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Tunnelling Under the Thames

Alan Spray Ted Allen. Tunnelling Under the Thames. Docklands Light Railway (DLR) Woolwich Extension. Geological Context. Initially Alluvium, gravels and Bullhead beds Water-bearing Upper Chalk Non-Clastic Carbonate Cretaceous period Medium – wide joints

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Tunnelling Under the Thames

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  1. Alan Spray Ted Allen Tunnelling Under the Thames Docklands Light Railway (DLR) Woolwich Extension

  2. Geological Context • Initially Alluvium, gravels and Bullhead beds • Water-bearing Upper Chalk • Non-Clastic Carbonate • Cretaceous period • Medium – wide joints • Large flints – non carbonate • Relative strengths

  3. The Problem • Flint damage • Water-bearing chalk • Maintenance – dry refuges

  4. Solution Adopted • Drilled until cutter broke • Intensive pumping - luck • Repairs to cutter • Dig heading • Replacements/reinforcements • Welding

  5. Alternatives • Stronger cutters • Better investigation • More remedial works • Build a bridge

  6. Thanks for Listening

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