Safe distance for blasting
Blasting hazards: blasting earthquakes, air shock waves, scattered debris, toxic gases. Blasting must determine the scope and safety distance of blasting hazards, and set up warning and safety protection measures.
① Safe distance for blasting flying stones
Minimum safe distance for individual flying stones
Shallow hole blasting to break large blocks
Shallow hole blasting
200m (not less than 300m under complex terrain conditions or without a stepped working surface)
Deep hole blasting
As designed, but not less than 200m
When blasting along a mountain slope, the safety distance of flying rocks in the downhill direction should be increased by 50%< Br/>
② Safe distance for blasting earthquake
The blasting Seismic wave has a destructive effect on buildings and open slope. The blasting seismic intensity is related to the explosive quantity of the blasting section, the distance of the blasting source, the rock characteristics, the blasting method and the geological and topographic conditions. Take measures to control the amount of explosives and control blasting techniques, such as millisecond, smooth, pre splitting, and buffer blasting.
nine hundred and one
③ Air shock wave safety distance
Consider the impact of air shock waves on people, buildings, and gun shelters.
Blasting operations with blasting action index n<3:
Firstly, determine the safety distance between individual flying objects and earthquakes
Secondly, design and determine the safety distance for air shock wave protection< Br/>
nine hundred and two