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Roof-cutting pressure relief method in hard-roof deep-hole pre-splitting blasting

A technology of pre-split blasting and roof cutting pressure relief, which is applied in the field of blasting and pressure relief, can solve the problems of strong mine pressure and coal pillar stress concentration in gob-side roadways, so as to improve coal pillar stability and reduce roadway deformation and damage. , The effect of reducing the number of roadway renovations

Inactive Publication Date: 2013-09-04
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a roof cutting and pressure relief method for deep hole pre-splitting blasting on a hard roof, which solves the problems of coal pillar stress concentration and It has obvious effect and wide practicability for problems such as strong mine pressure in gob-side roadway

Method used

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  • Roof-cutting pressure relief method in hard-roof deep-hole pre-splitting blasting
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  • Roof-cutting pressure relief method in hard-roof deep-hole pre-splitting blasting

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Embodiment 1

[0029] like Figure 1 ~ Figure 3 Shown, the present embodiment coal seam thickness M is 10m, specifically comprises the following steps:

[0030] Step 1: Arranging the top-cut roadway 2

[0031] The coal seam 7 is an extra-thick coal seam 7, so before the mining of the working face 6, the top-cut roadway 2 is excavated along the roof of the coal seam 7 in the coal pillar 3, and the horizontal stagger distance S between the top-cut roadway and the recovery roadway is 7m ;

[0032] Step 2: Arranging blast holes 4 and control holes 5

[0033] Inclined blastholes 4 and control holes 5 are vertically arranged in the roof rock layer 8 above the entire roof cutting roadway 2, and the control holes 5 are arranged in the middle position between adjacent blastholes 4; The distance between the side of the roadway 2 near the working face 6 is 1.5m, the bottom of the hole is set in the vertical plane of the side of the roadway 1 near the coal pillar 3 in the mining roadway 1, and the bl...

Embodiment 2

[0037] like Figure 4 ~ Figure 5 Shown, present embodiment coal seam thickness M is 5m, specifically comprises the following steps:

[0038] Step 1: Arranging the top-cut roadway 2

[0039] The coal seam 7 is a thick coal seam 7, and the mining roadway 1 is used as the top cutting roadway 2;

[0040] Step 2: Arranging blast holes 4 and control holes 5

[0041] In the coal seam 7 and the roof rock layer 8 above the entire roof cutting roadway 2, inclined blast holes 4 and control holes 5 are longitudinally arranged, and the control holes 5 are arranged in the middle position between adjacent blast holes 4; the blast holes 4 and the control holes 5 is 1.5m away from the roadway side of the top-cut roadway 2 near the coal pillar 3, the blast hole 4 and the control hole 5 are arranged in parallel in the same vertical plane, and the angle α between the blast hole (control hole) and the coal seam roof is 45° , the distance W between adjacent blasting holes is 10m, the vertical di...

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Abstract

The invention relates to a roof-cutting pressure relief method in hard-roof deep-hole pre-splitting blasting, belongs to the technical field of blasting pressure relief, relates to a method of controlling coal pillar stress concentration and intense gob-side entry strata behaviors caused by suspension of gob hard roofs in thick seams and super high seams, and solves such problems of coal pillar stress concentration and intense gob-side entry strata behaviors caused by suspension of gob hard roofs in thick seams and super high seams. The method is effective and widely applicable and includes the steps of firstly, reserving a roof-cutting roadway in coal pillars along a seam roof before working face extraction in case of the seam being the super high seam; if the seam is the thick seam, directly using a mining roadway as a roof-cutting roadway; secondly, if the seam is the super high seam, longitudinally reserving blast holes in the roof strata above the roof-cutting roadway; and thirdly, loading explosives, sealing the holes and allowing for roof-cutting blasting.

Description

technical field [0001] The invention belongs to the technical field of pressure relief by blasting, and relates to a method for preventing and controlling the stress concentration of coal pillars caused by the suspension of the hard roof of goafs in thick coal seams and ultra-thick coal seams and the strong mine pressure appearance along goaf roadways, in particular to a hard roof Roof cutting and pressure relief method for deep hole pre-splitting blasting. Background technique [0002] In the mining of thick coal seams and extra-thick coal seams, especially when the roof is a multi-layered hard rock formation with large thickness, as the working face advances, a cantilever beam of a certain length is formed with the coal pillars as the support point and does not collapse. Overburden. With the periodic pressure of the working face, the roof of this layer inclines to the goaf at a certain angle, and the falling gangue is difficult to fill the gob, the lateral concentrated st...

Claims

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Application Information

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IPC IPC(8): F42D3/00
Inventor 张宏伟朱志洁陈蓥霍丙杰兰天伟
Owner LIAONING TECHNICAL UNIVERSITY
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