Effectiveness analysis of methane-drainage by deep-hole controlled pre-splitting blasting for preventing coal and gas outburst  

作　　者：CAO Shu-gang LI Yong LIU Yan-bao ZHANG Li-qiang XU A-meng 

机构地区：[1]Key Laboratory for Exploitation of Southwest Resources and Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing 400044, China [2]Safety Engineering College, North China Institute of Science and Technology, Beijing 101601, China

出　　处：《Journal of Coal Science & Engineering(China)》2009年第2期166-170,共5页煤炭学报（英文版）

基　　金：Supported by Project from National Natural Science Foundation of China(50674111);the National key Technology R&D Program in 10th Five Years Plan of China

摘　　要：In the study of the application effectiveness of deep-hole controlled pre-splittingblasting technology,it was found through laboratory micro test and field study on a mine insouth China that under the technology,coal masses produce many irreversible cracks.Afterblasting,the nearer the distance from blasting hole,the larger the BET surface areaand volume ratio of the infiltration pore are;they increased by 11.47%and 5.73%,respectively.The coefficient of air permeability is increased 4 times.After 3 months,the gasdrainage rate was increased by 66%.In the first 15 days,the cumulative pumped gas was1.93 times of blasting before.The average absolute gas emission decreased by 63.46%.Experimental results show that deep-hole controlled pre-splitting blasting not only preventscoal and gas outburst,but also gives good economic results.In the study of the application effectiveness of deep-hole controlled pre-splitting blasting technology, it was found through laboratory micro test and field study on a mine in south China that under the technology, coal masses produce many irreversible cracks. After blasting, the nearer the distance from blasting hole, the larger the BET surface area and volume ratio of the infiltration pore are; they increased by 11.47% and 5.73%, respectively. The coefficient of air permeability is increased 4 times. After 3 months, the gas drainage rate was increased by 66%. In the first 15 days, the cumulative pumped gas was 1.93 times of blasting before. The average absolute gas emission decreased by 63.46%. Experimental results show that deep-hole controlled pre-splitting blasting not only prevents coal and gas outburst, but also gives good economic results.

关 键 词：coal and gas outburst methane-drainage pore structure deep-hole controlled pre-splitting blasting 

分 类 号：TD235.4[矿业工程—矿井建设] TD713