Offshore Geotechnical Engineering Dave White
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Transcript of Offshore Geotechnical Engineering Dave White
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Offshore (geotechnical) engineering
David White
Centre for Offshore Foundation Systems
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Offshore (geotechnical) engineering
Offshore pipelines
Research techniques/tools
Research questions
Geomaterials science within COFS
Wider offshore (geotechnical) engineering at COFS
Potential links across faculty
Research tools
Common research ground
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Australias offshore pipelines
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Pipeline research techniques
Experimental
In situNumerical
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Pipeline research questions
Sleeper Pipeline
Alignment
in operation
Remnant berm
from hydrotest
As-laid
alignment
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Pipeline research questions
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A new geotechnical design context
Conventional engineering
stable structures on
an intact seabed
Modern pipeline design
mobility and transformation
structure and seabed
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Geomaterials science
0
0.2
0.4
0.6
0.8
1
1.2
0 10 20 30 40
Currentresistance/originalresis
tance
Cycle number
0
0.2
0.4
0.6
0.8
11.2
1.4
0.0001 0.001 0.01 0.1 1
Residualstressratio,res/'n
o
Velocity (mm/s)
Numbers indicate cycle number
1
1
11
20
5
5
With consolidation
intervals between cycles
Without consolidationintervals between cycles
Soil P (SILT)
HardeningReconsolidation
Solid fluidtransformation
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Example future WA developments
Cardoso & Oliviera 2010
Image courtesy of Woodside Energy Ltd
Image: Inpex / DMP annual
review
Image: Shell
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Related COFS research
Cardoso & Oliviera 2010
Image courtesy of Woodside Energy Ltd
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Future plan: ARC Centre forGeotechnical Science and Engineering (-2017)
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Wider links? Research tools
Numerical modelling Large deformation FE
Material point methods
Physical modelling
Centrifuges
O-tubes
Sensing, control and
acquisition
Image analysis
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Wider links? Common ground
CGSE Cross-pollination,
offshore onshore
civil engineering
Geomaterials
Potential links
offshore mining
Future energy
Renewables
wind, wave
Liquefaction?
JU punchthrough: 19 fatalities ever (reported)Cargo liquefaction: 66 in 18 months (reported)