Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.
-
Upload
wesley-richard -
Category
Documents
-
view
221 -
download
3
Transcript of Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.
![Page 1: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/1.jpg)
Yung Loo
25.06.2014
FCC: GIS & Tunnelling Update
![Page 2: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/2.jpg)
2
FCC: GIS & Tunnelling Update
1. GIS Progress
2. Alignment: Horizontal / Laser Straight
3. Data Interpolation
4. Preliminary Findings• LHC Crossing under ATLAS Point 1• Bored vs IMT
• Total Shaft Depths• Risk Matrix
5. Next Steps
![Page 3: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/3.jpg)
3
GIS Tool Development – Current Status
Web-based GIS Decision Aid Tool
Dynamic Chart:• Profile surface elevation
and geology• Profile of tunnel• Shaft Locations • Warnings when tunnel
above ground level
Dynamic Tables:
• Depth to tunnel • Shaft Length through
geology layers• % age of tunnel
intersecting geology• ±3km horizontal
variance in results for shaft depth
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• Select point of inflection of tunnel gradient
Outputs
![Page 4: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/4.jpg)
4
GIS Tool Development – Current Status
Web-based GIS Decision Aid Tool
Dynamic Chart:• Profile surface elevation
and geology• Profile of tunnel• Shaft Locations • Warnings when tunnel
above ground level
Dynamic Tables:
• Depth to tunnel • Shaft Length through
geology layers• % age of tunnel
intersecting geology• ±3km horizontal
variance in results for shaft depth
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• Select point of inflection of tunnel gradient
Outputs
![Page 5: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/5.jpg)
5
GIS Tool Development – Current Status
1 2 3 4 5 6 7 8 9 10
To Develop:
• Cretaceous boundary:• Basement• Massifs Calcaire
• Lake Superficials/Moraine
![Page 6: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/6.jpg)
6
Geographic Reference System
• Alignment Geographic Reference System:- Laser straight / Earth curvature- Geoid- Ellipsoid- Inherent distortion
![Page 7: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/7.jpg)
ILC for CERN Site (Horizontal)
This was ok for ILC
Geographic Reference System
• FCC Tunnel alignment is following Earth curvature and appears horizontal as flattened
when projected with LV95
![Page 8: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/8.jpg)
8
Geographic Reference System
WGS 84 Swiss Lv95
• A geographic coordinate system (WGS84), uses a 3d spherical surface to define locations on the earth.
• A projected coordinate system (Swiss Lv95) is defined on a flat, 2d surface.
• All data uses Swiss Lv95, which effectively ‘flattens’ the data and removes the curvature of the earth.
• Therefore this flattening removes any curvature in the alignment when viewed in profile.
Datasets• Terrain:
Shuttle Radar Topography Mission (SRTM)
• Geology:Le système d'information du territoire à Genève (SITG)
• Coordinate System:SwissLV95
![Page 9: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/9.jpg)
9
Geographic Reference System
• Swiss LV95: Geographic coordinate system- Uses Bessel 1841 ellipsoid- x,y,z derived directly from a fundamental point at Zimmerwald
Federal Office of Topography, swisstopo
![Page 10: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/10.jpg)
10
Geographic Reference System• Scale Distortion: 75-100ppm ~ 2.4-3.1m over 31.8km (~relative 0.7m)
• Meridian Convergence: angular difference from north (-0.9 to -1.0, ~relative 0.1º)
![Page 11: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/11.jpg)
11
Point Interpolation
• PostGIS function which interpolates a point on a line. Location of point is a fraction of total length of the line.
• 1% intervals used. • For 100km alignment, a point every 100m.
83km, a point every 83m.
• All geology information has been converted to raster format using the ‘Topo to Raster’ tool in ArcGIS
• Uses an iterative interpolation technique, based on IDW and kriging.
• Optimised to have computational efficiency of local interpolation methods without losing surface continuity of global interpolation methods.
• Allows for the created DEM to follow abrupt changes in elevation.
![Page 12: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/12.jpg)
P3P1 P7
(450m)(359m) (350m)
FCC (horizontal)
FCC (at grade)
?m
Superficials
MoraineMolasse
Tunnellingunder lake
(330m)(310m)
(230m)
Vertical depth below Point 1
30m
50m130m
Effect of tunnel position on Point 1 connection
![Page 13: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/13.jpg)
Alignment & Tunnelling Type – Preliminary Results
To be updated with Cretaceous geology
Horizontal Alignment: Above GL
![Page 14: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/14.jpg)
14
Lake Crossing: Tunnelling Considerations
IMT Bored Bored Remarks
Ground conditions Superficials Moraine MolasseGeotechnical Risks, with which can
be designed for.
Excavation Technology + + ++
All proven technology at the anticipated depths, lengths &
diameter. More extensive ground treatment in non-molasse options
Logistics: Segmental vs prefab and casting basin
- + +Navigation issues, inland segment
yards, near shore casting yards, floating docks
Long term durability: Stability, joints, maintenance & operation
+ - - Increased joint connections in TBM
Environmental: Spoil disposal, dredging, ship impacts
- + +IMT dredging can be used directly as
construction material
Energy: Power and fuel consumption
+ - -IMT less energy requirements, more
fuel requirements
Cost and programme ? ? ?To determ
ine furth
er in st
age 3
![Page 15: Yung Loo 25.06.2014 FCC: GIS & Tunnelling Update.](https://reader035.fdocuments.us/reader035/viewer/2022062421/56649dcf5503460f94ac39a1/html5/thumbnails/15.jpg)
15
Next Steps- GADZ Cretaceous data inclusion- GIS programming completion and integration- Screening results- Stage 2: Requirements, constraints & alignment optioneering