Water-mist dust settling method implemented during blast excavation for large-scale underground project

Abstract

The invention discloses a water-mist dust settling method implemented during blast excavation for a large-scale underground project. The water-mist dust settling method include steps of 1), forming main blast holes in a blast excavation area of an underground cavern, placing a row of elongated water bags made of polyethylene materials at positions close to a working plane or between a first row of the main blast holes and a second row of the main blast holes, and arranging emulsion explosive packages under the water bags; 2), connecting the emulsion explosive packages under the water bags into a detonation network; 3), completing preparation for blast work in the blast excavation area, enabling detonation conditions to be met, and then filling water into the water bags until the water is uniformly filled in the water bags; 4), detonating and forming water mist to absorb dust generated during blasting of rocks, and settling the dust under the effect of the gravity. The size of each water bag is 6-10X0.5-0.9X0.13-0.16, and the distance between each two adjacent water bags is 2-4m. In order to guarantee convenience in recycling the water bags after blasting and a good water-mist effect, the emulsion explosive packages under the water bags need to be equidistantly and uniformly arranged under the water bags, and simultaneous detonation of the emulsion explosive packages needs to be guaranteed to the greatest extent. When the emulsion explosive packages are connected into the network, the detonation time of the emulsion explosive packages is 25-50ms ahead of the detonation time of the corresponding main blast holes which are detonated at first.

Description

Technical field [0001] The invention belongs to the technical field of engineering blasting, and specifically relates to a water mist dust reduction method for large-scale underground engineering blasting excavation, especially a water mist dust reduction method for large-scale underground cavern group blasting construction. Background technique [0002] In the blasting and excavation of large underground projects, due to frequent blasting operations and small space, the dust produced by blasting is suspended and drifted in the air for a long time, and it is difficult to dissipate, which poses great harm to the workplace, the environment and human health. At present, it is difficult to meet the needs of large-scale underground projects only by means of ventilation and improved blasting construction techniques. The main component of blasting dust is SiO 2 , Clay and silicate materials, etc., have strong hydrophilicity, so wet dust reduction method has gradually become the main dus...

AI Technical Summary

Problems solved by technology

For large-scale underground projects, the space is relatively small, the blasting operations are more frequent, and there are many parallel excavation work faces, and the blasting dust is difficult to dissipate. The dust suppressi

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