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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…. - PowerPoint PPT Presentation
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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…
Where are we? – Zoom 2
West Ireland…
River Shannon
Where are we? – Zoom 3
West of Limerick
River Shannon
The approach to Limerick Tunnel
River Shannon
Highway embankments on soft alluvial soils
Submerged tunnel
Cross section to be studied
View south towards the tunnel
Buggy & Curran (2011)
Continuing south: Killarney & Lakes (Ladies view)
Heading north: Cliffs of Moher
Bypassing Limerick through the tunnel
Buggy & Curran (2011): Figure 1Cross section to be studied
Different earthwork types along highway
Buggy & Curran (2011): Figure 10
ground improvement: vertical drains & surcharge
chainage 0+000
Cross section to be studied at chainage 4+150
Geologic profile in the vicinity of cross section at chainage 4+150
3m glacial till
limestone 4+150 2.9m alluvial clay/silt
topsoil
CPT 517CPT 516
Cross section 4+150
8.75m embankment: required height for motorway
2.75m surcharge
3m soft silt/clayglacial till
& limestone
11m class 2C fill
0.5m drainage layer class 6C fill
25.6m
2
11
1
Drains at a 1.3m center-to-center distance
Simplified cross section 4+150
8.75m embankment
3m soft silt/clayglacial till
26m
2
1
GWL
Undrained shear strength for 4+100 – 4+180 segment
cu=0.3xpo’
design profile
CPT 517
CPT 516
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