Presplit blasting method

Abstract

The invention relates to a presplitting explosion method. A row of presplitting holes (3) with small diameters are drilled along designed excavation profile between the exploitation region and the boundary slope. Cushion holes (2) are designed parallel to the presplitting holes (3) and disposed between a main blast hole (1) and presplitting holes (3). The specific steps are as follows: a. determining parameters of the presplitting explosion holes, drilling; b. determining matched explosive load, loaded constitution, loaded ingredients, pack height and explosion initiation manner, implementing explosion. The invention is adaptive to explosion construction of highway cutting, large-scale hydropower station, metal mine exposed for long time. Integrality and stability of boundary rock mass are protected, occurrence of landslip is prevented, good and safe production environment is provided for mine, and good social efficiency and economic efficiency are provided.

Description

technical field [0001] The invention belongs to the technical field of open-pit mining slope protection in mining engineering, and specifically relates to a pre-splitting blasting method for protecting the integrity and stability of boundary slope rocks. Background technique [0002] As we all know, in the production process of open-pit coal mines, they all face the stability problem of the boundary slope. Due to the instability of the slope, hidden dangers such as landslides, large-area rubble and pumice will not only affect the normal production of the mine, cause damage to mechanical equipment, but also seriously threaten the safety of workers. [0003] At present, the effect of pre-splitting blasting on the boundary slope in the mining process of open-pit coal mines is not ideal, because the mining intensity of open-pit coal mines is high, the geological conditions are complex, and the rocks are mostly sedimentary rocks of different lithologies, often appearing in one st...

AI Technical Summary

Problems solved by technology

Due to the instability of the slope, there are hidden dangers of accidents such as landslides, large-scale slabs and pumice, which will not only affect the normal production of the mine, cause damage to mechanical equipment, but also seriously threaten the safety of workers.

[0003] At present, the effect of pre-splitting blasting on the boundary slope in the mining process of open-pit coal mines is not ideal, because the mining intensity of open-pit coal mines is high, the geological conditions are complex, and the rocks are mostly sedimentary rocks of different lithologies, often appearing in one step. rock, therefore, there is no successful pre-splitting blasting case

However, the existing pre-splitting blasting method has the phenomenon that the side rocks are too broken during blasting, causing the electric shovel to over-excavate, or the side impact of the blasting is not in place and the electric shovel cannot be dug in place.

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