High gas coal mining working face gas improving method withtunnel replaced with well

Abstract

The invention discloses a high gas coal mining working face gas improving method with a tunnel replaced with a well. The high gas coal mining working face gas improving method adopts the following steps that Step1, space positions of a mining area ground well vertical well, a mining area L-shaped ground well and a high position drilling hole are optimized and arranged; Step 2, instant gas extraction quantity of the mining area ground well vertical well, the mining area L-shaped ground well and the high position drilling hole is calculated correspondingly, and gas quantity q that can be desorbed instantly after extracting; Step 3, gas quantity q' instantly pouring out from the coal mining working face is calculated; and Step 4, whether a measure replacing the tunnel with the well achieves the purpose that improves coal mining working face gas over limits and remedying measure and improves the high gas coal mining working face gas with the well replacing the tunnel or not are assessed. According to the high gas coal mining working face gas improving method with the tunnel replaced with the well, the over limit problems of the coal mining working face, an upper corner and an air return tunnel can be solved, extracting with the measurewith the tunnel replaced with the well achieves the requirement of coal mining working face improving, and meanwhile, the construction cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of coal mine gas control, in particular to a method for controlling gas in a high-gas coal mining face by substituting a well for a roadway. Background technique [0002] Due to the high-intensity coal mining conditions in high-gas mines, the coal mining face and adjacent coal (rock) layers will release a large amount of gas due to the pressure relief effect of coal mining, making the coal mining face and the upper corner prone to gas If the concentration exceeds the limit, the sparks or heat sources that may be generated by coal mining machinery may cause gas explosions, which seriously affects the safety of coal mining face production. Moreover, there are potential safety hazards in the goaf after coal desorption and gas accumulation after coal mining. Contents of the invention [0003] In view of this, the object of the present invention is to provide a method for controlling gas in high-gas coal minin...

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Problems solved by technology

[0002] Due to the high-intensity coal mining conditions in high-gas mines, the coal mining face and adjacent coal (rock) layers will release a large amount of gas due to the pressure relief effect of coal mining, making the coal mining face and the upper corner prone to gas When the concentration exceeds the limit, the sparks or heat sources that may be generated by coal mining machinery may cause gas explosion, which seriously affects the safe production of coal mining face

In addition, there are potential safety hazards in goafs where residual coal desorption gas accumulates after coal mining

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