1Several important issues in overall planning of coal mining areaWANG He-deDesign Technology1-42Determination of coal pillar width for working face in deep-buried coal seam with strong rockburst hazardSHI Chao-hong, SU Shi-jie, DING Guo-li, YU Hui-hua, XIE Jia-HaoDesign Technology5-93Chain-saw slitting for roof cutting and pressure releasingLIU Jin-rong, YAO Qiang-ling, JIA Yuan, MA Jun-qiang, XIA ZeDesign Technology10-134Application of trackless transportation in mine constructionZHAO Chang-hong, LV Zhao-haiDesign Technology14-185Design and realization of intelligent system of coal mine UAVHOU GangDesign Technology19-236The key geological problems and geological security of secondary utilization of coal mine resources in ShanxiLIU Han-bin, YANG Yu-jing, CHENG Fang-qinDesign Technology24-287Overview of unmanned mining trucks in open-pit mineLI Qing-ling, ZHANG Hui-xiang, ZHAO Xu-yang, XU Mao-zhouDesign Technology29-348Mechanical performance of plug-in splicing joints of steel box columnZHANG Zhen-yu, WANG Zhi-jie, LIU Yan-dong, LIU Jian-kangDesign Technology35-409Variation of shaft wall force during the sinking of VSM caissonBIAN Chao, FENG Xu-hai, WANG Jian-pingConstruction Technology41-4710Influence of roof cutting pressure releasing on coal pillar stability under secondary disturbanceZHANG Jin-gui, PU Shi-jiang, YAN Ya-nan, GUO Kai, CHENG Zhi-heng, SHI Ying-shuangConstruction Technology48-5311Width of stress relief zone in tunneling face and its main controlling factorsMA Jin-kuiConstruction Technology54-5912Sealing technology of thin layer rapid spraying for easily weathered surrounding rockZHAO Bin, WANG Peng-weiConstruction Technology60-6413In-polygon borehole layout for rock cross-cut uncoveringLIU Jun, ZHANG Lu-wei, YANG TongConstruction Technology65-6914Improvement of lump coal rate in fully-mechanized mining face of Yifeng Coal MineWANG Jian-hu, ZHOU An-ning, SHAO Xiao-ping, SHI Xiu-bao, LI MingProduction Technology70-7315Integrated active-passive wave velocity inversion and early warning technology for rockburst in deep mine working faceGUO Lin-sheng, LI Cheng-hai, WANG Ji-chao, ZHAO Hui-jie, GONG Si-yuan, MA Zhi-fengProduction Technology74-7916Comparison on the effect of three pressure relief schemes in near-vertical coal seamCHANG Bo, WANG Jian, LI Kang, YAN Rui-bingProduction Technology80-8417Application of hydraulic permeability-enhancing in gas extraction of broken soft coal seam in XinjiangWANG Zheng-shuaiProduction Technology85-8918Application of hydraulic fracturing and aggregate injecting for permeability enhancement in underground coal mine gas extractionCHEN Jian, JIA Bing-yi, DONG Rui-gang, SUN Si-qing, ZHAO Ji-zhanProduction Technology90-9419Dynamic control of gas in fully mechanized top coal caving face under hard roof in extra-thick coal seamHUANG Xu-chaoProduction Technology95-9820Method for mapping cast blasting stockpile morphology based on drone oblique photographySUN Jian-dong, CHEN Xu, ZHOU Yu, WANG Tao, LIN Yu-qi, LI Fang, YU Xin-xin, LIU XinResearch and Discussion99-105 