Coal-rock blasting pre-splitting method and device based on packing blasting of liquid explosive in long hole

Abstract

The invention discloses a coal-rock blasting pre-splitting method based on packing blasting of liquid explosive in a long hole, comprising: drilling a long hole in coal-rock mass, preliminarily addinga detonating instrument in the long hole, packing the long hole with a packer having liquid injection and exhausting functions, pumping the liquid explosive into the long hole by means of hydraulic pumping after packing slurry congeals, closing an exhaust pipe stop valve when a continuous flow of the liquid explosive occurs to an orifice exhausting pipe, stopping a liquid explosive pump from pumping, closing a liquid injection pipe orifice stop valve, removing a liquid injection pump delivery pipe from a liquid injection pipe orifice, and connecting wires to allow detonating. Compared with common solid explosives in a long hole, the method has the advantages that the detonating critical dimeter of the liquid explosive is small, delivering is performed conveniently via pumping, explosive charging is not affected by borehole collapse, failure detonation can be avoided, engineering blasting vibrations are slight, static rock breaking is provided under blasting super dynamic load, and themethod is widely applicable to pre-splitting, anti-reflection, pressure relief, impact resistance and other conditions of coal rock.

Description

technical field [0001] The invention relates to a coal rock blasting pre-splitting method and device, especially a method and device that can be used for stress transfer and pressure relief of high-stress surrounding rock, crack increase and permeability enhancement of dense coal rock layers, pre-splitting and caving of hard roofs and containing Coal rock blasting pre-splitting method and device based on liquid explosive sealing and detonation in deep holes for pressure reduction, permeability enhancement and outburst elimination of gas coal seams. Background technique [0002] my country's coal resources are rich in reserves, widely distributed and complex in geological conditions. Due to the massive recovery of coal resources in the past few years, coal mining has gradually moved deeper. Deep coal mining is faced with a series of complex engineering problems caused by high ground stress and hard coal rock. During the deep hole blasting operation of coal mines, the common ...

AI Technical Summary

Problems solved by technology

Deep coal mining is faced with a series of complex engineering problems caused by high ground stress and hard coal rock. In the process of deep hole blasting in coal mines, the common charge blasting technology currently used has the following three technical problems: First, the problem of deep hole drilling

With the lengthening of the drilling depth, especially when drilling through the coal seam, the drilling hole collapses when the drill pipe is pulled out, and the drilling is difficult to form;

With the increase of the drilling length, the amount of charge in the hole increases, and the resistance of the charge in the deep hole increases significantly. With the increase of the drilling elevation angle, it is more difficult to fix and push the charge roll in the hole, especially when encountering the drill In the case of hole collapse, it is almost difficult to realize deep hole charging; thirdly, the frequency of blast rejection in deep hole blasting is high, and it is difficult to deal with dumb guns

Affected by the gap effect of the borehole, the long-distance continuous blasting of the charge coil is limited, and the frequency of detonation rejection increases significantly. Moreover, due to the serious damage to the borehole in the blasted section, it is extremely difficult to dispose of the unexploded charge coil in the deep hole

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