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FCC Tunnel Civil Engineering and Geology

FCC Tunnel Civil Engineering and Geology. John Osborne (CERN GS-SE ) 4 April 2014. Goals of the meeting : Review status of studies Ensure no duplication of tasks Understand what geological data exists Establish where to find additional data BRGM contact Understand the role of GIS

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FCC Tunnel Civil Engineering and Geology

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  1. FCC Tunnel Civil Engineering and Geology John Osborne (CERN GS-SE) 4 April2014

  2. John Osborne (CERN)

  3. Goals of the meeting : • Review status of studies • Ensure no duplication of tasks • Understand what geological data exists • Establish where to find additional data • BRGM contact • Understand the role of GIS • Agree reporting milestones and future review dates John Osborne (CERN)

  4. Potential locations 2001 : VLHC 240km tunnel location 1980’s :LEP 30km and 27km tunnel locations 1997 : VLHC 113km tunnel location • Options for a ring tunnel have been proposed in the past : • Summer 2012 CERN GS-SE group studied the pre-feasibility of an 80km ring tunnel in the CERN area. • Pre-feasibility study of an 80km tunnel project at CERN prepare for the European Strategy for Particle Physics 2012 : http://indico.cern.ch/event/175067/call-for-abstracts/165/file/1.pdf John Osborne (CERN GS-SE)

  5. Potential locations : European Strategy for Particle Physics • Several locations have been studied for the possibility to construct an 80-100km ring tunnel in the CERN area. • Location constraints • CERN area • Connected to LHC/SPS at one point • Limit depth of access shafts John Osborne (CERN GS-SE)

  6. Possible machine layouts P.Lebrun

  7. Single tunnel, longitudinal ventilation

  8. Single tunnel + refuge, longitudinal ventilation FCC I&O meeting, 140326

  9. Single tunnel, transverse ventilation FCC I&O meeting, 140326

  10. Single tunnelwith shielded technical & safety zones FCC I&O meeting, 140326

  11. Double tunnel

  12. Feasibility /Risk Issues of the Options Some examples of issues (needs to be studied in more detail) • Environment • Risk of environmental impacts such as civil engineering, social acceptance, pollution of aquifers etc • Risk of encountering hydrocarbons • Risk of EIA rejection • Costs • Risk of cost increase due to all issues mentioned Feasibility Low High John Osborne (CERN GS-SE)

  13. Next Steps • Develop a geological tool to allow comparison of the various tunnel options • Circumferences, shapes, inclination (max 2%, out of plane ?) etc. to be easily compared • non-planar tunnel ? • Optimiseshaft positions to minimise depth (+/- 2km ?) • Bypass tunnels instead of shafts ? John Osborne (CERN)

  14. John Osborne (CERN)

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