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Combined gob-side entry retaining method of wedge-shaped regenerated wall and single-leg shed beam in coal mining roadway

A technology for empty entry and roadway, which is used in tunnels, ground mining, mining equipment and other directions to achieve the effect of improving the utilization rate

Active Publication Date: 2020-01-03
四川达竹煤电(集团)有限责任公司金刚煤矿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Retraction block dense pillar
Reinforcement of the filling by spraying concrete into the filling

Method used

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  • Combined gob-side entry retaining method of wedge-shaped regenerated wall and single-leg shed beam in coal mining roadway
  • Combined gob-side entry retaining method of wedge-shaped regenerated wall and single-leg shed beam in coal mining roadway
  • Combined gob-side entry retaining method of wedge-shaped regenerated wall and single-leg shed beam in coal mining roadway

Examples

Experimental program
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example 1

[0044] The mechanically transported roadway tested by the present invention will be used as the return air roadway of the coal mining face in the lower section after the roadway is successfully retained. Namely the roadway 13 described in the present invention.

[0045] The basic conditions of its coal mining face 3 and roadway 13 are as follows.

[0046] This coal mining face machine roadway (roadway described in the present invention) is gob-side retaining roadway, does not establish roadway retaining coal pillar, is mining without coal pillar. The coal seam has a monocline structural strike of 315°, the maximum dip angle of the coal seam is 34°, the minimum is 27°, and the average is 31°. The maximum thickness of the coal seam is 2.9m, the minimum is 1.63m, the average thickness is 2.3m, the average mining height is 2.7m, the average thickness of the direct roof is 1.96m, and the bulk density (t / m 3 )1.35, the average inclination length of the coal mining face is 130m, an...

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Abstract

The invention discloses a composite gob-side entry retaining method using mining roadway wedge-shaped regeneration wall and single-leg shed beam. The method is characterized in that after the coal bedis cut off in the mining process, an advance notch is communicated with a mining working face to form a wedge-shaped notch, a concrete masonry wall is built at the lower section of the wedge-shaped notch, the collapsing gangue in a gob is naturally and downwards stacked to fill the wedge-shaped notch to form a filling body, and the concrete is sprayed to the filling body in the wedge-shaped notch, so as to complete the gob-side entry retaining. The method has the advantages that by fully utilizing the characteristic of the gangue naturally sliding down after a top plate of the inclined miningworking face collapses, support rods are densely installed to block the gangue in the early stage, then the gangue naturally falls down, and the concrete is sprayed to strengthen the gangue filling body, so that the structure of the gangue filling body is enhanced, and the strength of the filling body is improved; by adopting the wedge-shaped notch, the gangue automatically slides down to extrudeinto the wedge-shaped notch, and then the gangue is densely filled into the wedge-shaped notch to form the filling body.

Description

technical field [0001] The invention relates to an underground coal mining technology, in particular to a method for retaining roadways along gobs. Background technique [0002] Gobside entry retention technology is an advanced and green coal mining technology. Its outstanding advantages are: [0003] 1. First of all, it is a major breakthrough and technological revolution in mine excavation planning and mining area development and mining layout. It makes the mining roadway change from double or multi-lane to single-lane layout, which not only saves at least one mining roadway, but also enables continuous mining. The significance of sequential mining lies in: ① Alleviating the tension of continuity. It has been proved by practice that retaining entry along the gob can reduce the excavation volume of mining roadway by 20% to 80%. The mining-based Dazhu mining area is of great significance. ②The isolated island mining is avoided, and the gob-side retaining makes it no longe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21F15/00E21D20/00E21D11/14
CPCE21C41/18E21D11/14E21D20/00E21F15/00
Inventor 王长林谢金洪沈超张伟林彭刚薛波
Owner 四川达竹煤电(集团)有限责任公司金刚煤矿
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