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Longhole pressure-bearing blasting method of hard coal rock

A coal rock and deep hole technology, which is applied in the field of hard coal rock deep hole pressure blasting, can solve the problems of poor hard roof effect and achieve the effect of severe damage, high energy utilization rate and less generation

Inactive Publication Date: 2017-01-11
DATONG COAL MINE GRP
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of poor effect of conventional blasting roof control measures on hard roofs, the present invention provides a pressure-bearing blasting method for hard coal rock deep holes

Method used

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Examples

Experimental program
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Embodiment Construction

[0013] The hard coal rock deep hole pressure blasting method comprises the following steps,

[0014] (1) First use the drilling rig for coal mine tunnel exploration to carry out the caving hole construction, and then use the rock drill to carry out the construction of the charge hole. 15° and 20°, large-diameter guide holes are drilled between the charging holes;

[0015] (2) The charge hole and the guide hole are charged alternately at intervals. For compatible explosives, plastic wrapping or sealing wax sealing and isolation measures should be taken. The charge package is placed in the corresponding position in the hole through the fixing device, and the lead wires of the explosives are marked in order and then close to each other. The hole wall leads to the outside of the hole;

[0016] (3) Use a special sealing device with a liquid injection pipe and a liquid discharge pipe to seal the hole. The length of the sealing hole is 1 / 3 of the hole depth. There is a liquid injec...

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Abstract

The invention particularly provides a longhole pressure-bearing blasting method of hard coal rock and solves the problem that a conventional blasting roof control measure has a poor effect for a hard roof. The longhole pressure-bearing blasting method of the hard coal rock comprises following steps: roof caving hole construction is performed; then construction of charging holes is performed, the charging holes are 35 m long, angles of elevation are 9 degrees and 13 degrees, level angles are set as 15 degrees and 20 degrees, and large-diameter guiding holes are formed between the adjacent charging holes; the charging holes and the guiding holes are subjected to alternate spaced charging, a special hole sealing device provided with a liquid injection pipe and a drain pipe is adopted to seal orifices, and blasting is executed after liquid injection. With the adoption of the method, the utilization rate of explosive energy is high, only 70% of traditional explosive dosage is needed, the degree of damage to the coal surface is more severe, and the blasting is more efficient.

Description

technical field [0001] The invention relates to an underground coal mine blasting method, in particular to a hard coal rock deep hole pressure blasting method. Background technique [0002] The implementation of conventional blasting roof control measures for hard roofs always has the characteristics of low explosive energy utilization rate, large amount of dust and harmful gases, uneven damage degree of roof weakening, serious local damage, and poor overall control effect. The technology is also limited by technical equipment conditions, and the existing high-pressure water equipment is difficult to meet the weakening and cracking requirements of the hard roof. Contents of the invention [0003] In order to solve the problem of poor effect of conventional blasting roof control measures on hard roofs, the invention provides a pressure-bearing blasting method for hard coal rock deep holes. [0004] The present invention is realized by adopting the following technical schem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D1/08F42D3/04
CPCF42D1/00F42D1/08F42D3/04
Inventor 田利军杨敬轩刘长友刘宏旺刘锦荣许清起高瑞程剑新张小荣杨培举
Owner DATONG COAL MINE GRP
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