High-gas three-soft high-instability coal seam fully mechanized caving face gob-side entry retaining method

Abstract

The invention belongs to the field of gob-side entry retaining methods, and relates to a high-gas three-soft high-instability coal seam fully mechanized caving face gob-side entry retaining method. The method comprises the steps that S1, reinforced support is performed on roadway soft top plates; S2, blasting pre-cracking is performed on a side roadway in goaf; S3, a pedestrian passage is constructed; S4, a diamond-shaped wire mesh is laid on the roof of a support at an entry retaining side close to a working face, and top coal is not placed; S5, a damper device and the wire mesh are laid on the goaf side behind a working face frame; S6, under the action of mine pressure, gangue pre-cracked in S2 vermiculite is accumulated to form a stone wall; S7, a single-unit hydraulic prop and an n-shaped beam are adopted in a dynamic pressure bearing area of the working face to reinforce supporting, so that dynamic pressure formed by caving of a top plate of the working face is resisted; S8, according to the air leakage condition of the working face, concrete is sprayed or not sprayed on the surfaces of the wire mesh and gangue wall; S9, with the advancement of the working face, the damper device, single-unit hydraulic prop and n-shaped beam in a roadway forming stable area are removed in sequence, and the above steps are circulated continuously until entry retaining is completed.

Description

technical field [0001] The invention belongs to a gob-side entry retaining method, in particular to a gob-side entry retaining method in a fully mechanized caving working face with high gas, three soft and extremely unstable coal seams. Background technique [0002] Gobside retaining can minimize the loss of coal pillars in the working face, completely solve the gas overrun in the upper corner, and ease the extraction and replacement of excavation. At present, this technology has been gradually popularized and applied in my country; The schemes mainly include concrete flexible form filling entry retention, high-water material filling entry entry retention, and gob-side pressure relief entry entry retention. Among them, the concrete filling entry entry retention mainly has prominent shortcomings such as large material consumption, complicated process, large investment in equipment systems, and large number of personnel. ; Filling entry retention with high-water materials has di...

AI Technical Summary

Problems solved by technology

However, the fully-mechanized caving face has not yet carried out automatic roadway formation by cutting roof along the goaf for pressure relief, and mining still adopts the 121 construction method (one working face, two roadways, and one coal pillar), which not only wastes coal resources, but also causes tension in mining.

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