ISFOG 2020 Preface and Table of Contents

The Fourth International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2020, hosted by The University of Texas at Austin, follows the success of the previous three symposia hosted by the Norwegian Geotechnical Institute in Oslo, Norway in 2015 and by the Center for Offshore Foundation System at the University of Western Australia in Perth, Australia in 2005 and 2010.

We are very excited about the ISFOG 2020 proceedings. They represent the fantastic passion and energy of the offshore geotechnics community and provide guidance and knowledge that will push the frontiers and advance our profession. We have modernized how the proceedings are issued such that they are available only in electronic format, which improves sustainability and facilitates sharing and data mining.

The classic themes of the previous symposia are still included as they remain relevant to the offshore oil & gas and renewable energy sectors. They include axial and lateral pile responses, foundation installation and extraction, geohazards and integrated studies, in situ and laboratory testing, pipelines, risers, and cables, risk and reliability, shallow foundations, site characterization, soil behavior and modelling, and spudcans. They form the bulk of these proceedings and are addressed in keynote lectures on whole-life design, axial pile capacity in sands, and sediment transports and scour in the ocean environment. Furthermore, in a truly special keynote lecture, Prof. Mark Randolph shares his career reflections and lessons learned through his lifetime of offshore geotechnics.

We also look to the future and realize the emerging and soon-to-be ubiquitous place that data science and machine learning have taken in engineering globally and in offshore geotechnics in particular. This theme is represented for the first time in ISFOG proceedings and is the focus of a keynote lecture on data science applications in geo-intelligence. The lecture summarizes the outcome of a machine learning prediction event where 61 teams applied these techniques to 114 pile driving records.

We also recognize the accelerated pace of the world’s energy transition towards a carbon-neutral environment and the need to transfer and apply the geotechnical skills used to develop traditional oil and gas projects to serve the needs of the offshore wind industry. This theme is well covered in the proceedings with an increased number of papers documenting the performance of offshore wind turbines and is the focus of a keynote lecture which describes how to bridge knowledge between “old and new energy projects.”

In addition, ISFOG 2020 has the privilege of hosting the Fifth McClelland Lecture, which is organized by the International Society of Soil Mechanics and Geotechnical Engineering and its Technical Committee 209 on Offshore Geotechnics. The lecture, to be delivered by Dr. Ed Clukey, focuses on the role of physical modeling in offshore geotechnical engineering.

In total, these proceedings include the 5th McClelland lecture, 6 technical keynotes lectures, and 196 general peer-reviewed papers from 22 different countries. Each paper was reviewed by at least two of the 208 reviewers to whom we are grateful for sparing their time to ensure the continuation of the high standard for which ISFOG has become recognized.

As we write these lines, we should be looking forward to seeing you all in person soon in Austin, Texas for the symposium. Unfortunately, the COVID-19 pandemic has forced us to delay the in-person conference to give us the best chance of having a safe gathering. ISFOG 2020, originally planned for August 16-19, 2020, has now been rescheduled for November 8-11, 2021, at the same venue, the AT&T Conference Center on the campus of The University of Texas at Austin. ISOFG 2020 will take place in 2021. Despite the daunting challenges we faced with the pandemic, we wanted to honor our commitment to the authors of the general papers and keynote lectures that their work would be published in 2020. We therefore have worked determinedly to issue these proceedings so that the papers can be shared and referenced as per the original schedule.

We would like to recognize the leadership, dedication, and enthusiasm of the entire Organizing Committee and highlight the tremendous efforts of Dr. Zack Westgate in his role as Chair of the Technical Program and Editor of these proceedings.

We are grateful for the financial support from our sponsors and the International Society for Soil Mechanics and Geotechnical Engineering, under whose auspices this symposium is held.

We look forward to seeing you in Austin in November 2021!

