1Experimental Study on Coal Seam Gas Degradation by Microorganism Under Different Pressure and Oxygen Environment ConditionsZHANG Ruilin, REN XueqingTest·Research1-42Foam Drilling Technique by Gas Extraction Drilling Long Borehole in Soft Coal SeamYIN Xinsheng, LIU Jianlin, LIU YongTest·Research5-83Study on New Type Borehole Sealing Device and Process for Coal Mine UndergroundLI Enfu, WEN Zhihui, DAI ShaohuaTest·Research9-11,154Quantitative Characterization of Coal Structure and Its SignificanceWANG Peng, SU Xianbo, HAN Ying, FAN Chao, ZHANG YuezhengTest·Research12-155Experimental Study on Gas Desorption Law of Coal by Seal SamplingLIU Xianglong, CHEN ShaojieTest·Research16-18,226Influencing Factors of Coal Spontaneous Combustion Period in ExperimentalWEN Hu, ZHAO Yanhui, ZHAI Xiaowei, WANG KaiTest·Research19-227Numerical Simulation on Influence of Nitrogen Injection on Goaf Oxygen DistributionCHEN Xiaokun, ZHANG Huawei, ZHAI Xiaowei, ZHAO Yanhui, WANG DongTest·Research23-268Optimal Selection for Gas Prediction Index of Coal Spontaneous Combustion Under Different Conditions of Oxygen ConcentrationJIN Yongfei, LI Haitao, YUE Ningfang, YUAN LinTest·Research27-309Experimental Study on Influence of Gas on Characteristic Parameters of Coal Spontaneous CombustionDENG Jun, LI Peng, CHENG Wendong, YUAN Lin, YAO FeiTest·Research31-33,3710Influence of Air Flow on Spontaneous Combustion Characteristics of Residual CoalQIN Yueping, XU Shimin, QIAO Ting, LI YuqianTest·Research34-3711Evolution Laws of Water Flowing Fractured Zone Height at 8101 Working Face in Tai'an Coal MineZHENG Jianbin, XIE Wenbing, JING Shengguo, HUA JunTest·Research38-40,4412Numerical Simulation of Gas Outburst due to Roof First Weighting at Fully Mechanized Caving FaceZHANG Jijian, LIU Yingke, CUI Guanglei, ZHOU FubaoTest·Research41-4413Shallow Overburden Rock Fracture Zone Development Law Under Many Mining ConditionsTIAN Chenglin, NING Jianguo, TAN Yunliang, WANG Jun, SUN Bi, QIAN KunTest·Research45-47,5214Experimental Study on Resistivity Variation Laws of Coal Containing Gas Under Uniaxial CompressionZHU Yafei, WANG Enyuan, LIU Zhentang, CHEN Peng, YANG Yulong, FENG JunjunTest·Research48-5215Fracture Effect of Coal Permeability Changes in Stress Concentration BeltTAO Tao, CUI HongqingTest·Research53-5616Reasonable Working Resistance Determination of Hydraulic Support Based on Key Strata TheoryLI Yong, ZHANG Yuan, LI WeiTest·Research57-59,6317Influence of Sandstone Layer Coefficient in Coal Overburden on Mining SubsidenceSONG Shijie, ZHAO Xiaoguang, WANG ShuangmingTest·Research60-6318Underground Effect Examination of Ground Borehole Fracturing in Coal Mining AreaZHANG Haijun, YUAN Dequan, MA QianqianTest·Research64-6719Damage Mechanism of Clear Water Drilling Fluid on Coal Reservoir in Qinshui BasinCHEN Jun, MA Xuan, YUE Qiansheng, BAI Chaofeng, JIANG Guangzhong, TIAN Zhonglan, YANG HenglinTest·Research68-7120Study on Deep-hole Pre-splitting Blasting Hole Sealing TechniqueLIU Sijia, WANG Zhiya, ZHAO RongkuoTechnology·Innovation72-73 