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针对高突矿井低透气煤层瓦斯“零”超限治理需要,采用理论计算、现场试验方法研究了深孔预裂爆破影响半径,通过现场瓦斯抽采流量及浓度监测对比分析深孔预裂爆破增透作用效果。结果表明:深孔预裂爆破粉碎区理论半径可达4.0~6.3 m,裂隙区理论半径可达7.8~12.1 m,现场试验深孔预裂爆破影响范围大于9 m,爆破增透抽采效果与距离爆破孔的距离呈反比趋势;深孔预裂爆破技术可最大提高瓦斯抽采量9.27倍,平均提高瓦斯抽采量4.96倍,可有效提高煤层瓦斯抽采效率。
In view of the need of gas “zero ” overrun control in high permeability coal mine with low permeability coal seam, the influence radius of presplitting blasting in deep hole was studied by theoretical calculation and field test. By comparing the flow and concentration monitoring of gas drainage in the site, Explosion enhanced by the effect. The results show that the theoretical radius of presplit blasting in deep-hole can reach 4.0-6.3 m, and the theoretical radius of fractured zone can reach 7.8-12.1 m. The influence range of deep-hole presplitting blasting in field test is more than 9 m. The distance from the blasting hole is inversely proportional to the trend; deep-hole presplit blasting technology can increase the maximum gas drainage 9.27 times, an average of 4.96 times higher gas drainage, which can effectively improve the gas drainage efficiency of coal seam.