Fully mechanized coal face high suction tunnel lower-returning drilling primary mining gas drainage method

Abstract

A gas drainage method for initial mining in a high-pumping working face under the back-drilling hole, the purpose of which is safe and convenient construction, improving the drainage rate, and effectively reducing the gas concentration of the working face; At a horizontal distance of 0 to 50 meters, excavate 2 to 3 drilling sites suitable for drilling rig construction, and drill 2 to 3 drilling holes in each drilling site; use drilling rigs to drill to the working face to replace the lower return of the back high pumping roadway Drilling, the drilling is drilled down from the high pumping roadway to the pressure relief zone just developed at the initial mining stage above the working face. ° within the angle line and within the rock stratum 4 to 5 times the mining height from the roof of the working face; during the initial mining of the working face, the high-level pumping roadway will be enclosed in the wall, and the iron pipe will be pressed to connect with the main pumping system to provide With high negative pressure, the gas that rises to the fracture zone is pumped to the high-level pumping lane through the down-return drilling, and then enters the drainage system to reach the ground.

Description

technical field [0001] The invention relates to a method for treating primary mining gas drainage in a fully mechanized caving face, in particular to a method for drilling primary gas drainage in a high drainage roadway in a fully mechanized caving face. Background technique [0002] At present, the gas drainage is the fissure zone when the drilling of the high pumping roadway is drilled and the working face falls. The fissure zone is generally located at a position 8 to 15 times the mining height from the roof. No gas can be pumped through the fissures, and if it is lowered, there will be borehole collapse or high-pumped alleyway roof collapse, and gas cannot be pumped. Within 20 meters of the initial mining, the gas in the gob can be diluted by the wind flow and enter the return airway because the roof does not fall, and the gas in the working face does not exceed the limit. Falling, falling is not complete, the fracture zone moves down and begins to develop upwards, so t...

AI Technical Summary

Problems solved by technology

But with this method, the construction is difficult, the cost is high, the ventilation management is difficult, the gas is easy to accumulate, and there are potential safety hazards

At present, there is still a lack of a safe, effective, and low-cost method for gas drainage in the primary mining of fully mechanized caving faces

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