Heading shaped crack blasting method suitable for high-stress ore bodies

Abstract

The invention discloses a heading shaped crack blasting method suitable for high-stress ore bodies. The row interval between front-row main blasting gun holes (2) and rear-row main blasting gun holes(4) is 2.5-3.0 times that of a conventional retreating type sectional blasting manner, and a row of heading cracking holes (3) is formed between the front-row main blasting gun holes (2) and the rear-row main blasting gun holes (4). Bidirectional shaped charging devices are mounted in the heading cracking holes (3). The bidirectional shaped charging devices comprise charging pipes, and cross-shaped energy gathering grooves are formed in the charging pipes. The heading cracking holes (3) carry out detonation 15-17 ms earlier than the front-row main blasting gun holes (2), and the rear-row mainblasting gun holes (4) carry out detonation 17-25 ms later than the front-row main blasting gun holes (2). According to the method, unit consumption is reduced by 15% to 20%, the gun hole blasting output per meter hole is increased by 18.5% to 20.5%, and the blasting effect is greatly improved; and the boulder yield is reduced by 35.7%, and the problems that in the high-stress mine ore body extraction process, the unit consumption of explosives is high, and the energy utilization rate is low are solved.

Description

technical field [0001] The invention belongs to the technical field of mine blasting and mining, and in particular relates to a mine advance cracking blasting technology, which is particularly suitable for vertical downward hole blasting of deep ore bodies or rock bodies where the blasting clamping effect is large, the blasting quality is poor, and the blasting effect is not ideal. Applicable, it can also improve the blasting quality and reduce the blasting cost for shallow low-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 depth of deep well mining in Australia, Canada, South Africa and other countries is generally 1000-2900m, and the deepest reaches 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 be mi...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of high explosive unit consumption, low energy utilization rate and poor blasting effect caused by the interposition of blasted ore body due to high stress in deep metal ore deposits, the present invention proposes a single explosive with good blasting effect and low bulk rate. A method suitable for advanced energy-gathering fracturing blasting of high-stress ore bodies with low consumption and high energy utilization

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