Middle-deep hole blasting ore breaking method for underground mining

Abstract

The invention provides a middle-deep hole blasting ore breaking method for underground mining. The middle-deep hole blasting ore breaking method is a large-array pitch middle-deep hole blasting ore breaking method for underground medium-thickness inclined bed mining. The middle-deep hole blasting ore breaking method comprises dividing ore into ore pieces along a growth direction and an incline direction, carrying out accurate mining cutting of the ore pieces to form an excavation, and carrying out middle-deep hole blasting ore breaking. Concretely, the middle-deep hole blasting ore breaking method comprises the following steps of 1, carrying out one-step rowing arrangement of middle-deep holes along the growth direction of the ore pieces, and driving each row of the middle-deep holes into a central main blast-hole group, a top plate pre-cracking blast-hole group and a bottom plate throwing blast-hole group in a blasting order, 2, simultaneously drilling a group of first blast holes in front of each row of the middle-deep holes, 3, through a millisecond delay blasting ore breaking technology, blasting the group of the first blast holes, and orderly blasting the central main blast-hole group, the top plate pre-cracking blast-hole group and the bottom plate throwing blast-hole group, and 4, after blasting ore breaking, carrying out ore removal by large-scale trackless shovel equipment. The middle-deep hole blasting ore breaking method solves the problem that the open-stope mining method has poor stoping efficiency, and performs the capacity of the large-scale trackless shovel equipment to the maximum degree.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to a blasting method for mining underground mines with medium-thick inclined layered ore bodies. Background technique [0002] At present, in the underground mining of medium-thick inclined layered ore bodies, the open-field mining method is generally adopted, and the open-field mining method mostly adopts shallow hole blasting for ore removal. When shallow hole blasting is used for ore removal, the drilling depth is generally 2 to 3 m, the amount of ore blasting is small, and large-scale trackless mining equipment cannot be used effectively, resulting in high labor intensity for workers, low mining efficiency, high ore loss rate, high consumption of explosives, detonators and other blasting materials, and gradually increases with the goaf , shallow hole rock drilling and blasting construction has serious potential safety hazards; this method cannot meet the requirements ...

AI Technical Summary

Problems solved by technology

[0002] At present, in the underground mining of medium-thick inclined layered ore bodies, the open-field mining method is generally adopted, and the open-field mining method mostly adopts shallow hole blasting for ore removal. When shallow hole blasting is used for ore removal, the drilling depth is generally 2 to 3 m, the amount of ore blasting is small, and large-scale trackless mining equipment cannot be used effectively, resulting in high labor intensity for workers, low mining efficiency, high ore loss rate, high consumption of explosives, detonators and other blasting materials, and gradually increases with the goaf , there are serious potential safety hazards in shallow hole rock drilling and blasting; this method cannot meet the requirements of high efficiency, safety, low cost, and low loss in the field of ore mining technology

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