A method for retaining entry along the gob in fully mechanized caving face in high-gas three-soft and extremely unstable coal seam

Abstract

The invention discloses a method for retaining a gateway along a goaf in a fully mechanized caving face of a high gas three-soft unstable coal seam. The method comprises the following steps: 1, usinga constant resistance anchor cable to reinforce and support an original shed supporting soft roof; 2, constructing, cutting a top hole, and implementing presplitting blasting on a top plate of a sidegateway of the goaf 50 meters ahead of a working face; 3, constructing a pedestrian access on the gateway retaining side of the original shed supporting soft roof; 4, supporting a top cover near the gateway retaining side of the working face and laying a wire gauze; 5, laying the wire gauze in the goaf behind a working face frame; 6, enabling a presplit gangue to automatically fall and stack underthe action of the mine pressure until reaching a hard top plate rock at the upper end and forming a gangue wall; 7, using single props to reinforce and support in a dynamic pressure bearing area of the working face; 8, spraying a concrete or not spraying the concrete on the surface of the wire gauze and the gangue wall according to the condition of air leakage of the working face; 9, sequentiallydismounting the single props in a gateway forming stable area, and continuing to circulating the above steps until the whole operation of retaining the gateway along the goaf is finished. The supporting mode is simple, the cost is relatively low, and the gateway is efficiently retained.

Description

technical field [0001] The invention belongs to the technical field of roadway support, and in particular relates to a method for retaining roadways along the goaf in fully mechanized caving working faces of high-gas three-soft and extremely unstable coal seams. Background technique [0002] Gobside entry retaining can minimize the loss of coal pillars in the working face, completely solve the gas overrun in the upper corner, and ease the replacement of mining pumping. At present, this technology is gradually being promoted and applied in my country. [0003] The currently formed gob-side entry retention schemes mainly include concrete flexible form filling entry retention, high-water material filling entry entry retention, and gob-side entry entry retention for pressure relief. Among them, the concrete filling entry entry retention mainly has large material consumption, complicated process, and equipment system investment. There are outstanding disadvantages such as large s...

AI Technical Summary

Problems solved by technology

[0003] The currently formed gob-side entry retention schemes mainly include concrete flexible form filling entry retention, high-water material filling entry entry retention, and gob-side entry entry retention for pressure relief. Among them, the concrete filling entry entry retention mainly has large material consumption, complicated process, and equipment system investment. Large size, large number of people and other outstanding disadvantages; high-water material filling entry retaining has disadvantages such as low wall strength, high material cost, and easy weathering

At present, the 121 construction method (one working face, two roadways, and one coal pillar) is mostly adopted in the mining of fully mechanized caving faces at home and abroad, which not only wastes coal resources, but also causes tension in the mining process.

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