| Classification | TYPE Ⅰ Micro-vibration excavation method | TYPE Ⅱ Precision vibration-controlled blasting | TYPE Ⅲ·Ⅳ Vibration-controlled blasting | TYPE Ⅴ General blasting | TYPE Ⅵ Large-scale blasting | |
| Small scale | Medium scale | |||||
| Method overview |
A method by which vibration can be reduced to a level within the TYPE II method around the security object, and where secondary crushing is executed using a large-scale breaker. |
A method by which secondary crushing by a large-scale breaker is executed after generation of cracks in bedrock using a small amount of explosives. |
A method by which regulation standards can be complied with via execution of a blasting design in accordance with "test blasting" results when the security object exists within the influential sphere of blasting. |
A method applied to an area separated from a security object to the extent that the maximum charge per hole can meet the regulation standards for blasting. |
A method that considers only blasting efficiencies in mountainous remote areas, etc. in which no security objects exist within the influential sphere of blasting. |
|
| Main explosives or blast supplies in use | Explosives less than the minimum unit for micro-vibration crusher, micro-vibration crushing, etc. | Emulsion-based explosives | Emulsion-based explosives | Emulsion-based explosives |
Main explosive : ammonium nitrate fuel oil explosive Priming explosive : emulsion |
|
| Charge amount per hang fire (kg) | Explosive standard less than 0.125 | 0.125∼0.5 | 0.5∼ 1.6 | 1.6 ∼ 5.0 | 5.0∼15.0 | More than 15.0 |
| Bored hole diameter | Less than 51mm | Less than 51mm | Less than 51mm | More than 76mm | More than 76mm | More than 76mm |
| Boring equipment | Selection and use of air compressor-type crawler drill or hydraulic crawler drill | |||||
| Standard pattern | Micro-vibration excavation method | Precision vibration-controlled blasting | Vibration-controlled blasting | General blasting | Large-scale blasting | |
| Small scale | Medium scale | |||||
| Boring depth(m)※ | 1.5 | 2.0 | 2.7 | 3.4 | 5.7 | 8.7 |
| Minimum resistance wire(m)* | 0.7 | 0.7 | 1.0 | 1.6 | 2.0 | 2.8 |
| Boring interval(m)* | 0.7 | 0.8 | 1.2 | 1.9 | 2.5 | 3.2 |
| Standard charge per hang fire(kg) | - | 0.25 | 1.0 | 3.0 | 7.5 | 20.0 |
| Crushing extent | Only cracks generated (less than average rock) | Shredding + Crack | Shredding + Crack | Shredding + Boulder | Shredding + Boulder | |
| Measurement management | Mandatory | Mandatory | Mandatory | Optional | Optional | |
| Blasting protection hole | Mandatory | Mandatory | Mandatory | Not required | Not required | |
| Secondary shredding | Large breaker application | Large breaker application | - | - | - | |