1Movement Rule of Overlying Strata under Extra-thick Magmatite and Its Disaster-causing AnalysisMA Fuwu, JIANG Jinquan, WU Quanlin, ZHANG PeipengTest Research1-4,92Study on Underground Hydraulic Fracturing Technology for Soft Coal Seam with Low PermeabilityLI Lei, LI Zhongjun, WU WenbinTest Research5-93Investigation and Numerical Simulation Study on Mining Effect of Double Protective SeamLUO JianjunTest Research10-13,174Experimental Study on Influence Relation between Fire Resistance and Fire Air Quantity during Mine FireTIAN Zhichao, LIU Yejiao, WANG Wencai, YANG DuoTest Research14-175Determination of Critical Gas Drainage Volume in Fully Mechanized Caving Face in Extra-thick Inflammable Coal SeamDU Haigang, FENG Shan, CHU Tingxiang, YU MinggaoTest Research18-21,266Study on Pore Structure and Fractal Characteristics of Soft CoalXU Mangui, MENG Ran, WEI Pan, HAN Jinzi, ZHANG BifengTest Research22-267Study on Influence of Thermal Stability Test on Performance of Plastic Impeller Used in Coal Mine Auxiliary FanJU GuanggangTest Research27-308Numerical Simulation Research on "Three Zones" Distribution Rule in Overlying Strata of Fully Mechanized Working Face in Upper Protective Seam with God-side Entry RetainingCHENG GuojianTest Research31-34,569Study on Surface Dynamic Behavior and Critical Surface Tension of Coal with Different Metamorphic GradesLIU Qian, GUO Yusen, LAI Yongming, LIN LuyaoTest Research35-3910Numerical Simulation Study on Cryogenic Separation of Low-concentration Coal-bed MethaneXIAO LuDevelopment Design40-4311Design and Research on Monitoring System of Ventilation Air Methane Catalytic OxidationMA DaihuiDevelopment Design44-4712Study on Application of Dust Suppression Technology by Spatial High-pressure Spray in Fully Mechanized FaceGUO Shengjun, LIU Tao, XU Ming, ZHANG SaiApplication Techniques48-51,6113Analysis of Influence of Fault Activation on Protective Coal Pillar Presetting for Surface Buildings and StructuresZHAO Bingchao, LIU Zhangrong, WANG Wenbin, FENG WenshengApplication Techniques52-5614Application of Analytic Hierarchical Process in Effect Evaluation of Gas Drainage by Holes Drilled along Coal SeamLI YunApplication Techniques57-6115Risk Evaluation of Test Holes Based on Fuzzy Comprehensive AnalysisLI Jiajun, SUN Yajun, XU Zhimin, SHAO SihuiTechnical Experience62-6516Study of Mechanical Cavity-forming Technology for Underground Gas Drainage Hole DrillingZHAO JizhanTechnical Experience66-68,7217Study on Control Technology for Fractured Karst Zone Containing High-concentration H2 S and High-pressure Karst Water in Longtan Coal MinePANG ChengTechnical Experience69-7218Further Test on Crossing Hydraulic Fracturing Technology for K1 Coal Seam in Tonghua MineDONG Guofu, HUANG Song, DENG Yongliang, HU YunTechnical Experience73-7619Gas Control Technology for First Slice Working Face of Complicated Extra-thick Coal Seam in Baijigou MineWANG HuaTechnical Experience77-79,8220Research on Optimization of Fast Exposing Gently-inclined Serious Outburst Coal Seam by a CrosscutWANG Jian, ZHANG Di, LI ZhenggangTechnical Experience80-82 