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介绍了液态CO_2预裂爆破增透技术原理及预裂装置。现场试验表明:预裂爆破后煤层透气性系数增大了2.0~6.8倍,预裂钻孔浓度提高1.38倍;预裂钻孔的百米钻孔瓦斯抽采量是对比孔的4.6~11.5倍。试验取得较好的效果。
Introduced the liquid CO_2 presplitting blasting anti-seepage technology principle and pre-cracking device. Field tests show that the permeability coefficient of coal seam increases 2.0 ~ 6.8 times after pre-splitting blasting and the pre-splitting drilling hole concentration increases by 1.38 times. The gas drainage volume of pre-splitting drilling holes is 4.6 to 11.5 times of that of holes . Test to achieve better results.