Construction method for treating abnormal gas emission of goaf of low-gas mine through high-position drainage

Abstract

The invention discloses a construction method for treating abnormal gas emission of a goaf of a low-gas mine through high-position drainage. The method comprises the following steps of determining the height of a caving zone of a working face coal seam roof, determining the positions of high-position drainage end holes, determining the trend gradient of an upper crossheading, designing a drill hole, and sequentially arranging the end holes away from the working face roof from bottom to top, wherein the projection positions of the end holes are linearly arranged away from the working face, the holes are formed in a roadway roof stoping shoulder pit, the holes are sealed through double liquid slurry, a gate valve is installed at each hole opening, a gas sample observation hole is formed in the inner side of each valve, and a ground gas drainage pump is adopted in the mine. The method has the beneficial effects that the abnormal gas emission of the goaf caused by caving of the hard roof is reduced, generation of drilling friction flames of the goaf is effectively eradicated, and the method has the advantages of being high in construction safety, small in drainage work amount, and good in effect of treating the abnormal gas emission of the goaf of the low-gas mine and solves the problem of gas accumulation on the coal face caused by an upward ventilation mode in the case of caving of the coal face hard roof.

Description

technical field [0001] The invention relates to the technical field of mines, in particular to a construction method for high-level drainage to control abnormal gas gushing out of goafs in low-gas mines. Background technique [0002] In my country, most of the coal mining methods in underground coal mines are wall-type coal mining faces, and the roof is managed by the whole caving method. Effective caving, the upward ventilation method is often used in the wall-type coal mining face. The upward ventilation method on the coal mining face plays a significant role in the underground production of coal mines. From the perspective of production, it has the advantages of simple production system, high yield, high efficiency, and easy operation. From the perspective of the safety of the ventilation system, it has the unique advantages of stable air flow and less air leakage. Therefore, the arrangement of the upward ventilation method on the coal mining face is the main arrangement me...

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Problems solved by technology

[0002] In my country, most of the coal mining methods in underground coal mines are wall-type coal mining faces, and the roof is managed by the whole caving method. Effective caving, the upward ventilation method is often used in the wall-type coal mining face. The upward ventilation method on the coal mining face plays a significant role in the underground production of coal mines. From the perspective of production, it has the advantages of simple production system, high yield, high efficiency, and easy operation. From the perspective of the safety of the ventilation system, it has the unique advantages of stable air flow and less air leakage. Therefore, the arrangement of the upward ventilation method on the coal mining face is the main arrangement method in the underground of the coal mine; The biggest disadvantage of the working face is that poor management of the roof can easily lead to gas accumulation at the corners of the working face (that is, gas accumulation at the tail of the scraper conveyor)

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