Method for weakening coal seam hard top plate

A technology for hard roof and coal seam, applied in the field of weakening treatment of hard and difficult-to-collapse roof of coal seam, can solve the problems of difficult natural collapse, large influence range, affecting the normal and safe production of the mining area, etc. Effect

Inactive Publication Date: 2017-11-24
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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Problems solved by technology

[0004] In order to solve the problem that in the actual mining process, the hard roof is overhanging in a large area and it is difficult to collapse natural

Method used

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  • Method for weakening coal seam hard top plate
  • Method for weakening coal seam hard top plate

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] A method for weakening the hard roof of a coal seam, the specific steps are as follows,

[0028] 1) Drilling settings:

[0029] The hydraulic fracturing drilling is arranged within 200m of the cutting hole, the drilling spacing is 100-200m, and the drilling arrangement is selected on the side closer to the return airway.

[0030] 2) Ground drilling:

[0031] (1) The first hole of drilling is drilled with a Ф311mm drill bit, drilled below...

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Abstract

The invention belongs to the technical field of weakening treatment of hard and difficult roofs of coal seams, in particular to a method for weakening hard roofs of coal seams. Solve the problem that in the actual mining process, the hard roof is overhanging in a large area and it is difficult to collapse naturally. After the collapse, it mostly collapses in a large area and has a large impact range. 1) Drilling settings, 2) Ground drilling, 3) Chemical erosion, 4) hydraulic fracturing, 5) surface drainage. The invention can not only give full play to the softening effect of the chemical solution on the hard roof rock, but also give full play to the effect of hydraulic fracturing on the cutting and cracking of the rock, thereby softening the hard roof rock.

Description

technical field [0001] The invention belongs to the technical field of weakening treatment of hard and difficult roofs of coal seams, in particular to a method for weakening hard roofs of coal seams. Background technique [0002] There are a large number of hard roof coal seams in my country. This type of roof occurs directly above the coal seam or directly on the thinner roof. It has high strength, large thickness, strong integrity, and no joints and fissures. When using the knife column mining method or longwall caving mining method, the hard roof can hang a large area in the goaf without caving, and the initial pressure and periodic pressure steps are large, and the The impact of dynamic pressure can easily damage the support. In severe cases, the suspended roof area of ​​the gob can reach thousands to tens of thousands of square meters. Timely treatment of the overhanging hard roof, reducing energy accumulation and reducing the drop height of the roof are the basic meth...

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Application Information

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IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 张永成李兵刘亮亮刘君徐云张江华张为秦玉霞李德慧王越白杨
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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