Deep hole blasting method for increasing bulky productivity of joint fracture developed granite mine

Abstract

The invention discloses a deep hole blasting method for increasing the bulky productivity of a joint fracture developed granite mine. The aspects such as drilling, powder charging and detonation of regular deep hole blasting methods are subjected to technical modification, and during mine production, deep hole blasting methods, capable of increasing the bulky productivity, such as drilling at the angle of 45 degrees relative to the trend of a stratum joint fracture (2), distribution of nearly square holes, detonation of low detonation speed explosive and three-phase spaced powder charging are adopted, on the premise that detonation safety and other relevant requirements are met, the bulky productivity is obviously increased, the unit consumption of the detonation explosive can be reduced to 0.2kg / m<3>, the comprehensive miming cost is obviously lowered, and good economic benefits are brought to mine enterprises.

Description

technical field [0001] The invention relates to the field of mining engineering, in particular to a deep hole blasting method for increasing the yield of large blocks in granite mines where joints and fissures develop. Background technique [0002] At present, in the granite open-pit mines with developed joints and fissures, the blasting method generally adopts the conventional deep-hole blasting method aimed at reducing the yield of large blocks. The conventional deep-hole blasting method has low yields of large blocks and high yields of flakes and fines The yield of large pieces (50~120cm) is generally less than 30%, and the yield of flakes and fine ore is generally greater than 70%, and it is easy to produce foundations and umbrella rocks. The unit consumption of blasting explosives is high, and the cost of blasting is high. Contents of the invention [0003] The object of the present invention is to provide a deep hole blasting method for increasing the yield of large ...

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Problems solved by technology

[0002] At present, in the granite open-pit mines with developed joints and fissures, the blasting method generally adopts the conventional deep-hole blasting method aimed at reducing the yield of large blocks. The conventional deep-hole blasting method has low yields of large blocks and high yields of flakes and fines. The yield of large pieces (50~120cm) is generally less than 30%, and the yield of flakes and fine ore is generally greater than 70%, and it is easy to produce roots and umbrella rocks. The unit consumption of blasting explosives is relatively high, and the cost of blasting is relatively high

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