Explosion safety distance Blasting hazards: blasting-induced earthquakes, air shock waves, scattered rocks, toxic gases. Blasting must determine the scope of blasting hazards and the safety distance, and set up warning and safety protection measures.
① Safety distance for blasting flying stones
| Blasting type |
The minimum safe distance for individual flying stones |
| Shallow-hole blasting for breaking large blocks |
300m
|
| Shallow-hole blasting |
200 meters (not less than 300 meters in complex terrain conditions or when there is no formed step working face) |
| Deep-hole blasting |
As designed, but not less than 200 meters |
When conducting blasting along the slope, the safety distance for flying rocks in the downhill direction should be increased by 50%.
② Safety distance for blasting-induced earthquakes Explosive seismic waves can cause damage to buildings and open slopes. The intensity of explosive seismic waves is related to the amount of explosives in the blasting section, the distance from the blasting source, the characteristics of the rock, the blasting method, and the geological and topographical conditions. Measures such as controlling the amount of explosives and controlling blasting techniques, such as delay blasting, smooth blasting, pre-splitting blasting and buffer blasting, can be adopted.
③ Safety distance for air shock waves Take into account the impact of air shock waves for people, buildings and anti-gun shelters.
Blasting operations with a blasting index n less than 3: First, determine the individual dispersion distance and the earthquake safety distance. Secondly, the safety distance for protecting against air shock waves is determined.
Product
