关键词: 瓦斯抽采, 预裂爆破, 二氧化碳致裂器, 煤层增透技术

Abstract: Carbon dioxide splitter for coal seam permeability fracturing technique is a kind of liquid carbon dioxide gas based on expanding new relieving stress and improving permeability technology,reasonable blasting hole spacing is help for reducing the cost of blasting.Taking 1302 working face in Guojiahe Coal Mine as the study example,in order to determine the reasonable borehole spacing of the pre-splitting blasting of the working face,the field test is adopted,the test of the sample with different hole spacing of 2.5,3,3.5,5 m is carried out.The study results show that the smaller of the borehole spacing the higher pure extraction amount and concentration of gas,when the borehole spacing is reduced to 3 m,the influence of reducing the borehole spacing to gas extraction effects is not significant.Therefore,based on the above discussion results,the reasonable borehole spacing is 3 m.

Key words: Gas extraction, Pre-spitting blasting, Carbon dioxide splitter, Coal seam permeability fracturing technique