Matt SykesAndy KervellYung LooHeidi CloughCraig Sturzaker
ARUP: Update on GIS Model and tunnel options under lake
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Contents
• Definition of Study Area• Update on GIS tool Development- Current Status- Further Steps
• Potential outcomes examples and decisions• Tunnel construction optioneering- Lake crossing: Bored/IMT
• Next Steps
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Study Area
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Study Area
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Update on GIS Decision Support Tool
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User Inputs
• Alignments of 6 FCC Options• Interactive alignment location on map• Alter Shaft locations (10%) - slidebar• Select Tunnel Depth - slidebar• Select Tunnel Gradient - slidebar
Outputs
Dynamic Chart:• Profile surface elevation and geology• Profile of tunnel• Shaft Locations • Warnings when tunnel above ground levelDynamic Tables:• Depth to tunnel (mBGL)• Shaft Length intersecting geology layer• % age of tunnel intersecting geology
Current Status
Depth (mBGL)
(Length of ShaftIntersecting Layer)
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Future DevelopmentGIS Decision Support Tool:
• Addition of Geology Layers• Addition of Hazard layers (?)• Adjust gradient inflection point• Export of Results – table/report
Future Analytical Functions:
• Export of user selected 3D alignment to GIS layer
• Intersection with Geological hazards + results
• 3D Visualisation (desktop) in ArcScene/ browser (?)
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Diagram of Solution
PHP Web Server
PostGreSQL
PostGIS
UsersCERNGADZArup
Web Browser ClientJavascript Dimension ChartingCrossFilter
Web Server Interface Layer(PHP Script)
Spatial Database(on Server)
• Select Tunnel Alignment• Move Alignment within study area• Select Shaft position, tunnel depth &
gradient
• Visualise alignment / shaft on map• Send final alignment to database• Calculate shaft location @10% circumference• Charting of surfaces / shaft locations• Calculation & presentation of statistics for
tables
• Create points (@1%) from alignment geometry
• Intersect points with surface/geology layers• Return XYZ at every point to Client
• Application security• Client / Database interface
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GIS Tool – Future Steps
• Integration of GADZ data- Extension of Quaternaire-Molasse layer- Molasse – Crétacé layer
• Geohazard layers- (http://infoterre.brgm.fr/viewerlite/MainTileForward.do)
• Decision Aid Possibilities• GeoMol
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GIS Tool – Future Steps
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Lake Crossing: Tunnelling Considerations
• Bored/IMT Construction Methods- Excavation Technology - Ground conditions, geotechnical risk- Logistics: Segmental vs prefab and casting basin- Long term durability: Stability, joints, maintenance & operation- Environmental: Spoil disposal, dredging, ship impacts- Energy: Power and fuel consumption- Cost and programme
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Lake Crossing: Tunnelling Considerations
Superficial sediments
Moraine
Molasse
Fiore et al. 2011, Würmian deglaciation of western Lake Geneva (Switzerland) based on seismic stratigraphy
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Lake Crossing: Tunnelling Considerations
EPBM
Slurry TBM
Slurry TBM IMTSuperficial sediments
Moraine
Molasse
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Lake Crossing: Tunnelling Considerations
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Fehmarnbelt Fixed Link
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Next Steps• Completion of GIS tool• Integration of GADZ data• Produce preliminary optioneering screening results
