Propagation refers to?

Propagation refers to?

• A. Sympathetic detonation of a charge caused by shock from an adjacent borehole
• B. A gradual burn of a fuse without detonation
• C. The air blast
• D. The excavation method

Answer: (A)

Propagation in blasting means the transmission of detonation from one charge to neighboring charges, often via the shock wave in rock, which can trigger a second charge without a separate initiation. This is known as sympathetic detonation and is a key consideration in blast design because spacing, stemming, and timing control whether nearby charges will detonate in response to another. It’s not about a fuse slowly burning, it isn’t the air overpressure produced by a blast itself, and it isn’t the method used to excavate rock.

Propagation in blasting means the transmission of detonation from one charge to neighboring charges, often via the shock wave in rock, which can trigger a second charge without a separate initiation. This is known as sympathetic detonation and is a key consideration in blast design because spacing, stemming, and timing control whether nearby charges will detonate in response to another. It’s not about a fuse slowly burning, it isn’t the air overpressure produced by a blast itself, and it isn’t the method used to excavate rock.