,6317Study on Damage Evolution and Aging Failure of Roadway Surrounding Rock in Jointed Rock MassXING Meng, LI Lianchong, XING YaziTest·Research60-6318Study on Multiscale Entropy Evaluation Method of Bolt Anchorage QualityZHANG Lei, MAO Xianbiao, CHEN Zhanqing, ZHAO Peng, LI ZhijianTest·Research64-6719Comprehensive Prevent and Control Technology of Gas in Baode Coal MineZHANG YongfuTechnology·Innovation68-71,7520Bolt and High-strength Anchor Cable Combined Support for Roadway at Island Coal Face Under Dynamic PressureLI Baiyi, HAO Deyong, QI Wenyue, HAN Xiaole, LAN LixinTechnology·Innovation72-75 