1Study on Design Method of Gangue Transportation System in Solid Backfilling Coal MiningGONG Shou-cai, ZAN Dong-feng, LIU Zhi-chengDesign Technology1-52An overview on the Design of Xiaobaodang No. 1 Coal MineZHANG LeiDesign Technology6-103Size Optimization of Narrow Coal Pillar in Fully Mechanized Caving Face under Short Distance GoafDU Jiang-taoDesign Technology11-144Experimental Study on Vibration of Large Cage Hoisting System in Hongqingliang MineYU Gong-jiangDesign Technology15-205Research on the Auxiliary Transportation Reconstruction Scheme in Dongjiang MineREN Xiao-liDesign Technology21-256Economic Benefit Analysis of Air Compressor Waste Heat Recovery System of Xingtai Coal MineBAO Ling-ling, WANG Zi-yong, ZHAO YangDesign Technology26-297Optimization of Cast Blasting Step in Second Mining Area of Heidaigou Open-pit Coal MineCHEN Jia-peng, LI Dong-wei, CHEN Shi-pingDesign Technology30-348Design and Experimental Analysis of Mine Energy-saving Two-stage Vibrating ScreenWANG An, MA Ning, FU Jia-xingDesign Technology35-399Study on Supporting Technology for Gob-side Entry Retaining with Flexible Formwork Concrete When Crossing Collapse ColumnJIA Niu-jun, YAN Jun-jie, QIU Yong-fang, LEI Ping-boConstruction Technology40-4310Study on Breaking Mechanism and Supporting Technology of Surrounding Rock along Roadway of Fully Mechanized Caving FaceGE Su-liang, ZHANG Jiang-boConstruction Technology44-4811Field Test Study on Bolt Prestress of Coal Mine RoadwayZHANG JianConstruction Technology49-5212Study on Permeability Enhancement Technology through Overall Hydraulic Fracturing of Long Directional Hole in Zhaogu No. 2 Coal Mine Mining Coal SeamLI Guo-dong, ZHENG Kai-ge, CHEN Dong-dongConstruction Technology53-5713Analysis and Application of Shotcrete Equivalent Thickness Based on Lame SolutionLI Feng-hui, CHENG Yun-hai, GU Yu-ming, HE Jian-bin, ZHANG JianConstruction Technology58-6114Study on Adaptability of Two-Pillar Shielded Top-coal Caving Support in Fully Mechanized Top-coal Caving Face of Extra-thick SeamCHEN Guo-qiang, WEN Rong-feng, WANG Wen-xiaoPreduction Technology62-6615Classification Research of Rib Spalling Risk Area in High Caving Face of Loosen Soft SeamKONG Xiang-yi, CHEN Quan-qiu, CUI KaiPreduction Technology67-7116Support Back-ward Retracing Technology for Fully-mechanized Working Face in Close Distance Coal seamLI Zhi-jiePreduction Technology72-7517Development Characteristics and Main Control Factors of Karst Collapse Column in Kailuan Fangezhuang Mine FieldCHANG Yong-qiangPreduction Technology76-7918Application of High Energy Pulsed Laser Technology to Online Detection of Coal QualityZHAO Yong-gang, YANG Chuan-bo, JI Shu-chun, HU Xiao-pingPreduction Technology80-8319Analysis of Elastic Shape of Surrounding Rock in Circular Roadway Based on Bolt Reinforcement EffectGU Shuan-cheng, LI Xiao-dong, ZHOU Pan, HU Xiao-kaiResearch and Discussion84-8820Study on Prestress Bolt Diffusion Mechanism and Application of Composite RockLI Chao, GONG Pei-linResearch and Discussion89-92 