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Seikan Rail Tunnel, Japan

Seikan Rail Tunnel, Japan. By Colin Hall and Tom Watson. Geological History Of Japan. Lies on plate boundaries Volcanic Islands. Tsugaru Strait History. Main link between islands were ferries Typhoon in 1954 claims 1430 lives in the Tsugaru strait between the islands

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Seikan Rail Tunnel, Japan

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  1. Seikan Rail Tunnel, Japan By Colin Hall and Tom Watson

  2. Geological History Of Japan Lies on plate boundaries Volcanic Islands

  3. Tsugaru Strait History • Main link between islands were ferries • Typhoon in 1954 claims 1430 lives in the Tsugaru strait between the islands • Trade limited by the sea

  4. Crossing Solution • Longest railway tunnel in the world, 54km • Second longest underwater, 23km • Work started 1971 • Opened in 1988 at a cost of $3.6bn

  5. Geology N

  6. Construction Simultaneous tunnelling from both ends Traditional tunnelling techniques on dry land with TBM 2800 tonnes of explosive use on blasting the under water rock Project to up-grade for shinkansen rail-line began 2005 1.4 million people employed during construction 168 kilo-tonnes of steel used 6.3 million m3 of earth removed

  7. How Geology Affected Project N Anticipated stronger rock on western strait Many faults Structurally weak sedimentary regions Sea bed largely strong igneous volcanic rocks with interspersed layers of siltstone, shale, tuff, tuff-breccia and mudstone Inconsistent rock

  8. Solutions to problems faced Stopped TBM, started blasting and mechanical picking. Grouting Pumping via pilot tunnel Considering the scale of the project few major problems arose

  9. Thanks for Listening

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