Deep hole pre-splitting and blasting method in primary mining and primary caving process of extra-thick coal seam working face

A technology of pre-splitting blasting and extra-thick coal seam, which is applied in blasting and other directions, and can solve problems such as the lack of methods to improve the coal recovery rate during the initial mining and initial discharge of extra-thick coal seams

Inactive Publication Date: 2019-12-10
XISHAN COAL ELECTRICITY GRP
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The invention solves the problem of lack of a method for improving the coal recovery rate during the initial mining and initial discharge of extra-thick coal seams, and provides a method for deep hole pre-splitting blasting during the initial mining and initial discharge of extra-thick coal seam working faces

Method used

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  • Deep hole pre-splitting and blasting method in primary mining and primary caving process of extra-thick coal seam working face
  • Deep hole pre-splitting and blasting method in primary mining and primary caving process of extra-thick coal seam working face

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Embodiment Construction

[0022] The deep hole pre-splitting blasting method during the initial mining and initial discharge of the extra-thick coal seam working face is realized by the following steps:

[0023] 1) Carry out the first deep hole pre-splitting blasting on the whole working face before operation, specifically:

[0024] 1) A bolter drill equipped with a φ42 alloy steel drill bit is used for blasthole construction (compared with traditional construction drilling, which is safer, faster and more efficient), and a blasthole is constructed between adjacent supports. Perpendicular to the top plate, the blast holes are arranged at the 200mm outward of the bracket cut-off line (the hinge of the hydraulic support top beam and the cover beam);

[0025] 2) Construct the charge pipe, one end of the φ40mm×4000mm PVC pipe is filled with 300mm loess, and from the other end, 3 rolls of gunpowder, 1 roll of blasting primer, 3 rolls of gunpowder, 1 roll of blasting primer, and 3 rolls are sequentially load...

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Abstract

The invention relates to an extra-thick coal seam caving and mining method, in particular to a deep hole pre-splitting and blasting method in the primary mining and primary caving process of an extra-thick coal seam working face. The problem that a method for increasing the coal recovery rate in the extra-thick coal seam primary mining and caving process is lacked is solved. According to the deephole pre-splitting and blasting method, a deep hole circulating blasting technology is adopted, the innovative means are used in the hole drilling process and the explosive loading process, the integrity of a top plate is broken after blasting, a top coal rock layer collapses in time, a coal gangue cushion layer is formed, the coal caving distance is shortened, and the coal recovery rate is greatly increased. The top coal cavability of two ends is improved, and one more support of top coal resources can be recovered at both the machine head and the machine tail. The primary coal drawing interval is reduced by 17 m. Thus, economic benefits are increased.

Description

technical field [0001] The invention relates to a coal mining method with top coal caving in an extra-thick coal seam, in particular to a pre-split blasting method for initial mining and deep hole pre-splitting in a working face of an extra-thick coal seam. Background technique [0002] With the gradual mining of coal resources in each mining area of ​​the mine, the top-coal caving face is gradually facing the situation of tunneling in the face of the goaf and back mining of the island face. The top coal caving performance is poor, and the recovery rate of coal resources is low during the initial mining and caving period. Due to the lack of corresponding countermeasures, generally, coal mining is not carried out 30-40m before the initial mining, and only coal mining is carried out. Generally, the coal mining height is between 2-4m. For extra-thick coal seams, coal mining during the initial mining Failure to draw coal results in a huge loss of coal mass. Contents of the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D1/08
CPCF42D1/00F42D1/08
Inventor 边俊奇刘少杰何福胜赵启安兰晓江陈志平李国辉靳造造亢鹏飞马腾王宗贵
Owner XISHAN COAL ELECTRICITY GRP
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