Controlled blasting methods for excavating rock and concrete near critical structures

摘要

In construction and mining work, situations occasionally occur where hard rock or concrete must be excavated at locations near critical structures or utilities. Fearing damage from blasting, contractors and engineers often explore the viability of using mechanical methods or expansive concrete to facilitate the excavation work. In some cases, the high cost and slow progress rates associated with alternate methods or other limiting conditions, makes the use of these methods impractical. In these situations, controlled blasting methods can be efficiently used if properly designed and managed. This paper describes and demonstrates methods for determining the feasibility of high risk blasting work and outlines methods used to manage their design and execution to ensure successful results.