Deep hole multistage loosening blasting fracturing method

A loose blasting and deep hole technology, which is applied in blasting, earthwork drilling, gas discharge, etc., can solve the problem of inability to carry out two or more consecutive blasting, achieve a wide range of pressure relief, and facilitate gas drainage and pressure relief reliable results

Active Publication Date: 2021-06-29
CHINA UNIV OF MINING & TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] At present, the deep hole loosening and pressure relief blasting is a single-stage blasting method. The explosives used are generally solid explosives. After the explosives are loaded once and exploded, two or more consecutive blastings cannot be carried out in the same hole.

Method used

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  • Deep hole multistage loosening blasting fracturing method
  • Deep hole multistage loosening blasting fracturing method

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Embodiment Construction

[0025] 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, not all, embodiments of the present invention. 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.

[0026] like Figure 1 to Figure 2 As shown, a deep hole multi-stage loose blasting fracturing method specifically includes the following steps:

[0027] S1, set up drilling 13 and observation hole 18 and assemble equipment; prepare two gas cylinders 1 for filling oxidant and reducing agent respectively, the outlet of gas cylinder 1 connects hose 6 through first flashback preventer 2, hose 6 Along the direction away from the gas cylinder 1, a flow meter 3, a f...

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Abstract

The invention discloses a deep hole multistage loosening blasting fracturing method. The method comprises the steps of drilling and observation hole forming, equipment assembling, airtightness detecting, reducing agent injecting and oxidizing into a drilled hole and ignition detonation. The method is applied to pressure relief and permeability increasing of a coal mine, multistage blasting can be achieved through the same drilled hole, a larger pressure relief range is formed, fractures are formed in a coal body through explosion impact, and therefore a seepage channel is provided for gas stored in the coal body, the gas permeability of the coal body is improved, and gas extraction is facilitated.

Description

technical field [0001] The invention relates to the field of deep hole blasting, in particular to a deep hole multi-stage loosening blasting method for cracking. Background technique [0002] At present, the deep hole loosening and pressure relief blasting is a single-stage blasting method. The explosives used are generally solid explosives. After the explosives are loaded once and exploded, two or more consecutive blastings cannot be carried out in the same hole. The explosive force of single-stage blasting cannot act on the coal body multiple times, and can only produce cracks / cracks once; while multi-stage blasting further develops cracks and cracks on the basis of the cracks / cracks produced by the previous blasting, so that around the single hole The cracks in the coal body are more abundant, expanding the pressure relief area of ​​a single hole until it penetrates with other surrounding holes, improving the effect of pressure relief and anti-reflection, and also conveni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/263F42D3/00
CPCE21F7/00E21B43/263F42D3/00
Inventor 林柏泉徐幼平李玉雪林明华
Owner CHINA UNIV OF MINING & TECH
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