1Study on manifestation of ground pressure in"first square"return airway of inclined soft coal seam working faceZHANG Jiakui, LI Tie, PENG Pai, LEI Ming, LI Xiaolu, NING ShanQuestion Discussion1-82Research on spatiotemporal evolution law of purification efficiency of collapsed coal and rock mass in goaf:Taking Lingzhida Coal Mine as an exampleYANG Pengfei, LIU Kerui, WANG Dangliang, WANG Yunqing, SI Xiang, YANG DaokunQuestion Discussion9-15,203Design and study of strip paste backfill mining schemeZHANG Rui, ZHANG Ruilong, LANG PengchengQuestion Discussion16-204Optimization of coal drawing method for improving top coal recovery rate in low level fully-mechanized caving faceXING Meng, WANG PengyuQuestion Discussion21-25,325Study on overburden migration and breaking law of ultra-wide working face in deep miningZHANG Leqiang, WANG Wei, LIU Xiaotong, FENG Changru, ZHU HaoQuestion Discussion26-326Study on stability of coal pillar in ultra-high water material backfilling mining with different water volume ratiosGUO Li, ZHANG Dong, ZHANG ZhenQuestion Discussion33-36,407Development and application of coal sliding plate device between shelves in fully-mechanized caving faceHAN RuifengQuestion Discussion37-408Research on mining methods and equipment selection for large dip coal seamsZHANG Tan, CAO LiangQuestion Discussion41-45,499Analysis on water disaster control technology of broken surrounding rock in south return airway of Sangshuping Coal MineWANG MingheQuestion Discussion46-4910Design and application of hydraulic support for advance support in fully-mechanized caving face of ultra-thick coal seamGUO Pengfei, ZHOU Yubo, LI Jiangbo, SONG YongmingQuestion Discussion50-54,5811Countermeasures for coal resource utilization in Pingliang region under"dual-carbon"backgroundYAN XiaochuanQuestion Discussion55-5812Research on reserved width of coal pillar in sections based on multi-hazard factorsTIAN FaQuestion Discussion59-6413Deformation mechanism and control of roadway under close-range goaf considering changes in roof occurrenceYANG Lin, ZHANG Sheng, FU Hantao, LIU ChangExperimental Study65-70,7914Research on extra-thick coal seam mining plan and effect and economic benefits of surface grouting filling and subsidence reduction in Baiguangou Coal MineSHI Changkun, WANG Dangliang, LIU Kerui, CHEN Zhihao, MA Jin, GUO XinyuExperimental Study71-7915Design and simulation analysis of end-support robot's manipulator armSHI Huawei, HE Jiacong, LI Zhong, WANG XiaozhiExperimental Study80-84,9016Mechanical damage characteristics of structural coal particles under uniaxial loading and unloadingLIU Jie, ZHAI Yechao, ZHANG Hao, LI Zhibin, WANG Binrong, PAN RuxiaoExperimental Study85-9017Characteristics of mining pressure manifestation with paste filling in irregular multi open-off cut faceSU Lin, XU Chunhua, YU Zhenya, XU Shipeng, YUAN Bo, KONG KaiExperimental Study91-9718Research on reasonable width of protective layer coal pillars on prominent coal seam groupsCAI MinghuaExperimental Study98-102,11119Research on roof support parameters of shallow-buried deep roof cutting and pressure relief self-formed roadway watering sectionZHANG Tiejun, LI Yuhui, ZHAO YuanxinExperimental Study103-11120Discussion on experience of preventing and controlling water hazards caused by separation in Guojiahe Coal MineYAO Shilin, QIAO Wei, BAI YunpengCoal Safety112-115,120 