Application study on deep borehole pre-cracking blasting for permeability improvement to uncover seam in mine shaft
In order to increase the coal seam permeability and the rate of gas extraction, then eliminate the outburst danger, this article by the method of theoretical study and numerical simulation, to study the deep borehole pre-cracking blasting applied in the low permeability and high gas coal seam, then the test pointed out the coal and rock mechanics properties and the guiding role of control hole.By means of numerical simulation of stress nephogram and fracture Fig.for two blasting holes and control hole, recreating the propagation and attenuation law of stress wave in the rock, and the expansion process of the coal cracks.Finally, the test of deep borehole pre-cracking blasting was done in 13-1 seam in Xieqiao coal mine, and the test effect was ideal.The technology significantly increases the permeability of coal and improves the extraction concentration and volume, which is a positive and feasible scheme to prevent the outburst of low permeability and high gas coal seam.
deep borehole pre-cracking blasting low permeability coal seam pressure relief and permeability improvement blasting crack numerical simulation
TANG Jing LE Qian QIAO Wen-ming CHEN Yan-ping
School of Mining and Safety, Anhui University of Science and Technology, Huainan 232001, China
国际会议
International Mining Conference 2014(2014国际采矿论坛)
安徽淮南
英文
381-387
2014-09-19（万方平台首次上网日期，不代表论文的发表时间）