01 - introduction presentation
TRANSCRIPT
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CE 306 Geotechnical and
Foundation Engineering
03 credit hours course
Dr Qaiser Iqbal
mailto:[email protected]:[email protected] -
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Foundation engineering
Branch of civil engineering concerned withlinking structures to the Earth.
Foundation engineers must model soil
behaviour. This requires specialist knowledge:opportunities for varied work and individualcontribution. Non-routine.
Key area of offshore engineering. Oil,gas,wind, tidal energy reserves requireoffshore foundation structures.
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Aims
To extend the knowledge and understanding
of soil behaviour obtained from
undergraduate level to the application of a
range of foundation design problems.
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Aims....
Having successfully completed the module, youwill be able to demonstrate an understanding andknowledge sufficient to be able to:
distinguish between different foundation typesand their appropriate use
be able to design shallow and deep foundationsto carry ultimate loads
be able to estimate deformations under workingconditions
understand the impact of intrusive investigationtechniques on soil parameter determination
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Aims ....
be able to select appropriate soil parameters
from site investigation data
have an appreciation of the advantages and
limitations of advanced analytical techniques
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Spot the odd one out
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Foundation types
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Case for foundation design
What are the applied loads, V, H,M?
What are the relevant soil (and
groundwater) properties? Will the foundation fail under the
worst plausible loading (ULS)?
Will unacceptable settlementsoccur under the service load(SLS)?
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Onshore shallow foundations: low rise
buildings
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Onshore shallow foundations: high rise
buildings
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Troll platform during tow-out
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Offshore shallow foundations: gravity
bases
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Offshore shallow foundations: jack-up
drilling rigs
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Offshore shallow foundations: jack-up
drilling rigs
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Offshore Vs Onshore
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Offshore loading conditions: wind and
waves
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Offshore loading conditions: ice
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Comparison of loading conditions
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Onshore deep foundations: bridges
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Onshore deep foundations: bridges
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Onshore deep foundations: tall
buildings
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Parameter Selection
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Parameter Selection...
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Some in-situ test techniques
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CPT
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Onshore shallow foundations:
collapse
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Prediction contest
Load predictions prior
to load test
Full SI provided
Contestants to predict
maximum vertical
loading
Lehane, B.M. 2003. Vertically loaded shallow
Foundation on soft clayey silt. ICE Proc. GE 156 (1)
pp17-26
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Prediction contest - Result
22 entrants
+/- 2x range of
predictions
Widespread disparity in design predictions outlines the
difficulties associated with foundation engineering
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Load testing
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Load vs Settlement
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Field Monitoring
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Physical Modelling - Centrifuge
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Other foundation engineering
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Other foundation engineering