1Simulation Study on Floor Destruction based on Principal Stress Characterization ParametersWANG Zonglin, WU Pengfei, LIANG Bing, LI Gang, WANG Junguang, ZHANG TaoTest Research1-52Experimental Study of Adsorption Efficiency to SO2-4 in Abandoned Mine Water by Sandy SoilWU Aijing, ZHANG Yongbo, ZHENG Qiang, YANG Junyao, ZHANG ZhixiangTest Research6-9,143Analysis of Roadway Back Hot and Its Influencing FactorsLIU GuipingTest Research10-144The Numerical Simulation of Hanging Position of Local Ventilator in Driving FaceWANG Wencai, DENG Lianjun, ZHANG Zhihao, ZHANG Wei, CHEN YangTest Research15-19,245Fracture Characteristics and Mining Height of Overlying Strataunder Water Rich Extra Thick Sand ConglomerateLI Xiaojiang, WANG Zhen, LOU Fang, JIA YongyongTest Research20-246Gas Adsorption Characteristics of Coal Affected by Surface Acid ModificationMA YongyuanTest Research25-287The Application Research on Dust Removal Technology of High Efficiency Water StemmingPENG Jianping, ZOU ChangfuTest Research29-318Simulation Study on Mechanical Response of Surrounding Rock in Rock Cross-cut Uncovering in Changcun Coal MineZHAO TaoTest Research32-369Application and Effect Analysis of Acoustic Emission Prediction Technology in the Process of Rock Cross-cut UncoveringHU JieApplication Technology37-4210Prediction of Gas Emission based on Principal Factor Analysis and Improved BP Neural NetworkZHOU Xihua, SUN JiazhengApplication Technology43-47,5211Numerical Simulation and Engineering Application of Yielding Control Supporting in Soft Rock Roadway of 1000 m Deep WellHUANG Qingfeng, KANG Shusheng, HE Xingyi, LI FaxiApplication Technology48-5212Distinguishing the Sources of Water Inrush in Zhuji Coal Mine by Hydrochemical CharacteristicsZHANG Shuying, HU Youbiao, JU QidingApplication Technology53-5613Application of Carbon Dioxide Induced Cracking Technology in 212 Transport of Rock Cross-cut Uncovering in Jinjia Coal MineXU Shiqing, SUN Wei, WANG Mingzhong, YANG Yu, SHI Kai, REN Siwei, ZHANG ShushengApplication Technology57-6014Migration Law and Controlling Technology for Hydrogen Sulfide in Fully Mechanized Excavation FaceJIA Baoshan, WANG Hongda, JIA NiujunTechnical Experience61-6515Design of Monitoring System of Coal Mine Safety based on Multi-network Integration and LinkageXU Chuang, HE QingsongTechnical Experience66-6816Nonlinear Model of Gas Seepage in Gentle Inclined Thick Coal Seam and Optimal Design of Extraction DrillingHUANG XuemanTechnical Experience69-72,7817The Key Parameters Optimization of High Level Gas Drainage Roadway in Extra Thick and High-gas Coal SeamsZHOU Xihua, ZHOU Xiaomin, GUO XiaoyangTechnical Experience73-7818Cause Analysis and Treatment Technology of Gas Overlimit in Close Range Rock DrivageLIU Jun, LI Boying, WU JinqiTechnical Experience79-82,8719Research on the Lagging Water Inrush Caused by the Hidden Fault Affected by Coal Mining on the FloorZHANG WenzhongIssue Discussion83-8720Environmental Problems and Countermeasures of Legacy Abandoned Mine under the Background of Ecological Civilization ConstructionWANG ShihuIssue Discussion88-91,96 