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  Tunnelling Studies for CERN’s Future Circular Collider

  CERN, the European Organisation for Nuclear Research, has started planning for a future upgrade of their particle accelerator complex located in the Geneva basin, straddling the France/Swiss border.Studies are currently under way for the planning and construction of the Future Circular Collider (FCC) project which will allow the scientific community to expand their knowledge on particle collisions at high energies. In order to achieve this goal, the FCC will require extensive civil underground infrastructure including a 100km long 6m diameter circular tunnel, 20 large shafts, several caverns with spans of up to 30m and multiple connecting tunnels and galleries. These structures will be built in a variety of ground conditions from hard limestone and molasses to water bearing glacial deposits. This paper discusses the project layout and planning challenges.

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