In the Beginning… There is the Earth
Tunnel project on the D518 local road; at “Les Grands Goulets”, between Pont-en-Royans and La Chapelle-en-Vercors: 1,710 m long, 7 m carriageway, 6 emergency galleries. The objective of this project is to open up the Vercors and ensure the safety of users, who run the risk of falling rocks on the D518’s current route.
Definition of the geological model at the level of the upstream head: performing 2 cored boreholes and 2 destructive soundings totalling 320 linear metres with deferred diagraphies and laboratory tests, performing 4 subhorizontal cored boreholes totalling 270 linear metres with deferred diagraphies, laboratory tests, and equipping the bore-holes for performing explosive testing.
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