1Study on geological environment problems and countermeasures of coal mining in loess plateau of northwest China:taking Chengjiagou Coal Mine as an exampleLI Qiao-gangQuestion Discussion1-5,212Study on protection method of small unit gangue filling strip coal column based on FLAC3DLI Jiang, CHE Chi-yuan, ZHAO Chang-zheng, DU Shu-yu, SONG Yu-zhuQuestion Discussion6-113Analysis on underground disposal scheme of gangue in Hongshan MineKANG Cong-yongQuestion Discussion12-164Analysis on breaking law of anchor cable in dynamic pressure tunnel with weak interbedded composite roofWANG FengQuestion Discussion17-215Study on stability and control technology of gob-side entry retainingYUAN Jiang-longQuestion Discussion22-256Research on failure mechanism and reinforcement technology of return air flow in top-coal caving face under action of mining stressLI Zhen-maoQuestion Discussion26-307Feasibility study on upward mining of shallow close coal seamLIANG Yu-zhu, LI Nan-junQuestion Discussion31-338Optimal design of converged communication system in Hanjiawan Coal MineXU Hui-xingExperimental Study34-409Research on power balance of belt conveyor based on RBF neural network controlLIU TunExperimental Study41-43,4710Study on floor failure law of close paste filling working faceBI Zhi-qiang, SUN Kai, ZHOU Ming, SU Yan-bing, WANG Juan-juanExperimental Study44-4711Deformation and failure characteristics of coal mine roadway and optimization of support parametersMI She-liExperimental Study48-5212Supporting optimization method of+302 m auxiliary transport roadway in Jinyuan Coal MineLIU Lei, SUN Jian, ZHANG Bing-bingExperimental Study53-56,6013Research and design of the controller of hydraulic support based on PLCQIN Yi-daiExperimental Study57-6014Study on the distribution law of coal spontaneous combustion Three Zones in goaf of Xiegou Coal MineGUO Yu-feng, ZHOU Xin, LU YanCoal Safety61-65,7515Research on the optimization of coal-cutting and dust-reducing technology of coal winning machine in fully-mechanized caving faceCHEN BinCoal Safety66-6816Application of comprehensive water control technology in fully-mechanized top coal caving faceZHANG Pu-liangCoal Safety69-7117Application of underground broken wall grouting technology in shaft lining treatment of loose layersHUA Yi, LI Nan-junCoal Safety72-7518Pre-grouting treatment technology for water damage in mine floorBAI Wen-binCoal Safety76-8019Research on zero-exceeding control system of gas in high gas mineDONG Tai-huang, ZHU Chuan-jie, WANG Jun-chao, REN Jie, LIU Qian, LI Long, ZHANG Zhi-yuanPractical Technology81-86,9220Research on crack evolution law and drilling parameter optimization of stope in steeply inclined compound coal seamWANG Jun-chao, ZHU Chuan-jie, DONG Tai-hua, HU Si-jia, LIU Qian, LIU Na, LI Long, ZHANG Zhi-yuanPractical Technology87-92 