Method of loose blasting by high-pressure water jet helical cutting

A high-pressure water jet and loose blasting technology, which is applied in blasting, metal processing, etc., can solve the problems of increasing workload and cost, blocking gas migration channels, etc., to prevent occurrence and development, enhance coal gas permeability, prevent coal Prominent effect with gas

Active Publication Date: 2014-04-02
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the blasting, although the coal body around the blast hole is broken and part of the ground stress is relieved, the coal body far away from the blast hole is compacted because there is no compensation space for blasting cracks and fragmentation, thus blocking the gas migration channel, and in the distance A new stress concentration is formed. Since the working face is the free surface of the blasting, the coal body tends to move towards the working face during the explosion, or the coal body in the sealing section produces a cut-opening at the working face.
In view of the above shortcomings, t...

Method used

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  • Method of loose blasting by high-pressure water jet helical cutting
  • Method of loose blasting by high-pressure water jet helical cutting
  • Method of loose blasting by high-pressure water jet helical cutting

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Embodiment 1

[0023] Below in conjunction with accompanying drawing, the present invention is further described: as figure 1 , figure 2 , image 3 As shown, a high-pressure water jet spiral cutting groove loosening blasting method is characterized in that: comprising the following steps: comprising the following steps:

[0024] (1) Drilling: Use a drilling rig to drill a hole at the selected position of the coal and rock mass, with a diameter of 113 mm, and construct to the exact position according to the design plan;

[0025] (2) High-pressure water jet grooving: Spiral grooving is performed on the borehole at a position 0.5m outward from the starting end of the coal seam, and ends at a position 0.5m outward from the end end of the coal seam, so that a spiral jet slot is formed on the wall of the hole , the groove depth is 2-4cm;

[0026] (3) Charging: put the explosive with the detonator into the PVC pipe and then send the PVC pipe into the drill hole, using uncoupled charging and pos...

Embodiment 2

[0035] A high-pressure water jet spiral cutting groove loosening blasting method is characterized in that: comprising the following steps: comprising the following steps:

[0036] (1) Drilling: Use a drilling rig to drill a hole at the selected position of the coal and rock mass, with a diameter of 94mm, and construct it to the exact position according to the design plan;

[0037] (2) High-pressure water jet grooving: Spiral grooving is performed on the borehole at a position 0.5m outward from the starting end of the coal seam, and ends at a position 0.5m outward from the end end of the coal seam, so that a spiral jet slot is formed on the wall of the hole , the groove depth is 1-4cm;

[0038] (3) Charging: put the explosive with the detonator into the PVC pipe and then send the PVC pipe into the drill hole, using uncoupled charging and positive detonation;

[0039] ⑷Sealing the hole: send the PVC pipe filled with yellow sand into the drill hole and seal the hole with yellow ...

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Abstract

The invention provides a method of loose blasting by high-pressure water jet helical cutting. The method includes the steps: 1, drilling; 2, performing high-pressure water jet helical cutting; 3, charging; 4, sealing holes; 5, blasting. The method has the advantages that a crack zone formed by the method compared to traditional loose blasting is wider, coal seam permeability is greatly improved, control holes are fewer, and the cost is reduced; through the application of the water jet helical cutting manner, the defects of traditional mechanical cutting, such as tool jamming and drill locking, are overcome; the size of jet seams is determined by jet parameters, so that the problem that the size of the seams affects blasting effect is solved; helical cutting can be performed in axial and radial directions alternatively, through the application of the helical cutting manner, the range of crack zone is greatly enlarged and compensating space is provided for blasting, cut density can be adjusted, blasting lumpiness is controlled, and energy availability is improved; accordingly, economic benefit is increased on the premise of effectively preventing coal and gas outburst.

Description

technical field [0001] The invention relates to the technical field of loose blasting, in particular to a high-pressure water jet spiral groove loosening blasting method. Background technique [0002] At present, the deep hole loosening blasting technology is one of the technical means to prevent coal and gas outburst during the coal roadway excavation process. This technology is to force the coal seam to produce cracks to release stress and gas by loosening the coal seam by blasting, so as to improve the air permeability and gas permeability of the coal seam. The purpose of prevention and control salient. After the blasting, although the coal body around the blast hole is broken and part of the ground stress is relieved, the coal body far away from the blast hole is compacted because there is no compensation space for blasting cracks and fragmentation, thus blocking the gas migration channel, and in the distance A new stress concentration is formed. Since the working face ...

Claims

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Application Information

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IPC IPC(8): F42D1/00B26F3/00
Inventor 康勇郑丹丹粟登峰王晓川颜秉源李东洋
Owner WUHAN UNIV
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