A method suitable for advanced energy-gathering fracturing blasting of high-stress ore bodies

Abstract

The invention discloses a method suitable for advanced energy-gathering fracturing blasting of high-stress ore bodies. 2.5 to 3.0 times the row spacing of the stage blasting method, a row of advanced cracking holes (3) is set between the front row of main blasting holes (2) and the rear row of main blasting holes (4); The center is equipped with a two-way shaped charge device; the two-way shaped charge device contains a charge tube, and the charge tube is provided with a cross-shaped charge groove; Detonation takes place in 15-17ms, and the blasting of the main blasting holes (4) in the rear row is delayed by 17-25ms compared with the main blasting holes (2) in the front row. The method of the present invention reduces the unit consumption by 15-20%, increases the blasting volume of blasting holes by 18.5-20.5%, greatly improves the blasting effect, reduces the large block rate by 35.7%, and solves the problem of explosives in the mining process of high-stress mines. Problems such as high unit consumption and low energy utilization rate.

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 2016-2020, more than 50 metal mines in my country will be mined below 1000m underground, and nearly half of them will reach a depth of more th...

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

Images