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