Construction method capable of reducing roof cutting depth of gob-side entry retaining

Abstract

The invention discloses a construction method capable of reducing the roof cutting depth of gob-side entry retaining, and belongs to the field of mine support. The method mainly comprises the following steps: (1) digging a working face tunnel to form a Y-shaped ventilation system; (2) directionally presplitting a top plate in an auxiliary intake airway construction blasthole; (3) changing all or parts of a working surface bracket into a top coal caving long tail beam bracket, and during working surface recovery, throwing inbreak gangues to an intake airway side by the top coal caving long tail beam bracket through a belt conveyor, a breaker and a downward-spreading conveyer; (4) along a tunnel edge, adopting a monomer hydraulic prop and a reinforcing mesh protection tunnel to form a lane with directional blasting gangues in a goaf; (5) after a working surface goaf is stable after collapse, carrying out guniting to seal the goaf; (6) repeating steps (2) to (5), thus forming a continuous roadside support to realize the mining of a Y-shaped ventilation no-coal pillar. After the method is adopted, roof cutting hole depth can be reduced, and explosion and construction cost is reduced; goaf gangues are adopted for supporting so as to improve a tunnel maintenance effect, and gob-side entry retaining cost and labor intensity are lowered.

Description

technical field [0001] The invention relates to the technical field of roadside support for gob-side entry retention, in particular to a construction method suitable for reducing the depth of top cut in gob-side entry retention in underground medium-thick coal seams. Background technique [0002] Gobside entry retaining has a series of outstanding advantages and is widely concerned by engineers and technicians. Gobside entry retention is to build a roadside support body behind the working face, and retain the roadway as the next working face. Patent No. ZL201210003666.3 discloses a coal pillar-free mining method for longwall working faces. The roof is pre-cracked by constructing energy-gathering ring blastholes in front of the working face, and then under the action of mine pressure on the working face, The rear automatically forms a lane gang. With this method, the roadway can be retained without special construction of the filling body next to the roadway, and the cost is...

AI Technical Summary

Problems solved by technology

With this method, the roadway can be retained without special construction of the filling body next to the roadway, and the cost is low. However, as the mining height increases, the depth of the blast hole constructed by the energy-concentrating ring increases exponentially, and the blasting effect also increases with the increase of the blast hole. Decreases with increasing depth

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