ABSTRACT
Within the framework of CIGEO project, 5 shafts with depth over 500 m and effective diameter between 6 and 8.50 m are to be constructed, to meet the needs for the construction works and the operation phase. The last experiences in deep shaft construction in France are 15 years old, there is currently no project including such structures. Moreover, the evolution of the regulations and the specific requirements of the CIGEO project are increasing the complexity of these structures. The issues in terms of security of the works, durability, water tightness, ventilation, and works extension are essential aspects of the design. Even if the shafts are sunk independently from the other structures construction, they must be efficiently integrated in the global project. This article will focus on the sinking methods and the design chosen to fit the best to the project, and how they were adapted as the constraints and the requirements evolved.
