Segment pre-blasting technology for steeply dipping hard coal seam roof

A technology with a hard roof and a large inclination angle, which is applied in blasting, roof beams supporting mine roofs, mining equipment, etc., can solve problems such as uneven damage, reduce caving steps, ensure relative stability, and lower supports Effects of loads and dynamic load factors

Inactive Publication Date: 2010-11-03
BAOSTEEL GROUP XINJIANG BAYI IRON & STEEL
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide an advanced pre-blasting process for the hard roof of a large-inclination coal seam, which can solve the problem of uneven damage to the roof of the working face of a large-inclination coal seam along the inclination direction

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  • Segment pre-blasting technology for steeply dipping hard coal seam roof
  • Segment pre-blasting technology for steeply dipping hard coal seam roof
  • Segment pre-blasting technology for steeply dipping hard coal seam roof

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Embodiment Construction

[0020] An advanced pre-blasting technology for a hard roof of a large-inclination coal seam, such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 As shown, there are non-equal-length blastholes at different angles arranged in the roof rock layer in the front of the working face in the return air and transport lane troughs 9 and 8 inwards to the front of the working face in the circulation top area 10, and the length of the blastholes in the return air trough is short, The included angle with the coal seam is large, the length of the blast hole along the transportation channel is long, and the included angle with the coal seam is small. The internal blasting of the hole destroys the rock under the action of the blast shock wave and the stress wave. The layout of the blast hole is based on the position, total thickness, dip angle and occurrence factors of natural cracks of the old top rock layer, the thickness of the coal seam, and the inclination length of the wor...

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Abstract

The invention discloses a segment pre-blasting technology for a steeply dipping hard coal seam roof. Blast holes with different angles and length are distributed in gate roads of air return and transportation roadways in front of a working surface towards a roof rock in front of the working surface; and the blast holes are charged in an uneven way with large charge mass, which has controlled fracturing action on the hard roof.

Description

Technical field [0001] The invention belongs to the technical field of blasting, and in particular relates to the blasting technology used in rock and soil, geology, mines and the like. Background technique [0002] Hard roof pre-blasting refers to a certain distance ahead of the working face, pre-drilling and charging blasting, using the effect of explosive energy inside the rock mass to change the physical and mechanical properties (quality) of the rock, reducing its strength and reducing the thickness of the layers. The natural overhang area is reduced, so as to achieve the purpose of controlling the large-area overhang of the hard roof and the resulting catastrophic collapse. Hard roof advanced pre-blasting technology has been widely used in gently inclined coal seams. However, to realize safe mining under the condition of hard roof in large-inclined coal seams and solve the problem of disasters caused by large-scale caving of hard roofs, it is necessary to focus on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/00E21D17/00
Inventor 黄国春伍永平李如明廖由俊李明周登辉宋建江吕文胜史全忠段长寿
Owner BAOSTEEL GROUP XINJIANG BAYI IRON & STEEL
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