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A case study of embankment construction on soft alluvial soils in Limerick, Ireland

A case study of embankment construction on soft alluvial soils in Limerick, Ireland. Trevor Orr, Trinity College, Dublin, Ireland Marina Pantazidou , National Technical University of Athens, Greece. Where are we?. North west Europe…. Where are we? – Zoom 1. Ireland….

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A case study of embankment construction on soft alluvial soils in Limerick, Ireland

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  1. A case study of embankment construction on soft alluvial soils in Limerick, Ireland Trevor Orr, Trinity College, Dublin, Ireland Marina Pantazidou, National Technical University of Athens, Greece

  2. Where are we? North west Europe…

  3. Where are we? – Zoom 1 Ireland…

  4. Where are we? – Zoom 2 River Shannon West Ireland…

  5. Where are we? – Zoom 3 River Shannon West of Limerick

  6. The approach to Limerick Tunnel River Shannon Highway embankments on soft alluvial soils Submerged tunnel Cross section to be studied

  7. View south towards the tunnel Buggy & Curran (2011)

  8. Continuing south: Killarney & Lakes (Ladies view)

  9. Heading north: Cliffs of Moher

  10. Bypassing Limerick through the tunnel Cross section to be studied Buggy & Curran (2011): Figure 1

  11. Different earthwork types along highway ground improvement: vertical drains & surcharge chainage 0+000 Cross section to be studied at chainage 4+150 Buggy & Curran (2011): Figure 10

  12. Geologic profile in the vicinity of cross section at chainage 4+150 CPT 516 CPT 517 topsoil 3m glacial till 4+150 limestone 2.9m alluvial clay/silt

  13. Cross section 4+150 25.6m 2.75m surcharge 11m class 2C fill 8.75m embankment: required height for motorway 2 0.5m drainage layer class 6C fill 1 1 1 3m soft silt/clay Drains at a 1.3m center-to-center distance glacial till & limestone

  14. Simplified cross section 4+150 26m 8.75m embankment 2 1 GWL 3m soft silt/clay glacial till

  15. Undrained shear strength for 4+100 – 4+180 segment cu=0.3xpo’ CPT 517 CPT 516 design profile

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