Back break is an undesirable phenomenon in blasting operations. It refers to damage extending beyond the intended excavation line during rock blasting, typically behind the last row of blast holes.
This unwanted effect is problematic in various applications, especially in mining, quarrying, and construction, as it compromises the integrity of the remaining rock mass.
Consequences of Back Break
According to the reference, back break has several negative impacts, making it a critical issue to control in blasting operations. These consequences can significantly affect safety, operational efficiency, and economic outcomes.
- Instability of mine walls: Back break weakens the rock structure, leading to unstable walls that pose a significant safety risk.
- Falling down of machinery: Damage to the surrounding rock caused by back break can increase the likelihood of equipment being damaged or falling into the blast area.
- Improper fragmentation: Instead of achieving the desired rock size distribution for easy handling and transport, back break can result in overly large or uneven fragments.
- Reduced efficiency of drilling: When preparing for subsequent blasts, drilling can become more difficult and less efficient due to the fractured and unstable conditions created by back break.
Mitigating back break is essential for maintaining safe working conditions, achieving proper excavation profiles, and optimizing downstream processes like loading, hauling, and crushing.