Ground vibration and air blast overpressure assessment using scaled distance

Abstract

In recent years there was a noticeable developmental activity, especially in industrial as well as construction sectors such as roads, harbours, condominiums etc. This has enhanced and developed aggregate industry and the use of modern technology for its effective operation. Blasting is being used extensively to supply rock aggregates for construction and also to drive tunnels and roads through rugged rocky terrains. There is growing concern on blasting effects on the environment such as dust, toxic gases, noise, fly rock and ground vibration. Worldwide the common allegations mainly focused on damages to residences. Present study was carried out to monitor air blast and ground vibration due to rock blasting. Southern Highway expressway was selected to monitor above effects due to high blast frequency available and the availability of the vast data base. Geological condition of the site, including rock type, drilling and explosive parameters, and distance between blasting and monitoring location, ground vibration and air blast over pressure were recorded. The data was used to develop site specific constants useful for blast programming. By using the site factors, the quantity of explosive per delay or the vibration at particular range of distance could be predicted.