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

A technology of retaining an empty entry and depth, which is applied in earthwork drilling, discharge machinery, ground mining, etc. It can solve the problems of weakening blasting effect and achieve the effect of improving maintenance effect, reducing construction cost and facilitating construction

Active Publication Date: 2017-11-24
CHINA UNIV OF MINING & TECH
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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 t

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

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Embodiment Construction

[0028] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0029] The method for reducing the depth of roof cutting in gob-side entry retention in medium-thick coal seams of the present invention comprises the following steps:

[0030] a. Excavate the main air inlet lane 1, the auxiliary air inlet lane 2, the cut hole 16 and the air return lane 14 of the working face to form a working face recovery system;

[0031] b. Auxiliary air inlet lane 2 in front of the working face is adjacent to the top-cutting blast hole in the roof construction of the mining side. Directional energy-gathering ring blasting is adopted. The depth of the blast hole 3 is determined according to the equivalent mining height and the gob gangue compaction rate. Orientate the pre-splitting roof along the direction of the auxiliary air inlet 2, and adopt the existing longwall working face mining method without coal pillars; the diameter of the bl...

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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...

Claims

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Application Information

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IPC IPC(8): E21C41/18E21C37/00
CPCE21C37/00E21C41/18
Inventor 陈勇柏建彪王襄禹张自政陈进王冬
Owner CHINA UNIV OF MINING & TECH
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