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Overall context

Geotechnics (not only) of Switzerland Major railroad constructions Gotthard base tunnel (GBT) Bastian Bommer-Denss. Overall context. The new transalpine rail routes (NEAT - Neue Eisenbahn-Alpentransversale). Bundesamt für Verkehr BAV. Content. Overall context. Geological context.

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Overall context

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  1. Geotechnics (not only) of SwitzerlandMajor railroad constructionsGotthard base tunnel (GBT)Bastian Bommer-Denss

  2. Major railroad constructions: Gotthard base tunnel (GBT) Overall context • The new transalpine rail routes (NEAT - Neue Eisenbahn-Alpentransversale) Bundesamt für Verkehr BAV Content Overall context Geological context Geotechnicalproblems Costs

  3. Major railroad constructions: Gotthard base tunnel (GBT) Overall context • The new Gotthard rail link (longer, flatter and faster) (2016/17) (2019) Bundesamt für Verkehr BAV Content Overall context Geological context Geotechnicalproblems Costs

  4. Major railroad constructions: Gotthard base tunnel (GBT) Geological context • Gotthard base tunnel – Geological profile AlpTransit Gotthard AG Die Zeit 42/2010 Content Overall context Geological context Geotechnicalproblems Costs

  5. Major railroad constructions: Gotthard base tunnel (GBT) Geotechnical problems • Preliminary study 1992 • 950 m • Partiallysqueezing rock -> comprising sheared and folded Serizit phyllites (cataclasite) • 2910 m • Extreme squeezing rock -> intensively crumbled, kakiritic mica gneisses, mica slates and mica phyllites • 150 - 250 m • Liquid rock with high water pressure-> sugar-grained Dolomite • 400 m • Talus material from rockfall-> unconsoli-dated rock AlpTransit Gotthard AG Tunnel 4/2004 Content Overall context Geological context Geotechnicalproblems Costs

  6. Major railroad constructions: Gotthard base tunnel (GBT) Geotechnical problems • Sedrun Part-Section AlpTransit Gotthard AG Tunnel 4/2004 Content Overall context Geological context Geotechnicalproblems Costs

  7. Major railroad constructions: Gotthard base tunnel (GBT) Geotechnical problems • Sedrun Part-Section • TZM North • Geotechnically trickiest section • 1 km long, with 1000 m overburden AlpTransit Gotthard AG Tunnel 4/2004 Content Overall context Geological context Geotechnicalproblems Methode Vorgehen Ergebnisse Zeitplan

  8. Major railroad constructions: Gotthard base tunnel (GBT) Geotechnical problems • Sedrun Part-Section • Geol. exploration • Five exploratory drillings • One penetrated the entire TZM • => Intensively crumbled, kakiritic micas AlpTransit Gotthard AG Tunnel 4/2004 Content Overall context Geological context Geotechnicalproblems Costs

  9. Major railroad constructions: Gotthard base tunnel (GBT) Geotechnical problems • Sedrun Part-Section • Information about the danger patterns • Triaxialtests • Extreme squeezingbehaviour • capacity to close the cavity • Loosening phenomena and caving behaviour at the face and on the fringe • Securing the cavity Tagungsband Swiss Tunnel Congress 2008 Tunnel 4/2004 Content Overall context Geological context Geotechnicalproblems Costs

  10. Major railroad constructions: Gotthard base tunnel (GBT) Geotechnical problems • Sedrun Part-Section • Cavity support • to resist large permissible deformations of up to 70 cm radially • Deformable steel arches (double ring) every 1 m, 66 cm or 33 cm • Anchoring system with radial anchors of up to 12 m in length Tunnel 4/2004, Swiss Tunnel Congress 2008, IUT’ 02 Content Overall context Geological context Geotechnicalproblems Costs

  11. Major railroad constructions: Gotthard base tunnel (GBT) Geotechnical problems • Sedrun Part-Section • Choice driving method • Conventional driving with tunnel excavators (shovels, picks and ripper teeth) • On account of squeezing rock AlpTransit Gotthard AG IUT’02 Content Overall context Geological context Geotechnicalproblems Costs

  12. Major railroad constructions: Gotthard base tunnel (GBT) Geotechnical problems • Situation 2010 • 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) • Difficult Intschi zone crossed without problem with an average daily advance of 6 m by TBM (6/2004) • 950 m • Partiallysqueezing rock -> comprising sheared and folded Serizit phyllites (cataclasite) • 1000 m • Extreme squeezing rock -> intensively crumbled, kakiritic mica gneisses, mica slates and mica phyllites • 150 - 250 m • Liquid rock with high water pressure-> sugar-grained Dolomite • 400 m • Talus material from rockfall-> unconsoli-dated rock AlpTransit Gotthard AG Tunnel 4/2004 Content Overall context Geological context Geotechnicalproblems Costs

  13. Major railroad constructions: Gotthard base tunnel (GBT) Geotechnical problems • Unexpected 2003 • 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 AlpTransit Gotthard AG Tunnel 4/2004 Content Overall context Geological context Geotechnicalproblems Costs

  14. Major railroad constructions: Gotthard base tunnel (GBT) Costs • The Costs of the AlpTransit Gotthard Project (2010) Total costs: CHF 13.157 billion (Gotthard route with the Gotthard and Ceneri Base Tunnels) AlpTransit Gotthard AG Kurzfassung NEAT-Standbericht 2010 / I Content Overall context Geological context Geotechnicalproblems Costs

  15. Thank you! Questions?

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