Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam

Abstract

The invention discloses a method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on a soft and high-outburst coal seam, and in particular is applied to quick tunneling in a coal seam which is high in outburst danger and a laneway is difficult to support in a coal mine. The method comprises the following steps of: forming a network type fractured net by high-pressure jet flow seam cutting, pressure relief and permeability enhancement technologies, and enhancing an effect of extracting strip-type coal seam gas on a coal laneway subjected to through-going drilling and pre-extraction; and forming a network type filling region by pressing and injecting filling materials, so that the strength and stress distribution of a coal body are improved, the coal laneway is easy to maintain in the tunneling process, a phenomenon that the gas rushes out of a tunneled laneway is avoided, gas accidents are eliminated in the tunneling process, and an aim of safely and quickly tunneling the laneway is fulfilled.

Description

technical field [0001] The invention relates to a rapid excavation method, in particular to a rapid excavation method applicable to soft and high outburst coal seams with strong outburst risks and difficult support coal seams in coal mines. Background technique [0002] The mining of soft and high outburst coal seams is accompanied by a large amount of gas gushing out, and the outburst threat is greater, and the soft coal quality makes it difficult to support coal roadways, which seriously restricts the safe and rapid production of mines. At present, when the protective layer cannot be exploited, the gas problem in the process of excavating the high outburst coal seam is mainly solved by pre-extracting coal seam gas. However, the conventional gas drainage method has a small effective range of gas drainage in a single hole and a large drilling workload. Moreover, the low extraction efficiency cannot effectively solve the gas hazard during the excavation process. Due to the s...

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Problems solved by technology

[0002] The mining of soft and high outburst coal seams is accompanied by a large amount of gas gushing out, which poses a greater threat of outbursts, and the soft coal quality makes it difficult to support coal roadways, which seriously restricts the safe and rapid production of mines.

At present, when the protective layer cannot be exploited, the gas problem in the process of excavating the high outburst coal seam is mainly solved by pre-extracting coal seam gas. However, the conventional gas drainage method has a small effective range of gas drainage in a single hole and a large drilling workload. Moreover, the low extraction efficiency cannot effectively solve the gas hazard in the excavation process

Due to the soft coal quality and high pressure during the coal roadway excavation, roadway maintenance is very difficult, a lot of manpower and material resources are wasted, the progress of the project is affected, and the mining imbalance is caused.

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