France – Ground investigation work – Accord Cadre Investigations Géotechniques >400m - Accès Alpins Ligne Nouvelle

Implementation of a multi-beneficiary framework agreement with subsequent contracts. The framework agreement subject of this estimate note concerns the execution of very deep boreholes (over 400m), with the aim of obtaining the necessary data for the drafting of geological, hydrogeological and geotechnical synthesis reports for the Chartreuse, Belledonne and Glandon tunnels, and then, depending on the available budget, acquiring new data to address the uncertainties identified following the drafting of these synthesis reports. Works concerned: Chartreuse, Belledonne and Glandon tunnels. Data sought: geological, hydrogeological, geotechnical characteristics and characterization of excavated materials for their use (physical-chemical characterization and management channels). Specifics of the investigations:

• Vertical and inclined boreholes with depths of 400 to 1500m

• Type of boreholes: cored, with some of the boreholes carried out destructively

• Instrumentation: interstitial pressure cells, etc.

• In-situ tests: diagraphies, water tests, dilatometric tests, stress measurements, etc.

• Laboratory tests for geotechnical, hydrogeological and material (MATEX) use characterization.