斜沟煤矿液态CO_2相变致裂增透技术试验研究
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摘要
为了提高斜沟煤矿的瓦斯抽采效率,提出采用液态CO_2预裂增透技术对原始煤体进行预裂爆破。研究结果表明:斜沟煤矿18205工作面爆破孔的合理间距为7 m;钻孔爆破后,预裂钻孔百米钻孔瓦斯流量平均为0.029 m~3/min·hm,相比于未预裂钻孔的百米钻孔瓦斯流量0.01 m~3/min·hm0.0613 m~3/min、而未预裂钻孔抽采量仅为0.023 m~3/min,预裂钻孔抽采量比未预裂钻孔抽采量提高了2.66倍。
In order to improve the gas drainage efficiency of the Xiegou coal mine, the pre-splitting blasting of the original coal body was proposed by liquid CO_2 pre-cracking and anti-reflection technology. The results show that the reasonable spacing of the blastholes in the 18205 working face of the Xiegou Coal Mine is 7 m; after the drilling and blasting, the average gas flow rate of the pre-cracked borehole is 0.029 m~3/min.hm, compared to the unpre-drilled drill,the hole flow rate of the 100 m hole is 0.01 m~3/min.hm, which is increased by 3 times; the average extraction volume of the pre-cracked hole is 0.0613 m~3/min, and the extraction volume of the unpre-drilled hole is only 0.023 m~3/min. The amount of cracked borehole extraction was 2.66 times higher than that of the unpre-drilled borehole.
In order to improve the gas drainage efficiency of the Xiegou coal mine, the pre-splitting blasting of the original coal body was proposed by liquid CO_2 pre-cracking and anti-reflection technology. The results show that the reasonable spacing of the blastholes in the 18205 working face of the Xiegou Coal Mine is 7 m; after the drilling and blasting, the average gas flow rate of the pre-cracked borehole is 0.029 m~3/min.hm, compared to the unpre-drilled drill,the hole flow rate of the 100 m hole is 0.01 m~3/min.hm, which is increased by 3 times; the average extraction volume of the pre-cracked hole is 0.0613 m~3/min, and the extraction volume of the unpre-drilled hole is only 0.023 m~3/min. The amount of cracked borehole extraction was 2.66 times higher than that of the unpre-drilled borehole.
引文
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[2]毕建乙.马堡煤矿大直径顶板走向长钻孔瓦斯抽采技术研究[D].辽宁阜新:辽宁工程技术大学,2015.
[3]周西华,王鹏辉,门金龙,等.高瓦斯特厚煤层下分层千米钻孔瓦斯抽采技术[J].煤田地质与勘探,2016,44(4):20-24.
[4]何福胜,毕建乙,王海东.液态CO2相变致裂增透强化抽采技术研究[J].中国矿业,2018,27(S2):146-150.
[5]周西华,门金龙,宋东平,等.液态CO2爆破煤层增透最优钻孔参数研究[J].岩石力学与工程学报,2016,35(3):524-529.