geotechnics (not only) of switzerland major railroad constructions gotthard base tunnel (gbt)...
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![Page 1: Geotechnics (not only) of Switzerland Major railroad constructions Gotthard base tunnel (GBT) Bastian Bommer-Denss](https://reader034.vdocuments.us/reader034/viewer/2022051412/5513cae155034679748b49fe/html5/thumbnails/1.jpg)
Geotechnics (not only) of SwitzerlandMajor railroad constructionsGotthard base tunnel (GBT)
Bastian Bommer-Denss
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10. April 2023
Major railroad constructions: Gotthard base tunnel (GBT)
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Overall context
> The new transalpine rail routes (NEAT - Neue Eisenbahn-Alpentransversale)
Content Overall context
Geological context CostsGeotechnical
problems
Bundesamt für Verkehr BAV
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10. April 2023
Major railroad constructions: Gotthard base tunnel (GBT)
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Overall context
> The new Gotthard rail link (longer, flatter and faster)
Content Overall context
Geological context CostsGeotechnical
problems
Bundesamt für Verkehr BAV
(2016/17)
(2019)
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10. April 2023
Major railroad constructions: Gotthard base tunnel (GBT)
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Geological context
> Gotthard base tunnel – Geological profile
Content Overall context
Geological context CostsGeotechnical
problems
AlpTransit Gotthard AGDie Zeit 42/2010
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10. April 2023
Major railroad constructions: Gotthard base tunnel (GBT)
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Geotechnical problems
> Preliminary study 1992
Content Overall context
Geological context CostsGeotechnical
problems
AlpTransit Gotthard AGTunnel 4/2004
- 950 m- Partially
squeezing rock -> comprising sheared and folded Serizit phyllites (cataclasite)
- 2910 m- Extreme
squeezing rock -> intensively crumbled, kakiritic mica gneisses, mica slates and mica phyllites
- 400 m- Talus material
from rockfall-> unconsoli-dated rock
- 150 - 250 m- Liquid rock with
high water pressure-> sugar-grained Dolomite
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10. April 2023
Major railroad constructions: Gotthard base tunnel (GBT)
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Geotechnical problems
> Sedrun Part-Section
Content Overall context
Geological context CostsGeotechnical
problems
AlpTransit Gotthard AGTunnel 4/2004
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10. April 2023
Major railroad constructions: Gotthard base tunnel (GBT)
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Geotechnical problems
> Sedrun Part-Section
Content Overall context
Geological context Methode VorgehenGeotechnical
problems Ergebnisse Zeitplan
AlpTransit Gotthard AGTunnel 4/2004
TZM North
-Geotechnically trickiest section
-1 km long, with 1000 m overburden
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10. April 2023
Major railroad constructions: Gotthard base tunnel (GBT)
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Geotechnical problems
> Sedrun Part-Section
Content Overall context
Geological context CostsGeotechnical
problems
AlpTransit Gotthard AGTunnel 4/2004
Geol. exploration-Five exploratory drillings-One penetrated the entire TZM=> Intensively crumbled, kakiritic micas
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10. April 2023
Major railroad constructions: Gotthard base tunnel (GBT)
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Geotechnical problems
> Sedrun Part-Section
Content Overall context
Geological context CostsGeotechnical
problems
Tagungsband Swiss Tunnel Congress 2008Tunnel 4/2004
Information about the danger patterns
Triaxial testsExtreme squeezing behaviourcapacity to close the cavityLoosening phenomena and caving behaviour at the face and on the fringeSecuring the cavity
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Major railroad constructions: Gotthard base tunnel (GBT)
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Geotechnical problems
> Sedrun Part-Section
Content Overall context
Geological context CostsGeotechnical
problems
Cavity support-to resist large permissible deformations of up to 70 cm radiallyDeformable steel arches (double ring) every 1 m, 66 cm or 33 cmAnchoring system with radial anchors of up to 12 m in length
Tunnel 4/2004, Swiss Tunnel Congress 2008, IUT’ 02
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Major railroad constructions: Gotthard base tunnel (GBT)
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Geotechnical problems
> Sedrun Part-Section
Content Overall context
Geological context CostsGeotechnical
problems
Choice driving method
-Conventional driving with tunnel excavators (shovels, picks and ripper teeth)
On account of squeezing rock
AlpTransit Gotthard AGIUT’02
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10. April 2023
Major railroad constructions: Gotthard base tunnel (GBT)
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Geotechnical problems
> Situation 2010
Content Overall context
Geological context CostsGeotechnical
problems
AlpTransit Gotthard AGTunnel 4/2004
- 950 m- Partially
squeezing rock -> comprising sheared and folded Serizit phyllites (cataclasite)
- 1000 m- Extreme
squeezing rock -> intensively crumbled, kakiritic mica gneisses, mica slates and mica phyllites
- 400 m- Talus material
from rockfall-> unconsoli-dated rock
- 150 - 250 m- Liquid rock with
high water pressure-> sugar-grained Dolomite
- Difficult Intschi zone crossed without problem with an average daily advance of 6 m by TBM (6/2004)
- Squeezing Rock Conditions Successfully Overcome: breakthrough took place nine months ahead of schedule (TZM)(10/2007)
- Piora syncline definitively and successfully mastered with an average daily advance of 10 to 12 m by TBM. The rock was stable. No deformations and no water. (2/2009)
- Firsts breakthrough in the GBT with special driving method (11/2002)
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10. April 2023
Major railroad constructions: Gotthard base tunnel (GBT)
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Geotechnical problems
> Unexpected 2003
Content Overall context
Geological context CostsGeotechnical
problems
AlpTransit Gotthard AGTunnel 4/2004
- Fault zone: Squeezing rock in Faido multifunction station (1/2003)
Investigating fault zone Redisposition of the FMS 24 months delay additional costs of 500 million
CHF
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Major railroad constructions: Gotthard base tunnel (GBT)
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Costs
> The Costs of the AlpTransit Gotthard Project (2010)
Total costs: CHF 13.157 billion (Gotthard route with the Gotthard and Ceneri Base Tunnels)
Content Overall context
Geological context CostsGeotechnical
problems
AlpTransit Gotthard AGKurzfassung NEAT-Standbericht 2010 / I
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Thank you! Questions?