Blast hole arrangement mode and explosive charging structure adopting backward type sectioning-based ore body blasting

Abstract

The invention discloses a blast hole arrangement mode and explosive charging structure adopting backward type sectioning-based ore body blasting. A row distance between front row main blast holes (2)and rear row main blast holes (4) is 2.8 m to 3.3 m, and a row of advanced crack blast holes (3) are arranged between the front row main blasting holes (2) and the rear row main blasting holes (4); and a two-way shaped explosive charging device is arranged in each advanced crack blast hole (3), each two-way shaped explosive charging device comprises explosive charging pipes, a cross-shaped shapedgroove is formed in each explosive charging pipe, the series-connected explosive charging pipes and plugging covers at the two ends of the explosive charging pipes form the two-way shaped explosive charging device, and the two-way shaped explosive charging device is suspended in the corresponding advanced crack blast hole through a detonating cord. The blast hole arrangement mode and explosive charging structure has the advantages of good blasting effect, low large lump rate, low explosive unit consumption and high energy utilization rate, and solves the problems, caused by the high stress environment of a deep mine, of high explosive unit consumption, low energy utilization rate and the like in the ore recovery process.

Description

technical field [0001] The invention belongs to the technical field of mine blasting and mining, and is particularly suitable for blasting in a vertical downward hole mode for deep high-stress ore bodies. Background technique [0002] With the gradual reduction of shallow mine resources, deep mining has become an inevitable trend of future mining development. The mining depth of deep wells in Australia, Canada, South Africa and other countries is generally 1000-2900m, with the deepest reaching 4800m. According to statistics and forecasts, during the period from 2016 to 2020, more than 50 metal mines in my country will be mined below 1000m underground, and nearly half of them will reach a depth of 1500m or more in the next 10 to 20 years. [0003] As the mining depth increases, the in-situ stress in the ore body and rock also increases gradually. The mining of deep metal deposits is faced with the special mining environment of high stress, high well temperature and high wel...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of high explosive unit consumption, low energy utilization rate and poor blasting effect caused by high stress in deep metal ore deposits, the present invention proposes a single explosive with good blasting effect and low bulk rate. Blast hole layout and charge structure of the ore body by retreating segmental blasting with low energy consumption and high energy utilization rate

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