Surface type extraction method based on gob-side entry retaining gas treatment

Abstract

The invention provides a surface type extraction method based on gob-side entry retaining gas treatment. The surface type extraction method mainly includes the steps that before a gob-side entry retaining artificial closed wall is constructed, gas extraction pipes are reserved on a top plate and a bottom plate of the closed wall at intervals, wherein the length of the extraction pipes is determined according to the length of an air leakage belt of a mine working face; gas is extracted, wherein the gas extraction pipes are communicated with a main extraction pipeline, a gas extraction pump is started for extraction. The method can effectively solve the return airway transfinite gas problem caused by gas released by residual coal, and the extraction effect is good. Construction is easy, andoperation construction can be carried out on the premise that normal ventilation of a return airway is not affected. Extraction holes in the gas extraction pipes are formed in the same side and are quick to drill. The extraction holes in the upper side and in the lower side are oppositely formed, that is, the extraction holes are formed face to face, and an extraction wall for surface type extraction is formed so that goaf gas carried by leaked air of the working face can be effectively intercepted, and the ventilation burden of the return airway is greatly relieved.

Description

technical field [0001] The invention belongs to the technical field of gas drainage, and in particular relates to a surface drainage method based on gas control in gob-side entry retention. Background technique [0002] With the deepening of the concept of green and high-efficiency mining in coal mines, small coal pillar mining is the future development trend of coal mines. Among them, the gob-side entry technology refers to the use of the working face to retain the roadway of the working face to serve the next working face, not only It can save the cost of a roadway excavation, and can also save the resource of a coal pillar. The working face adopting gob-side retaining technology generally adopts Y-shaped ventilation method. Although this method can avoid the problem of gas exceeding the limit in the upper corner, the return air flow will pass through the entire goaf, and it will be exhausted in the case of negative pressure ventilation. The gas released from coal residue...

AI Technical Summary

Problems solved by technology

The working face adopting gob-side retaining technology generally adopts Y-shaped ventilation method. Although this method can avoid the problem of gas exceeding the limit in the upper corner, the return air flow will pass through the entire goaf, and it will be exhausted in the case of negative pressure ventilation. The gas released from coal residues in the goaf is diverted to the return airway, such as figure 1 As shown, as the working face advances, the drainage gas in the return airway will gradually increase, which will inevitably cause the gas to exceed the limit as time goes by. The main treatment methods for this situation are artificial closed wall intubation or construction drilling at fixed points. Drainage, but this method can only solve the gas problem within the influence radius of the drainage, and the balance of the drainage is poor. To solve the gas problem of the entire roadway, intensive intubation or construction drilling is required. This method will not only increase the airtight burden of artificial airtight walls, increase construction costs, but also increase the difficulty of roadway management

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