Study on Pre-splitting Blasting to Improve Permeability Drainage Rate in Heading Excavation
Aim at the problem of low excavation speed and high risk of coal and gas outburst because of low gas draining rate in heading excavation, taking an excavation heading of a mine for example, the test of deep-hole pre-splitting blasting was processed.The amount of gas draining after pre-splitting was compared to the amount of direct draining, and the effective radius of draining was surveyed.The test result showed that the draining rate of K1 coal seam reached 37.13%, which reduced the draining time by 60%, 10 days after pre-splitting, and the gas desorption index exceed the standards until the fifth blasting.The draining rate of K4 needed 12 days to reach 34.28%, which reduced the draining time by 60%, and the gas desorption index exceed the standards when the third blasting processed.Obviously, the effect of gas draining was improved by pre-splitting blasting.The effective draining radius of K1 and K4 were 4.5 m and 5.2 m respectively after pre-splitting blasting.
coal mine,heading excavation pre-splitting blasting draining radius
Wang Hong-tu Fan Xiao-gang Yuan Zhi-gang Xu Hou-xue
State and local joint engineering laboratory of methane drainage in complex coal gas seam, Chongqing Key Lab for Exploitation of China Southwestern Resources & Environmental Disaster Control Engineerin
国内会议
重庆
英文
72-76
2011-11-01（万方平台首次上网日期，不代表论文的发表时间）