1st Edition

Frontiers in Offshore Geotechnics Proceedings of the International Symposium on Frontiers in Offshore Geotechnics (IS-FOG 2005), 19-21 Sept 2005, Perth, WA, Australia

Edited By Susan Gourvenec, Mark Cassidy Copyright 2005
    1130 Pages
    by CRC Press

    This book addresses current and emerging challenges facing those working in offshore construction, design and research. Keynote papers from leading industry practitioners and academics provide a comprehensive overview of central topics covering deepwater anchoring, pipelines, foundation solutions for offshore wind turbines, site investigation, geohazards and emerging Australian frontiers. A further 125 peer reviewed papers introduce and analyse the critical challenges of offshore geotechnical engineering in the areas of the keynote subjects as well as piling, caissons and shallow foundation systems. The papers collected in these proceedings report a variety of numerical and theoretical investigations, experimental programs and field experience, with established design methods discussed alongside state-of-the-art practices.

    Keynote papers
    Suction anchors for deepwater applications
    Vertically loaded plate anchors for deepwater
    Australian frontiers – spudcans on the edge
    Suction caissons for wind turbines
    Pipeline geotechnics – state-of-the-art
    An operator’s perspective on offshore risk assessment and geotechnical design in geohazard-prone areas
    Offshore site investigations: new frontiers

    Deepwater developments: drag and plate anchors
    Influence of anchor geometry and soil properties on numerical modeling of drag anchor behavior in soft clay
    The effect of interface friction on the performance of drag-in plate anchors
    Proposed upper bound analysis for drag embedment anchors in soft clay
    Ultimate pullout capacity of SBM’s VErtically Loaded Plate Anchor (VELPA) in deep sea sediments
    Effects of long term loading on storm capacity of vertically loaded anchors
    An experimental and numerical study of rate effects for plate anchors in clay
    Vertical pullout behavior of plate anchors in uniform clay
    Pullout capacity of circular plate anchors in double-layered clays
    The use of inflatable anchors in offshore sandy soils

    Deepwater developments: suction caissons
    Suction caisson soil displacement during installation
    Lessons learned from several suction caisson installation projects in clay
    Centrifuge tests on axial capacity of suction caissons in clay
    Evaluation of recovery of wall friction after penetration of skirts with laboratory and field tests
    Study of sand heave formation in suction caissons using Particle Image Velocimetry (PIV)
    Electrokinetic and electrochemical stabilization of caissons in calcareous sand
    Vertical uplift capacity of suction caisson in clay
    Capacity of suction caissons under inclined loading in normally consolidated clay
    A failure surface for caisson foundations in undrained soils
    Parametric finite element analyses of suction anchors
    Centrifuge modelling of suction piles in clay
    Establishing a model testing capability for deep water foundation systems
    Reliability-based design considerations for deepwater mooring system foundations
    Validation of the use of beam-column method for suction caisson design
    Validation of the use of finite element method for suction caisson design

    Developments in the Australian frontiers
    Geotechnical interpretation for the Yolla A Platform
    Preloading of drag anchors in carbonate sediments
    The geotechnical performance of Deep Penetrating Anchors in calcareous sand
    Seabed geotechnical characterisation with a ball penetrometer deployed from the Portable Remotely Operated Drill
    Static and cyclic behavior of laterally loaded piles in calcareous sand

    Foundation solutions for offshore wind turbines
    Design aspects of monopiles in German offshore wind farms
    Finite element modelling of horizontally loaded monopile foundations for offshore wind energy converters in Germany
    Tripods with suction caissons as foundations for offshore wind turbines on sand
    The tensile capacity of suction caissons in sand under rapid loading
    Moment loading of caissons installed in saturated sand
    The theoretical modelling of a suction caisson foundation using hyperplasticity theory

    Shallow foundations: vertical bearing capacity
    Bearing capacity of parallel strip footings on non-homogeneous clay
    Study on bearing behaviors of foundations on multi-layer subsoil
    Numerical study of shallow foundations on calcareous sand
    Undrained bearing capacity of shallow foundations on structured soils
    An investigation into the vertical bearing capacity of perforated mudmats

    Shallow foundations: combined loading
    Yield loci for shallow foundations by ‘swipe’ testing
    Investigating 6 degree-of-freedom loading on shallow foundations
    Single surface hardening model – a system law to describe the foundation-soil interaction
    Bearing capacity of strip footings subjected to complex loading
    Numerical analysis of bearing capacity of foundation under combined loading
    Centrifuge tests on improving offshore foundation systems

    Shallow foundations: mobile jack-up units
    Extraction of jackup spudcan foundations
    Numerical simulation of the breakout process of an object at the ocean bottom
    Spudcan penetration in sand overlying clay
    Punch-through of spudcan foundations in two-layer clay
    Influence of jack-up operation adjacent to a piled structure
    FE modelling of spudcan – pipeline interaction
    Jack-up footing penetration and fixity analyses

    Breakwater caissons and liquifaction
    Performance of caisson breakwater subjected to breaking wave loads
    An interaction model for seismic stability analysis of caisson type structure
    Progressive ocean wave modelling in drum centrifuge
    Numerical analysis of dynamic response of seabed under random wave loading

    Pipelines
    The performance of pipeline ploughs in layered soils
    Physical and numerical modelling of lateral buckling of a pipeline in very soft clay
    Bearing capacity and large penetration of a cylindrical object at shallow embedment
    Stability design of untrenched pipelines – geotechnical aspects
    Pipeline-seabed interaction analysis subjected to horizontal cyclic loading
    A numerical model of onset of scour below offshore pipelines subject to steady currents
    Arctic seabed ice gouging and large sub-gouge deformations
    Model tests to simulate riser-soil interaction in touchdown point region

