ROAD CONSTRUCTION IN A MOUNTAIN SITE WITH A HIGH RISK OF ROCK FALLS (FRANCE) AND OTHER APPLICATIONS IN PUBLIC WORKS

ABSTRACT

The use of Daveytronic^® digital detonators for blasting operations began at the end of 1998, following approval by INERIS (the French Industrial and Environmental Certification Body), and has increased regularly each year since.

Electronic detonators have been used in all areas of blasting:

- quarrying,
- mining,
- road construction,
- trenching,
- tunnelling,
- demolition.

with, in each case, a great improvement in the blasting techniques.

This article will focus on three main projects carried out with Daveytronic^® :

- road construction in a mountain site with a high risk of rock falls (Pas de la Reyssolle - France),
- trench blasting for a new tramway line in the city of Nantes (France),
- tunnel construction, 5 to 20 m under the city of Porto ( Portugal ).

The blasting methods used and the way the blasting patterns were designed will be presented.
The improvements in terms of work duration and overall cost savings will also be discussed.

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