CAJ | 학술논문

针对低透气性高瓦斯煤层,开发了液态 CO 2深孔预裂爆破技术及装备.阐述液态 CO 2预裂爆破的机理并开展现场试验.试验表明,预裂爆破后影响半径可达12 m 以上,抽采负压最大达到13998??8 Pa；预裂钻孔及其影响范围内的抽放钻孔瓦斯浓度都有明显上升,部分钻孔抽采浓度能提高50％以上；预裂后钻孔瓦斯抽采流量显著提高,单孔最大抽采量达385??8 m3/d,累计瓦斯抽采量能达到普通钻孔累计瓦斯抽采量的2~6倍；预裂后日均瓦斯抽采量长时间维持在一个较高水平,衰减系数不到普通钻孔的1/2.
침대저투기성고와사매층,개발료액태 CO 2심공예렬폭파기술급장비.천술액태 CO 2예렬폭파적궤리병개전현장시험.시험표명,예렬폭파후영향반경가체12 m 이상,추채부압최대체도13998??8 Pa；예렬찬공급기영향범위내적추방찬공와사농도도유명현상승,부분찬공추채농도능제고50％이상；예렬후찬공와사추채류량현저제고,단공최대추채량체385??8 m3/d,루계와사추채량능체도보통찬공루계와사추채량적2~6배；예렬후일균와사추채량장시간유지재일개교고수평,쇠감계수불도보통찬공적1/2.
The technique and equipment of deep holepresplitting blasting with liquid carbon dioxide were developed for low permeability and high gas coal seams?? The mechanism of presplitG ting blasting with liquid carbon dioxide was proposed and field tests were carried out?? The experiG ments show that the influence radius of the presplitting blasting can reach to 12 m above ,the negative pressure of extraction reaches a maximum of 13998??8 Pa;the gas concentration of the drainage boreholes in the presplitting drilling and its influence scope has increased significantly, and the extraction concentration of gas in parts of boreholes can increase more than 50%;the gas extraction volume in the boreholes after presplitting significantly improved,the maximum extracG tion volume of single hole was 385??8 m3/d,and the accumulative gas drainage volume was 2~6 times the ordinary's?? after presplitting,the daily gas drainage amount maintained at a high level for a long time,and attenuation coefficient was lower than 1/2 of the conventional boreholes.