Blasting method for treatment of gob

Abstract

The invention discloses a blasting method for treatment of a gob. The blasting method comprises the following steps: step 1, determining the length and the width of rock formation at the upper part of the gob through tentative drilling, wherein the central axes of blast holes are not perpendicular to the plane where the rock formation lies; step 2, burying explosive and in-hole delay detonators in the blast holes; and step 3, placing an earth surface delay detonator on the earth surface of each blast hole, correspondingly connecting the earth surface delay detonators and the in-hole delay detonators, and igniting the earth surface delay detonators. According to the blasting method for treatment of the gob, provided by the invention, the blast holes that are not perpendicular to the rock formation are drilled on the rock formation at the upper part of the gob, and the delay detonators are buried in the blast holes, so that when the detonators are ignited, the bursting force generated radially acts on the rock formation along the blast holes, then pinpoint blasting is formed and a part of blasting volume is thrown into a waste dump; and the blasting method has the advantages that the shaking force is larger, the breaking degree is higher, the rock formation at the upper part of the gob collapses more completely, the working safety and the stripping efficiency are improved, and a great amount of manufacturing cost is saved because a part of blasting volume is thrown into the waste dump.

Description

technical field [0001] The invention relates to the goaf processing technology of coal mining, in particular to a blasting method for processing the goaf. Background technique [0002] The goaf is a "hole" created by man-made excavation or natural geological movement below the surface. The existence of the goaf makes the safe production of the mine face a great safety problem. Personnel and mechanical equipment may fall into the goaf. [0003] Therefore, the measure taken to the goaf is to use the method of strengthening loosening blasting to blast the rock formation near the goaf. The danger of falling can be avoided when working in the collapsed area. [0004] However, the blasting vibration of this method is small, resulting in a low degree of rock fragmentation, and sometimes incomplete subsidence occurs in the goaf, posing safety hazards. At the same time, the rock formation steps above the gob were not completely blasted, forming larger massive rocks, which affected ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a blasting method for dealing with goafs, so as to solve the defects of small rock blasting vibration and incomplete collapse of goafs in the prior art, and improve work safety

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