Extraction method combining roof extraction roadway cross-layer drilling presplitting blasting with multi-branch directional holes

A technology of layer-penetrating drilling and pre-splitting blasting, which is applied in mining fluids, mining equipment, earthwork drilling and mining, etc. It can solve the problem of drainage effect, the drainage time can not achieve the ideal effect, low gas permeability and large attenuation coefficient And other issues

Active Publication Date: 2021-02-19
HENAN UNIVERSITY
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Problems solved by technology

However, practice has shown that although such conventional methods can also extract most of the gas in the coal seam, it takes 3-5 years or more. In order to completely eliminate the huge contradiction between the coal seam outburst danger and the coal mine connection, this kind of Although the measures have been used all the time, due to factors such as low gas permeability and large attenuation coefficient in the coal seam, the extraction effect and extraction time cannot achieve the desired effect. One of the main causes of accidents

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  • Extraction method combining roof extraction roadway cross-layer drilling presplitting blasting with multi-branch directional holes
  • Extraction method combining roof extraction roadway cross-layer drilling presplitting blasting with multi-branch directional holes
  • Extraction method combining roof extraction roadway cross-layer drilling presplitting blasting with multi-branch directional holes

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Embodiment Construction

[0023] The present invention will be further described in conjunction with the accompanying drawings.

[0024] As shown in the figure, a roof drainage roadway penetration drilling pre-splitting blasting extraction method includes a rock roadway constructed above the roof of the mining coal seam, a layer-penetrating drill hole in the rock roadway to the lower coal seam, and lowering of the coal mine in the drill hole The permissible explosives use the pre-splitting blasting method to loosen and relieve the pressure of the drilled holes, seal the drilled holes after blasting, and construct directional branch holes in the roadway.

[0025] The rock roadway above the mining coal seam, that is, at the planned working face position, before the coal roadway or other rock roadway is not constructed, in the rock formation above the coal seam between the air inlet roadway and the air return roadway planned and constructed on the working face , digging a rocky roadway.

[0026] The rock...

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Abstract

The invention discloses an extraction method combining roof extraction roadway cross-layer drilling presplitting blasting with multi-branch directional holes, belongs to the field of coal mine underground gas extraction. The extraction method aims to be applied in a high-gas mine or a coal and gas outburst mine which is soft in coal quality, large in coal seam gas endowment amount and poor in coalseam fluidity. The extraction method is a gas control method which is characterized in that gas extraction needs to be conducted on a coal seam before coal seam extraction, gas in the coal seam is extracted in advance and the outburst risk of the coal seam is eliminated.

Description

technical field [0001] The invention belongs to the technical field of underground gas drainage in coal mines, and in particular relates to a method for improving the drainage volume of soft and low-permeability coal seams and effectively reducing the drilling engineering quantity of the coal seam. method. Background technique [0002] Soft and low-permeability coal seam is one of the main characteristics of high gas and coal and gas outburst mines. Due to the soft and broken coal seam, the coal seam is strongly affected by the transformation of geological structure in the process of coal metamorphism and evolution, and the gas is bound inside the coal seam and It cannot be released to the upper rock formation, resulting in strong adsorption capacity of coal, but extremely weak migration and desorption capacity of gas in coal seam. This type of coal seam has many characteristics such as deep burial depth, weak resistance to deformation, strong plasticity, and poor air perme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/263E21B21/00
CPCE21F7/00E21B43/263E21B21/00
Inventor 王伟李宏
Owner HENAN UNIVERSITY
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