To Blast or Not to Blast?

Abstract

When hard rock is excavated in civil construction work, it must either be removed mechanically or be blasted. The fear of accidents or damage claims, and limited knowledge of blasting operations, is causing more and more contractors and owners to opt for mechanical rock excavation methods. In almost all cases, mechanical excavation is much slower and more costly than using controlled blasting methods. This paper describes the concerns that affect this excavation choice issue, and it offers a practical approach for developing controlled blasting programs. Current public perceptions about blasting and risk analysis issues are also explored. Finally, actions—by government and industry—to improve construction blasting safety are offered.