Bob Gilbert and Philippe Jeanjean
August 2020

Table of Contents

The 5th ISSMGE McClelland Lecture
Dr. Ed Clukey – The Fifth McClelland LecturerPhil Watson1
The Role of Physical Modeling in Offshore Geotechnical EngineeringDr. Edward C. Clukey5
A Lifetime of Offshore Geotechnics – Career Reflections and Lessons Learned
Mark F. Randolph
Bridging Knowledge between Old and New Energy ProjectsGülin Yetginer and Tor Inge Tjelta84
Data Science Applications in Geo-IntelligenceB. Stuyts120
Improving the Reliability of the Calculated Axial Capacity of Piles in SandFarrokh Nadim, Suzanne Lacasse, Zhongqiang Liu and Barry Lehane150
Sediment Transport and Scour in the Ocean Environment – Knowledge and Future DirectionsRichard J. S. Whitehouse and Scott Draper178
Whole-Life Geotechnical Design: What Is It? What’s It For? So What? And What Next?Susan Gourvenec, Professor206
Anchoring Systems
A Self-Contained, Dynamically Embedded Plate Anchor: Installation and CapacityYing Lai, Hande Gerkus-Harris, Robert B. Gilbert, Jose Eugenio Iturriaga Flores, Asitha I. Senanayake, Yunhan Huang, Aaron S. Bradshaw and Joe R. Giampa247
Anchoring SyA Time-Domain Model for Embedded and On-Bottom Chains Incorporating Consolidation
Yih Shan Yap, Conleth D. O’Loughlin and Joe G. Tom256
Analysis and Design of Suction Anchors Allowing for TrenchMark F. Randolph, James P. Doherty, Michael P. O’Neill, Xiaowei Feng, Jean-Christophe Ballard and Camilo Melo269
Assessment of Suction Caisson Drained Tensile Capacity through Multiscale Physical TestsTulio Quiroz and Aligi Foglia280
CFD Analysis of an Observed Mooring Line Trench to Assess the Potential for Further Trench DevelopmentKhalida Sassi, Gerard Fernandez, Joe Tom, Scott Draper and Ming Zhao290
Cyclic Capacity of Plate Anchors in Loose SandShiao Huey Chow, Andrea Diambra, Anamitra Roy, Conleth D. O’Loughlin and Christophe Gaudin303
Cyclic Loading of Helical Pile as Anchor for Floating Windturbines: Centrifuge TestsLuc Thorel, Ismat El Haffar, Semaan Maatouk, Jose Antonio Schiavon and Cristina Tsuha313
Cyclic Loading of Offshore Wind Turbine Suction Bucket Foundations in Sand: The Importance of Loading FrequencyHan Eng Low, Fangyuan Zhu, Henning Mohr, Carl Erbrich, Philip Watson, Fraser Bransby, Conleth O’Loughlin, Mark Randolph, Mohamed Mekkawy, Thaleia Travasarou and Daniel O’Connell321
Effect of Fin Shape on the Penetration and Pullout of Torpedo Anchors in Marine ClaysAbdelazis Ads, Mehdi Omidvar, Stephan Bless and Magued Iskander332
Frequency Scaling of Physical Model Tests on Tensile Loaded Suction Buckets by Finite Element AnalysisPatrick Gütz and Martin Achmus342
Holding Capacity of Suction Anchors with Trench – Centrifuge Test Results and InterpretationDavid Cathie, Khalida Sassi, Matthieu Blanc, Luc Thorel and Regis Wallerand352
Horizontal Load Capacity of Multiline Ring Anchor in Soft ClayCharles Aubeny and Junho Lee362
Long Term Cyclic Stability of Shallow Helical Anchors in a Hydraulically Placed SandJ. T. Newgard, J. A. Schneider, J. S. McCartney and D. J. Thompson372
Macro-Element Modelling of Plate Anchor Kinematics under Cyclic Loading in ClayAnderson Peccin da Silva, Dr. Andrea Diambra, Dr. Dimitris Karamitros and Dr. Shiaohuey Chow382
