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Gel coupling blasting method for roof cutting of fractured roof area of coal mine

A fissure and gel technology, used in blasting, ground mining, earth-moving drilling, etc., can solve problems such as energy dissipation, achieve high-efficiency transfer, reduce heat loss, and reduce compressibility.

Pending Publication Date: 2021-07-30
INST OF ENERGY HEFEI COMPREHENSIVE NAT SCI CENT (ANHUI ENERGY LAB) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, during blasting and roof cutting, if the roof contains a large number of cracks, a large amount of energy will be dissipated in the crack area when air coupling is used; when water coupling is used, water will flow away along the cracks

Method used

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  • Gel coupling blasting method for roof cutting of fractured roof area of coal mine
  • Gel coupling blasting method for roof cutting of fractured roof area of coal mine
  • Gel coupling blasting method for roof cutting of fractured roof area of coal mine

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Embodiment Construction

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0032] see Figure 1 to Figure 3 As shown, a gel-coupled blasting method for roof cutting in a coal mine with cracked roof area, the steps are as follows:

[0033] 1. Investigate the specific situation of the roof 1 in the area where the roof is to be cut in a certain coal seam. The strength of the roof is 58-75MPa, but there are many joints and cracks in the old roof. Starting ...

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Abstract

The invention discloses a gel coupling blasting method for roof cutting of a fractured roof area of a coal mine. The gel coupling blasting method comprises the following steps that a plurality of blasting drill holes are drilled in a to-be-blasted roof cutting area spanning two or more rock strata, blasting explosive is put into the blasting drill holes, the blasting drill holes are sealed by using a hole sealing material, and then a gel mixture with a fixed proportion is injected between the explosive and the hole walls of the drill holes through a gel pump. The specific non-flowing and semi-solid properties of gel are utilized, so that the problem of loss of a water medium at an interface between rock stratums when a water medium is adopted for coupling blasting in the past is solved; and the coupling between the explosive and the hole walls is fundamentally guaranteed, useless energy loss is reduced, and then the good blasting roof cutting effect is guaranteed. According to the gel coupling blasting method, the technology is simple, construction is convenient, safety and reliability are achieved, and efficiency is extremely high.

Description

technical field [0001] The invention relates to a blasting method for coal mine roof cutting and self-forming roadway, which belongs to the technical field of underground mining in coal mines, and in particular to a gel-coupled blasting method for roof cutting in a cracked roof area of ​​a coal mine. Background technique [0002] In the process of coal mining, especially when the roof is multi-layered and thick, with the continuous advancement of the working face, the cantilever beam with the coal pillar as the support point hangs and does not collapse, and the gangue falling from the roof is difficult to fill the goaf At this time, the concentrated stress borne by the coal pillar gradually increases, resulting in roof subsidence and bottom heaving in the roadway of the mining face, and even in severe cases, rock burst disasters may be induced. [0003] In order to cut off the stress transmission between the roofs and eliminate the threat of high stress environment to the ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D3/04E21C41/18
CPCF42D1/00F42D3/04E21C41/18
Inventor 马衍坤谭辉邓子墨杨志良闫梦
Owner INST OF ENERGY HEFEI COMPREHENSIVE NAT SCI CENT (ANHUI ENERGY LAB)