Improving geological models of projects by risk management: the Ponserand tunnel
There are several possible routes for the project to create a second tube for the Ponserand tunnel (Aigueblanche, Savoie, France). The longest routes pass through the rock mass, benefiting from favourable geological conditions, whereas the shortest is on the slope face between the existing tunnel and the RN90 main road. This variant crosses areas of talus which militate against excavation. Therefore, although the cost of the long variants is quite well established, there are uncertainties regarding the cost of the short variant. With a view to choosing the definitive route, a risk management analysis of the short variant was performed, which allowed for the definition of specific investigations. The investigations carried out for the short variant allowed for the transition from an initial geological model with numerous uncertainties to a second more reliable model (Fig. 4- b). The updating of the cost of the structure after the preliminary investigations reveals a significant reduction of the cost in relation to the initial estimate, finally confirming the short route as the best option. Based on an actual example, this article thus presents a practical application of geological risk management to a tunnel project.
risk management geological model investigation tunnel
Cédric GAILLARD Johan KASPERSKI
Centre d(E)tudes des Tunnels (CETU), 25 avenue Fran(c)ois Mitterrand, case n°1, 69674 BRON Cedex, France
国际会议
西安
英文
166-179
2016-05-25（万方平台首次上网日期，不代表论文的发表时间）