Numerical Study for Liquefaction Response of Taut and TLP Mooring Anchors during EarthquakesPourya Kazemi Esfeh, Laura Govoni and Amir M. Kaynia392
Optimisation of Screw Anchor Lateral Capacity in Sand for Offshore Renewable Energy ApplicationsB. Cerfontaine, M. J. Brown, J. A. Knappett, C. Davidson and Y. Sharif402
Optimising Anchor Design to Achieve Greater Embedment Depth and Holding CapacityYinghui Tian, Mark J. Cassidy and Mark F. Randolph412
Soil Failure Mechanism and Capacity of Stiffened Caisson Anchors in Calcareous SiltMohammad A. Mohiuddin, Muhammad S. Hossain, Shah N. Ullah, Youngho Kim and Yuxia Hu422
Suction Caisson Response under Tensile and Compressional Vertical Cyclic Loading in Layered SoilsMarc Stapelfeldt, Britta Bienen and Jürgen Grabe432
Tangential Shear Behavior between Sand and Anchor ChainShengjie Rui, Zhen Guo, Lizhong Wang, Wenjie Zhou and Kanmin Shen442
Three Dimensional Numerical Modelling of Embedded Mooring LinesYinghui Tian, Wenlong Liu and Mark J. Cassidy452
Axial Pile Response
A New ‘Unified’ CPT-Based Axial Pile Capacity Design Method for Driven Piles in SandBarry Lehane, Zhongqiang Liu, Eduardo Bittar, Farrokh Nadim, Suzanne Lacasse, Richard Jardine, Pasquale Carotenuto, Mike Rattley, Philippe Jeanjean, Kenneth Gavin, Robert Gilbert, Jens Bergan-Haavik and Neil Morgan462
A Simple Method to Evaluate the Natural Frequency of Jacket Supported Offshore Wind Turbine under StormWenjie Zhou, Zhen Guo, Lizhong Wang, Shengjie Rui, Jiahao Li, Yujie Li and Chencong Liao478
Axial Capacity Evaluation of Open-Ended Pipe Piles in Medium Dense Silty Sand Using Soil Plugging Length RatioOsama Safaqah, Subba R. Gudavalli and Spencer S. Jeon489
Axial Capacity of Large-Scale Piles in Micaceous SoilsJan Dührkop, Luís Berenguer Todo Bom, Ph.D. and Barry Lehane500
Computation of Interaction Diagrams for Cyclic Axial Loads in Offshore Piles Based on an
Effective Stress Method
Jose G. Parra and Mariajose Guevara510
CPT Filter to Estimate the End Bearing of Closed-Ended Driven Piles in Layered SandsEduardo Bittar, Barry Lehane, Ross W. Boulanger and Jason T. DeJong520
Cyclic Axial Load Testing of Pipe Piles in SandTimothy E. Keefe, Ahmed M. Hussien, Aaron S. Bradshaw, Andrew D. Deeks, James A. Schneider, Amir Rahim, Farnyuh Menq and Robert Gilbert529
Effects of Cyclic History on the Ageing of Shaft Friction of Driven Piles in SandEduardo Bittar, Barry Lehane, Phil Watson and Andrew Deeks541
Evaluation of API and CPT Axial Pile Capacity Methods of Campeche Bay Soils for the Design of Offshore PilesIvan Zarate, Francisco A. Flores, President and Diego Cruz551
Examination of Open-Ended Pile Capacity Methods in Estimating Axial ResponseTrevon M. Joseph and Guy T. Houlsby563
Impact of the Installation on the Long-Term Behaviour of Offshore Wind Turbine Pile FoundationsP. Staubach, J. Machacek and T. Wichtmann573
Numerical Analysis of Offshore Wind Turbine Foundations in Dense Sand Considering Partial DrainageS. Whyte, M. Rattley, M. Ramos Da Silva, C. M. Martin, H. J. Burd and C. Erbrich583
