A method of charging explosives in coal mine roadway blasting cut hole

Abstract

The invention discloses a power increasing powder charging method for a coal mine roadway blasting cuthole. The method is suitable for improving quality of the coal mine roadway blasting cuthole and reducing the boulder yield. A detonator and an explosive are loaded into the bottom of the blasthole cuthole, a leg wire is led outside a blasthole, and the blasthole is blocked through clay stemming; blasthole blocking is divided into two sections, one section of the first clay stemming no less than 100mm is utilized to seal the explosive in the blasthole, then a bubble bag is loaded into the blasthole behind the first clay stemming, the blasthole cuthole behind the bubble bag is closed through the second clay stemming, and the cuthole is sealed. The increased clay stemming shortens confined space when the explosive starts to explode to a great extent, and therefore blasting initial pressure of explosion gas is increased, and the crushing effect of the explosion gas on rocks is strengthened; power increasing is carried out on the cuthole effect in roadway blasting, so that the boulder yield of the roadway blasting is lowered, the shot hole utilization rate of the roadway blasting is improved, and the cuthole effect is improved.

Description

technical field [0001] The present invention relates to a coal mine roadway blasting cut hole increasing power charge structure, especially a charge structure suitable for enhancing the rock-breaking power of coal mine roadway blast cut hole. This technology can effectively reduce the large block rate and make the Blast heap concentrated. Background technique [0002] The currently used cutting hole charging method, the cutting hole charging structure uses a section of clay gun mud to close the cutting hole, which cannot make good use of the stress wave and explosive gas generated by the explosive explosion, causing a large amount of explosion energy to be released in the rock. Useless dissipation leads to low use efficiency of explosives and low blasting power, resulting in a high rate of rock chunks, long throwing distance, and non-concentrated blasting piles. Therefore, how to design the charging structure of the notch eye is particularly critical. Contents of the inve...

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Problems solved by technology

[0002] The currently used cutting hole charging method, the cutting hole charging structure uses a section of clay gun mud to close the cutting hole, which cannot make good use of the stress wave and explosive gas generated by the explosive explosion, causing a large amount of explosion energy to be released in the rock. Useless dissipation, resulting in low explosive use efficiency and low blasting power, resulting in a high rate of large rocks, long throwing distance, and non-concentrated blasting piles

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