Download - FCC Tunnel Civil Engineering and Geology
FCC Tunnel Civil Engineering and Geology
John Osborne (CERN GS-SE) 4 April 2014
John Osborne (CERN) 2
• 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) 3
Potential locations• 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 4
1980’s :LEP 30km and 27km tunnel locations 2001 : VLHC 240km tunnel location1997 : VLHC 113km tunnel location
John Osborne (CERN GS-SE)
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
5John Osborne (CERN GS-SE)
Possible machine layouts
6P.Lebrun
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Single tunnel, longitudinal ventilation
FCC I&O meeting, 140326 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
11
Double tunnel
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
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Riskwater
ingressheaving ground
weak marls
hydrocarbons
support &
lining
ground response & convergenc
e
hydrostatic pressure
& drainage
Pollution of
aquifers
effect of
shafts on
nature
effects of
shafts on
urban areas
Total
Option 1
5 3 0 0 5 4 5 5 4 2 33
Option 2
2 0 3 3 3 3 2 2 3 2 23
Option 3
…….
1 0 2 2 2 2 1 1 2 5 18
High
LowFeasibility
John Osborne (CERN GS-SE)
• 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 ?• Optimise shaft positions to
minimise depth (+/- 2km ?)• Bypass tunnels instead of
shafts ?
John Osborne (CERN) 13
Next Steps
John Osborne (CERN) 14