Fully mechanized caving face gob-side entry retaining process and ventilating method

Abstract

The invention relates to a fully mechanized caving face gob-side entry retaining process and a ventilating method, and belongs to the technical field of mine supports and ventilating security. The process is applied to a high-gas thick-seam large-section roadway with poor conditions; an air inlet way, an air return way, a remained gob-side entry and a gas discharge way form an Y-I ventilating mode, and a problem of gas concentration exceeding limitation caused by corner methane accumulation on a coal mining working face is solved; the air return way behind a fully mechanized caving face is retained to serve as the gob-side entry, and gob-side entry retaining operation is performed, so that the mining without coal pillars is achieved, and the mining coefficient is ensured; a pier column serves as side way support, so that the side way supporting strength is improved; gangue is used for establishing an additional gangue wall on the outer side of the pier column of the side way support, so that the pressure on the pier column can be obviously reduced, and the impact of the roof fallen gangue in a gob on the pier column is avoided; and a layer of concrete is coated on a reinforcing steel bar net, so that air leakage of the gob is effectively avoided. The gob-side entry retaining process and the ventilating method are easy to implement and promote, and has excellent economic values.

Description

technical field [0001] The invention belongs to the technical field of mine support and ventilation safety, and in particular relates to a gobside entry retaining process and a ventilation method for fully mechanized caving working faces, which are suitable for fully mechanized caving working faces with high gas and thick coal seams. Background technique [0002] At present, when mining high-gas thick coal seams in fully mechanized caving faces, the coal mining technology used is the comprehensive mechanized top-coal caving mining method. This coal mining technology has the advantages of high per unit yield, high equipment utilization rate, and low cost. However, the traditional U-shaped ventilation method has obvious shortcomings. The gas in the upper corner of the coal mining face is easy to accumulate and cause the gas to exceed the limit, which brings great safety hazards to mine production. [0003] In order to solve the disadvantages caused by the U-shaped ventilation ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the present invention provides a gob-side entry retaining process and ventilation method for fully mechanized caving working faces, which is suitable for large-section roadways with high gas and thick coal seams, and has high support strength for gob-side entry entry , which can effectively prevent air leakage in the goaf and solve the gas overrun problem caused by gas accumulation in the upper corner of the coal mining face

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