Pressure relief presplitting blasting gob-side entry retaining pillar-free mining method

A technology of pre-split blasting and mining methods, applied in ground mining, mining equipment, earth-moving drilling and other directions, can solve problems such as roadway deformation and roadway maintenance difficulties, reduce maintenance costs, improve resource recovery rate, and facilitate maintenance. Effect

Inactive Publication Date: 2015-07-08
杨洪兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the embodiment of the present invention is to provide a mining method without coal pillars in the gob-side retaining roadway by pressure-relieving pre-splitting blasting, a

Method used

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  • Pressure relief presplitting blasting gob-side entry retaining pillar-free mining method
  • Pressure relief presplitting blasting gob-side entry retaining pillar-free mining method
  • Pressure relief presplitting blasting gob-side entry retaining pillar-free mining method

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Embodiment 1

[0056] Diamond Coal Mine is located in Shiban Town, Dazhou City, Sichuan Province, 27km away from Dazhou and about 30km away from Dazhou Railway Station.

[0057] The construction process of pressure-relieving pre-splitting blasting in gob-side entry retaining without coal pillars is as follows:

[0058] (1) The first mining face is constructed along the groove from top to bottom.

[0059] (2) Anchor cable construction at the working face along the trench 50m ahead.

[0060] (3) Lag face 2-5m construction pre-splitting blast hole.

[0061] (4) 5-10 blastholes are constructed each time. After the blastholes are constructed, they are charged and blasted in time, and 5 blastholes are blasted each time. Each blast hole shall be inspected by the blaster before charging each time. If the blast hole is affected by the mining pressure and cannot be filled with shaped charges, the blast hole must be cleaned; the length of the mud seal after charge shall not be less than 1.0m.

[006...

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Abstract

The invention discloses a pressure relief presplitting blasting gob-side entry retaining pillar-free mining method. The method comprises carrying out reinforced support on a tunnel to be subjected to pressure relief presplitting blasting gob-side entry retaining before working face mining, carrying out roof presplitting blasting oriented joint-cutting before working face mining so that the connection of the reserved tunnel and a goaf roof in a certain depth range, in working face mining, gradually feeding the tunnel subjected to roof oriented presplitting blasting into a goaf, carrying pressing by an upper roof so that the goaf roof is broken and sinks and a tunnel is automatically formed, and utilizing the reserved machined tunnel as an air way of the next working face. The pressure relief presplitting blasting gob-side entry retaining pillar-free mining method is free of slope expansion and dinting of a tunnel, improves a resource recovery rate, relieves excavation replacement, is conducive to tunnel maintenance, reduces a tunnel maintenance cost and reduces worker labor intensity.

Description

technical field [0001] The invention belongs to the field of mine mining, and in particular relates to a coal pillar-free mining method for gob-side entry retention by pressure-relieving pre-splitting blasting. Background technique [0002] In coal mining, the use of traditional masonry materials and roadway sheds to protect the roadway is seriously deformed, especially the deformation of the roof and floor is the most serious. In order to meet the requirements of safe production, it is usually necessary to carry out maintenance operations such as side expansion and undercover. maintenance poses great difficulties. Contents of the invention [0003] The purpose of the embodiments of the present invention is to provide a mining method without coal pillars in the gob-side retaining roadway by pressure-relieving pre-splitting blasting, aiming to solve the problems of serious roadway deformation and difficult roadway maintenance using traditional masonry materials and stones a...

Claims

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Application Information

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IPC IPC(8): E21C41/18E21D21/00
CPCE21C41/18E21D21/00E21D21/0006
Inventor 杨洪兴唐睿
Owner 杨洪兴
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