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Primary extraction working face high-level suction tunnel gas extraction method

A technology for gas drainage and working face, which is applied in gas discharge, mining equipment, earthwork drilling and mining, etc. It can solve problems such as gas accidents, difficulty in functioning, and lack of gas, so as to prevent gas from exceeding the limit and increase the amount of gas drainage Effect

Active Publication Date: 2014-10-01
COAL IND JINAN DESIGN & RES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for the initial mining face, the high pumping roadway is difficult to play a role. The reason is that the roof directly collapses to fill the goaf before the cycle is pressed. The old roof is still completely supported on the two coal walls, and the cracks and cracks have not yet Formed, the gas in the working face has no channel connected with the high pumping alley
[0004] In the mining face with a large amount of gas emission, if the problem of gas exceeding the limit cannot be effectively solved, the production of the working face will be seriously affected, and even more serious gas accidents will be caused

Method used

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  • Primary extraction working face high-level suction tunnel gas extraction method
  • Primary extraction working face high-level suction tunnel gas extraction method
  • Primary extraction working face high-level suction tunnel gas extraction method

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Embodiment Construction

[0023] This extraction method is realized through the following technical scheme:

[0024] (1) Determine the initial caving (pressure) step distance L: the value of L is related to factors such as basic roof lithology, thickness and geological structure, generally 10-30m, and a few up to 50-70m.

[0025] (2) Changing the 1st layer of the high extraction roadway: In order to make the high extraction roadway play a role in the initial recovery stage of the working face, the slope began to change when the construction high extraction roadway was 4 horizontal distances away from the cut hole and the remaining Lm. Adjust the level of the high pumping roadway from the original arrangement in the coal seam fissure zone 7 to be in the coal seam caving zone 6, that is, arrange the front section Lm of the high pumping roadway in the caving 6.

[0026] (3) Construction layer-penetrating drilling 5: set up a drilling site every 10m in the front Lm high pumping roadway, and construct 3 to ...

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Abstract

The invention relates to the technical field of high-level suction tunnel extraction and particularly discloses a primary extraction working face high-level suction tunnel gas extraction method. The primary extraction working face high-level suction tunnel gas extraction method is characterized in that a primary caving step is confirmed as L meters; a position of high-level suction is adjusted from a coal layer fissure zone to a coal layer caving zone; a cross-layer borehole which is constructed downwards penetrates a working face coal layer from the high-level suction tunnel downwards to reach to a bottom plate; and manual forced caving is adopted immediately after the working face mining, and meanwhile a top plate during the first weighting period is effectively controlled. The primary extraction working face high-level suction tunnel gas extraction method solves the problem that primary working face high-level suction tunnel is difficult to play its role, effectively prevents gas of the working face from exceeding a limit, lays a foundation for safe production of the working face, effectively improves high-level suction tunnel gas extraction amount, and makes contribution to integrated utilization of the gas of a mine.

Description

(1) Technical field [0001] The invention relates to the technical field of high drainage roadway drainage, in particular to a gas drainage method for high drainage roadway in primary mining working face. (2) Background technology [0002] High extraction roadway drainage technology: Arrange high drainage roadways in the fracture zone where the roof of the working face is damaged. After the roof collapses, the gas balance in the adjacent layers and surrounding rocks will be destroyed, and the gas desorbed from the adjacent layers and surrounding rocks will flow to the mining area along the cracks. The empty area flows, and the gas is pumped out through the high pumping lane. Practice has proved that the gas emission is 35m 3 / min above the mining surface, the most effective treatment method is to use high-level drainage roadway for extraction. High drainage roadway drainage has the characteristics of small section, simple support, fast construction progress, no maintena...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 张强孙卫华谭国龙延伟涛张其东
Owner COAL IND JINAN DESIGN & RES
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