1Effect of Number and Blockage Ratio of Obstacles on Gas ExplosionYANG Chunli, LI XiangchunTest·Research1-32Test on Methane Desorption Characteristics Under Different Temperature and Water Injection PressureWANG Lu, FENG Zengchao, ZHAO DongTest·Research4-73Measurement Effective Drainage Radius of Borehole Based on" the Drainage and the Pressure Measurement" Pressure Dropped MethodZHANG Shujin, WEI Guoying, HUANG Zhipeng, LI HuiTest·Research8-10,144Experimental Study on Influence of Granularity and Flow Rate of Water Mist on the Lowest Explosive Limit of GasXUE ShaoqianTest·Research11-145Research on Sealing Length of Integration Layer-through Borehole for Hydraulic Fracturing and Gas ExtractionGAO ZhenyongTest·Research15-186Numerical Simulation on Permeation Laws of Grouting in Coal and Rock FractureZHANG Chao, LI Shugang, ZENG Qiang, LIN HaifeiTest·Research19-22,267Characteristics of Wavelet Packet Energy Spectrum by Micro-seismic Activities of Coal Samples Under Shear TestsWANG Hongdong, ZHANG YuguiTest·Research23-268Nanoscale Pore Structures of Medium and High Rank Tectonic Deformed Coal and Their Influence on Methane AdsorptionXU Haifei, PAN JienanTest·Research27-30,349Influence of Heavy Calcium Carbonate on New Type of High Water Filling MaterialWANG Cheng, HONG Zijie, XIONG Zuqiang, HAN YafengTest·Research31-3410Testing Study on Similar Material Simulation for Skip Tailings Paste Backfill MiningKONG Kai, ZHANG Baoliang, PU Zhiqiang, LYU XuegangTest·Research35-37,4111Stress Field and Displacement Field of Gob-side Entry Driving Surrounding Rock in Residual PillarXU Jun, SHEN Wenlong, LI Sichao, YAN DongTest·Research38-4112Interaction of Freezing Shaft "Two-wall" in Cretaceous StrataTIAN Yingguo, YANG Gengshe, LI Borong, ZHENG XuanrongTest·Research42-4513Crack Development and Interconnected Characteristics of Closely Spaced Shallow Coal Seams Under Overlapping MiningWEN Hu, YU Zhijin, ZHAI Xiaowei, LIU Leizheng, ZHAO JingyuTest·Research46-49,5314Study on Rational Staggered Distance at Combined Mining Face of Close Distance Coal SeamsJIA Jiantuan, PENG Jian, BAI HongxiTest·Research50-5315Increased Scheme Comparison and Stability Study on Dump SlopeWANG Sheng, ZHAO XueTest·Research54-5616Study on Failure Mode of Overburden Under Mining and SeepageGUO Dongliang, ZHAO Deshen, LIU Lei, HU Tao, WANG YunpingTest·Research57-60,6417Technology on Coal and Gas Outburst Prediction with Gas Flow in Layer-through BoreholeZHOU Rui, YAN Binyi, YAN XunqiangTechnology·Innovation61-6418Prevention and Control Technology of Flow Disorder in Intake Shafts in WinterNIE Baisheng, GUO Jianhua, WANG Chunliang, SU Shilong, ZHAO BiTechnology·Innovation65-6919Key Technology for Controlling Fire Zone of 1192 Closed Mining Face in Tunbao MineWANG Xudong, WANG Deming, SI Weibin, CHEN Jianqiang, CHANG BoTechnology·Innovation70-72,7620Two-band Height Observation of Gaotouyao Coal Mine 2-3 Coal Seam and Safety Mining Under WaterYANG Yong, SUN QianfangTechnology·Innovation73-76 