a case study of embankment construction on soft alluvial soils in limerick, ireland
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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 PresentationTRANSCRIPT
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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
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Where are we?
North west Europe…
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Where are we? – Zoom 1
Ireland…
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Where are we? – Zoom 2
West Ireland…
River Shannon
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Where are we? – Zoom 3
West of Limerick
River Shannon
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The approach to Limerick Tunnel
River Shannon
Highway embankments on soft alluvial soils
Submerged tunnel
Cross section to be studied
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View south towards the tunnel
Buggy & Curran (2011)
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Continuing south: Killarney & Lakes (Ladies view)
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Heading north: Cliffs of Moher
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Bypassing Limerick through the tunnel
Buggy & Curran (2011): Figure 1Cross section to be studied
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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
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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
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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
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Simplified cross section 4+150
8.75m embankment
3m soft silt/clayglacial till
26m
2
1
GWL
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Undrained shear strength for 4+100 – 4+180 segment
cu=0.3xpo’
design profile
CPT 517
CPT 516