ABSTRACT
For underground works, especially for long and deep tunnels, the design project is based on uncertain parameters and conditions. The main objective of the risk management process is to secure the technical, contractual, financial, completion time and operational safety issues. The new railway base tunnel located in the Alps, between France and Italy (TELT’s project), named Mont Cenis based tunnel, is a typical example of long and deep tunnel which is 57.5km long. This paper describes a completed case of risk management for the Operational Construction sites 6 and 7 of the TELT’s project between Saint-Martin-La-Porte and Villarodin-Bourget/Modane (France). During the design phase, a global risk management plan (PMR) lists and describes each risk, identified by the Engineers and the Project Owner. The risk management is daily managed with three stakeholders (Owner, Engineer and Contractor) and requires several appropriate tools which are developed around the PMR: graphic illustration, risk description forms (for each risk and geological conditions), monitoring sheet (risk occurrence).
