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A gas control method for working face of rock protective layer under close hard roof

A hard roof and working face technology, applied in the direction of gas discharge, earthwork drilling, safety devices, etc., can solve the problems of mining conditions without protective layers, low efficiency, long extraction time, etc.

Active Publication Date: 2018-05-01
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coal seam of Pingdingshan Coal Group Group does not have the conditions for mining the protective layer, and has been using rock roadway drilling for drainage. Due to the low gas permeability of the coal seam, the extraction time is long and the efficiency is not high

Method used

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  • A gas control method for working face of rock protective layer under close hard roof

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Embodiment Construction

[0013] Such as figure 1 As shown, a gas control method for the working face of the rock protective layer under the close-distance hard roof is to use the soft mudstone in the suitable layer of the protruding coal seam floor as the protective layer under the condition of no protective layer mining, and the mudstone working face adopts Y-shaped downward ventilation The gas and gas in the protected layer are extracted by means of coal roadway in the protected layer, drilling along the bedding, downward drilling, upward drilling in the roadway of the mudstone working face, lagging drilling, and buried pipes in the goaf. Gob gas.

[0014] The mudstone working face adopts the gob-side retaining method, and the filling wall is built at the position of the lower air entry roadway, and the Y-shaped ventilation is constructed. Considering that the mudstone roof is a hard rock formation, after the filling wall construction is completed, the blasting method is used to cut the mudstone roo...

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Abstract

The invention discloses a gas treatment method of a rock protection layer working face under a near-distance hard roof. When protective seam mining conditions do not exist, weak mudstone of a proper position of an outburst coal seam bottom plate serves as a protective layer, Y-type downward ventilation is adopted on the mudstone working face, and gas of a protected layer and a goaf area is extracted by means of protected layer coal roadways, bedding drilled holes, downward seam penetrating drilled holes, upward seam penetrating drilled holes and hysteretic drilled holes of a mudstone working face roadway, goaf area pipe laying and other modes. The bedding drilled holes and the seam penetrating drilled holes below the bedding drilled holes and adjacent to an outburst coal seam are formed in the pre-constructed coal roadways, and gas of a pressure release seam in an upper section area of the protected area of the mudstone working face is extracted. Pressure release gas of a lower section area corresponding to the protected seam is extracted by means of the hysteretic drilled holes of the mudstone working face, and two hysteretic seam penetrating holes facing the working face are formed in every construction place. Pipes are laid along the top of an abandoned roadway filling wall to extract and control gas in the goaf area. The protected layer coal roadways seal the roadway section by section to extract gas.

Description

technical field [0001] The invention relates to the technical field of mine gas prevention and control, and is suitable for the technical method of gas drainage in the mining of protective layers. Background technique [0002] Gas drainage is the main content of gas control in the process of mining high-gas coal seams and outburst coal seams, and is the core of preventing coal mine gas accidents. At present, coal seam gas extraction mainly adopts two methods: drilling method and roadway method. For the gas control in the mining of outburst coal seams, generally a rock roadway is excavated first, pre-extraction is performed by drilling through layers, and then the coal roadway is excavated in the outburst-reducing coal seam, and pre-extraction is performed by drilling along the bedding. Or use bedding drilling pre-pumping in the coal seam where the outburst is eliminated, and then construct the coal seam roadway in the area covered by the bedding drilling after the outburst ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00
CPCE21F7/00
Inventor 秦汝祥张晋京杨应迪潘竟俊李广涛邱进伟唐明云
Owner ANHUI UNIV OF SCI & TECH
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