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Stratified blasting method for coal mine hard roof

A technology for hard roof and coal mine, which is applied in the field of blasting of coal mine roof, can solve the problems of imperfect hard roof blasting technology, and achieve the effect of operability, high efficiency and safe production of coal mine.

Active Publication Date: 2012-09-12
DATONG COAL MINE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that the existing hard roof blasting technology is

Method used

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  • Stratified blasting method for coal mine hard roof
  • Stratified blasting method for coal mine hard roof
  • Stratified blasting method for coal mine hard roof

Examples

Experimental program
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Effect test

Embodiment Construction

[0012] A layered blasting method for a hard roof in a coal mine, comprising the following steps,

[0013] (1) On the roof c of the mining face, use a drilling rig to drill a number of evenly distributed vertical boreholes a. The depth of each borehole a is the sum of the height e of the immediate roof and the height f required to break the old roof. Within the range of the height f of the old roof fracture, the borehole a has several wedge-shaped groove pre-cracks b along its depth;

[0014] (2) Each borehole a is charged, the number of charge layers is the same as the number of wedge-shaped groove pre-cracks b, the length of each layer of charge is the same as the distance between two adjacent wedge-shaped groove pre-cracks b, and the wedge-shaped groove pre-cracks are guaranteed b is located in the middle of each layer of charge. The charge step includes sending the priming charge, gun soil and wooden wedges into the borehole in sequence. The priming charge includes explosiv...

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Abstract

The invention discloses a stratified blasting method for a coal mine hard roof, and solves the problem that the conventional hard roof blasting technology is imperfect. The stratified blasting method for the coal mine hard roof comprises the following steps of: drilling a plurality of uniformly distributed drilling holes on the roof on a stope face by utilizing a hydraulic or pneumatic percussion drill, and drilling wedge-shaped pre-cracks along the drilling holes; feeding primary explosive, gun soil and a wood wedge into each drilling hole in sequence by utilizing a wooden stick; striking the outer end of the wooden stick by using a hammer, so that the wooden wedge is tightly clamped in each drilling hole; filling the gun soil to seal each hole; connecting a detonator to a detonating cord; and luting and connecting to a blasting network to implement detonation. By the method, the stratified blasting of a hard roof is realized by filling explosives in a stratified way and forming the wedge-shaped pre-cracks in the vertical direction; the process is simple, operable, low in cost and high in benefit; potential hazards of the roof can be eliminated; and therefore, coal mine production safety is realized.

Description

technical field [0001] The invention relates to a blasting method for a coal mine roof, in particular to a layered blasting method for a hard roof of a coal mine. Background technique [0002] The occurrence of coal seams in some mining areas has the obvious characteristics of "two hardness", that is, hard coal seams and hard roofs. The control technology of the hard roof has always been a difficult problem in the world's mining industry. Due to the hard roof, strong integrity, strong roof pressure, and strong mine pressure, from the large-area roof pressure in the 1950s and 1960s to the hard and suspended roof of comprehensive mechanized mining today, the roof steps of the working face sink, etc. Accidents of collapsed jacks, and even serious rockbursts, will pose a serious threat to safe production. Generally speaking, the methods of controlling the roof, including artificial forced caving, water injection softening of the roof, hydraulic fracturing, oblique blasting of...

Claims

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Application Information

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IPC IPC(8): F42D1/08
Inventor 于斌穆秉清刘锦荣
Owner DATONG COAL MINE GRP
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