    Capacity of piles in sand
    Results from axial load tests on pipe piles in very dense sands: the EURIPIDES JIP
    CPT-based design method for steel pipe piles driven in very dense silica sands compared to the Euripides pile load test results
    Bearing capacity of driven piles in sand, the NGI approach
    The UWA-05 method for prediction of axial capacity of driven piles in sand
    An updated assessment of the ICP pile capacity procedures
    A general framework for shaft resistance on displacement piles in sand
    Field research into the effects of time on the shaft capacity of piles driven in sand
    Design criteria for pipe piles in silica sands
    Estimating the end bearing resistance of pipe piles in sand using the final filling ratio
    Evaluation of end-bearing capacity of open-ended piles driven in sand from CPT data
    Evaluation of end-bearing capacity of closed-ended pile in sand from cone penetration data
    The influence of effective area ratio on shaft friction of displacement piles in sand
    A centrifuge study of the monotonic and cyclic resistance of piles and pile groups in sand
    Correlations for shaft capacity of offshore piles in sand
    Axial load tests on pipe piles in very dense sands at Ras Tanajib

    Piles
    Bearing capacity of driven piles in clay, the NGI approach
    Lateral pile design of the Ursa tension leg platform
    Case study on soil plugging of open-ended steel pipe piles in Tokyo Bay
    Foundation capacity of piled offshore platforms
    Soil characterization for consistent reliability in the Load and Resistance
    Factor Design of pile foundations
    Buckling considerations in pile design
    Propagation of pile tip damage during installation
    One dimensional wave propagation analysis of an open-ended pipe pile with consideration of the excess pore pressure in soil plug
    Simplified analysis of single pile subjected to dynamic active and passive loadings
    Simplified dynamic analysis of pile group subjected to horizontal loading
    Reliability analysis on axially loaded pile foundation of offshore platforms
    Numerical analysis of pile axial loading test on Ryukyu calcareous sediments
    A preliminary investigation into the effect of axial load on piles subjected to lateral soil movement
    Modelling combined loading of piles with local interacting yield surfaces

    Assessing geohazards
    Assessment of the hydrate geohazard
    Gas hydrates and their potential effects on deep water exploration activities
    OpenSees modeling of the 3D plastic behavior of underwater slopes: achievements and limitations
    3DSTAB: a history of 3D stability analysis applied in offshore geotechnics
    A study of ice as an analog of methane hydrate on the basis of static shear strength
    Tackling geohazards – a case study from the Turkmenistan shelf, Caspian Sea


    Site investigation techniques

    Deepwater geotechnical site investigation practice in the Gulf of Guinea
    The origin of near-seafloor “crust zones” in deepwater
    Casing mounted method used for geotechnical drilling in Lavan
    Self/barge Installing Platform, SIP II: the Calder experience
    Assessment of sand quality using seismic techniques at Fisherman Islands, Brisbane
    Site characterization of Bootlegger Cove clay for Port of Anchorage
    The geotechnical diving bell – equipment used in Brazil to perform nearshore and offshore geotechnical investigations
    Conquering new frontiers in underwater cone penetration testing
    Cyclic friction piezocone tests for offshore applications
    Practice notes on push-in penetrometers for offshore geotechnical investigation
    Comparison of cone and T-bar factors in two onshore and one offshore clay sediments
    Considerations in evaluating the remoulded undrained shear strength from full flow penetrometer cycling
    Well deformations at West Azeri, Caspian Sea
    Borehole squeezing in soft clays

    Soil characterization
    Modelling the effects of structure in deep-ocean sediments
    Simulating the mechanical behaviour of some calcareous soils using the Structured Cam  Clay model
    Degradation of cementation for artificially cemented carbonate sands
    Detection of slight cementation in offshore carbonate deposits from laboratory testing
    Experimental study on cyclic pore water pressure and volumetric changes of saturated loose sands under complex stress condition
    Some geotechnical specificities of Gulf of Guinea deepwater sediments
    Mineralogical characteristics of the Gulf of Guinea deep water sediments
    On the compressibility of deepwater sediments of the Gulf of Guinea
    On the classification of Bangkok clay deposits and their compressibility
    Long-term consolidation behavior of Pleistocene clays in Osaka Bay and applicability of elasto-viscoplastic one-dimensional consolidation model
    Influence of salinity on soil properties
    The determination of undrained shear strength and plasticity properties from quasi-static penetration tests
    Influence of height and boundary conditions in simple shear tests

     

    Biography

    Dr Susan Gourvenec is a Lecturer at the Centre for Offshore Foundation Systems (COFS) at the University of Western Australia. Dr Gourvenec joined COFS in 2001, where she works in the area of offshore shallow foundations with particular emphasis on the effect of combined loading. Her current research interests include the bearing and tensile capacity of skirted foundations under general loading and the pull-out capacity of suction caissons under inclined loads using numerical methods and geotechnical centrifuge modelling.

    Dr Mark Cassidy is a Senior Lecturer at the Centre for Offshore Foundation Systems (COFS) at the University of Western Australia. His current research interests include the development of numerical models for shallow foundation behaviour, risk assessment and the optimisation of offshore foundation systems, fluid-structure-soil interaction and geotechnical centrifuge modelling.