Segmented rapid hole sealing method for coal mine broken roof blasting drilling

A technology for roof breaking and hole sealing, which is used in earth-moving drilling, sealing/isolation, wellbore/well components, etc. Hidden danger, the effect of shortening the sealing time

Active Publication Date: 2021-01-22
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

This method of sealing the hole means that the blasting cannot be fired on duty, and the blasting lead drawn from the drilled hole must be placed in the hole for 24 hours, which not only wastes a lot of time, but also poses a safety hazard
The problem with using yellow mud to seal holes is that it is time-consuming and labor-intensive. It is necessary to prepare yellow mud in advance, and after screening and wetting, use special machinery to blow it into the hole. Pore ​​effect is difficult to guarantee

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  • Segmented rapid hole sealing method for coal mine broken roof blasting drilling
  • Segmented rapid hole sealing method for coal mine broken roof blasting drilling

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Embodiment Construction

[0025] 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.

[0026] A segmented rapid hole sealing method for blasting drilled holes with broken roofs in coal mines, comprising the following steps:

[0027] 1. The depth L of the broken top blasting borehole 1 with a hole diameter of 94mm is 54m, and the length L1 of the sealing area is calculated according to the depth L of the broken top blasting borehole 1 to be 18m, both of which satisf...

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Abstract

The invention relates to a blasting drilling hole sealing method, in particular to a segmented rapid hole sealing method for coal mine broken roof blasting drilling. The segmented rapid hole sealing method comprises the following steps that local chambering is carried out on a drilled hole, and a chambering section is blocked by adopting a filter accumulation type bag, so that a sugar-coated haw-shaped cement column is formed. Blasting pressure generated by explosive explosion is difficult to break through the sugar-coated haw-shaped cement column, water can flow out of the bag after cement mortar enters the filter accumulation type bag, and high-concentration quick-setting cement can be stored in the bag, so that simple, quick and safe hole sealing of coal mine broken roof blasting drilling is realized. By using the segmented rapid hole sealing method for coal mine broken roof blasting drilling, on-duty (within 6 hours) blasting can be achieved, and the potential safety hazard that ashot line is exposed can be eliminated.

Description

technical field [0001] The invention relates to a hole sealing method for blasting drilling, in particular to a segmented rapid hole sealing method for blasting drilling of broken roofs in coal mines. Background technique [0002] my country has entered deep coal mining, and rock burst accidents have occurred in most mining areas, such as Juye in Shandong, Binchang in Shaanxi, and Huating in Gansu. The accidents caused huge property losses. In order to prevent rock burst, it is a good technical measure to blast the hard roof above the coal seam to cut off the path of stress transmission above. In recent years, it has been widely used in Binchang, Huating, Yanzhou, Juye and other mining areas, and the effect is remarkable. [0003] Since the length of the blasting broken roof drill hole is generally greater than 30m, and can even reach 100m, according to the relevant national regulations, the hole sealing section should reach at least one-third of the hole depth. This means...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 马衍坤杨志良刘健傅菊根张曦谭辉邓子墨李尧斌
Owner ANHUI UNIV OF SCI & TECH
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