1Construction Technology of Mine Air Return Shaft Permanent Collar and Ventilation Adit Pile Wall Combination during Mine Shaft Sinking PeriodJIA Zhengang, HU Guobao, LI Zhiqiang, LI Xiaobo, XU Hongbo1-3,132Safety Drilling of Freezing Holes and Sealing Technology of Water Flowing Channel in Hulusu MineTIAN Le4-7,603Prevention and Control Technology of Floor Heave Occurred in Seam Gateway of Shuanglong Coal MineZHANG Weiguo8-9,474Directional Drilling Technology Applied to Construction of Surface Pre-grouting with S HoleTIAN Weipeng, WANG Zhixiao, ZHANG Shimin10-135Prediction on Mine Water Inflow from First Coal Mining Face of Deep Jurassic Coalfield Mine in Huji Erte Mining AreaWU Yonghui14-186Carbon Dioxide Cracking Technology Applied to Coal Bunker Heading in Mine Shaft BottomHUANG Baolong19-217Analysis on Radial Displacement of Freezing Wall in Deep Thick Clay Stratum and Regulating Mechanism of Excavation Section Height Applied to Construction of West Ventilation Shaft in Zhaogu No.2 MineZHANG Daohai, CHANG Jianxin, WANG Heng, ZENG Fanyi22-26,308Layout Design of Construction Facilities for Shaft Sinking of Two Mine Shafts with Closed Distance in Limited SiteWANG Gaixia, JIA Zhengang, MIAO Fengfeng, WANG Yan27-309Experiment Study on Acoustic Emission Characteristics of Weak Cementation Sandstone with Different Partical Size under Uniaxial LoadingSONG Chaoyang, TAN Jie, WANG Yezheng, LIU Bing31-3510Optimized Study on Narrow Coal Pillar Width of Gateway Driven along Goaf in No.8263 Coal Mining Face in Yangdong MineZHANG Wencai, SUN Lihui36-4011Mechanism and Prevention of Water Inflow and Sand Gushing in Mine ShaftPANG Shijie, QIAN Ziwei, CAI Fenghua, YAN Guocheng41-4412Discussion on Drilling Technology of Curve Type Freezing HoleWANG Qiang, HAN Yunlong, LIU Jie, ZHANG Song45-4713Discussion on Optimization of Development Design for 1000 m Depth Mine Shaft in Xinji Mining AreaHUANG Chaochao48-52,5714Calculation Analysis as well as Deviation Correction and Reinforcement Design on Oar Type Box Mode Leaning HeadframeJIA Zhaoyuan53-5715Ultra Large Headframe Applied to Construction of Mine Large Cross Section ShaftWU Zhijuan58-60 