Pile Behavior in Low-Medium Density Chalk: Preliminary Results from the ALPACA ProjectRóisín M. Buckley, Richard J. Jardine, Byron W. Byrne, Stavroula Kontoe, Ross A. McAdam, Reza Ahmadi-Naghadeh, Tingfa Liu, Fabian Schranz and Ken Vinck594
Review of the Design of Driven Piles Penetrating Weak Rock for Offshore ApplicationsJohn Barrett, P.E. and Luke J. Prendergast, Ph.D.604
Structural Monitoring of the Keystone “Twisted Jacket” Foundation: A Case Study off the Hornsea CoastP. Doherty and B. Casey614
The Axial Performance of Jetted Conductors in Carbonate SedimentAlex Osuchowski, Phil Watson, Conleth O’Loughlin, Yuxia Hu, Rose Zhang, Meysam Banimahd, Ben Holland and Matthew Kuo624
The Field Behaviour of Drilled and Grouted Piles in Rock for Offshore FoundationsJamie Klapper, Sebastien Manceau, Alexander Hall, Richard Jardine and Pedro Barbosa Moreira634
Torsion at Pile to Pile Sleeve Grout Connection and Proposed Design Procedure of Shear KeysTewodros H. Tefera644
Data Science
A Machine Learning Based Quantitative Integration of Geotechnical and Geophysical Data for Deepwater Site CharacterizationJinbo Chen, Liqin Sang, Bryce Willems, Jason Newlin, Øyvind Ruden, Ritu Sarker and Shuang Hu653
Analyzing the Driving Performance of Pile Foundations Using Data Driven ModelsJames P. Doherty, Mark F. Randolph and James A. Schneider664
Comparison of Machine Learning Models in a Data-Driven Approach for Scalable and Adaptive Design of Laterally-Loaded Monopile FoundationsS. K. Suryasentana, H. J. Burd, B. W. Byrne, A. Aghakouchak and T. Sørensen674
Data Driven Assessment of Offshore Wind Turbine Foundation StiffnessRoss A. McAdam, Anela Bajric, Manolis N. Chatzis, Byron W. Byrne and Cedric Vanden Haute684
Predictive Analytics Application in Developing Regional Suitability Mapping (RSM)Christian H. Girsang, Muhammad J. Rohani, Noorizal N. Huang, Norhayati Yusoff and Azam A. Rahman694
Foundation Installation and Extraction
An Assessment of the Accuracy of SRD Methodologies for OWF Monopile Installation against a North Europe Driving Records DatabaseGeorgios Perikleous, Themis Stergiou and Sandra Meissl704
Effects of Vibratory Driving of Monopiles on Soil Conditions and Their Cyclic Lateral Load
Bearing Behavior
Bastian Hoffmann, Johannes Labenski and Christian Moormann714
Experience from Full-Scale Suction Caisson Trial Installations at the Seagreen Offshore Wind FarmLewis Jones and Andrew Harding725
GDP: A New Technology for Gentle Driving of (Mono)PilesAndrei V. Metrikine, Apostolos Tsouvalas, Maxim L. A. Segeren, Ahmed S. K. Elkadi, Faraz S. Tehrani, Sergio S. Gómez, Rob Atkinson, Federico Pisanò, Evangelos Kementzetzidis, Athanasios Tsetas, Timo Molenkamp, Kees van Beek and Peter de Vries736
Hydraulic Pile Extraction Scale Tests (HyPE-ST): Experimental Design & Preliminary ResultsT. Balder, D. A. de Lange, A. S. K. Elkadi, P. J. P. Egberts, W. J. A. P. Beuckelaers, M. Coronel, J. van Dijk, R. Atkinson and H. J. Luger746
Insights into the Driveability of Large Diameter PilesDavid Cathie, Christophe Jaeck, Erdem Ozsu and Sylvie Raymackers757
Large Diameter Monopile Buckling Due to Localized Force – A Numerical StudyEmilio Nicolini, Aram Cornaggia and Anna Pandolfi767
Numerical Simulation of the Installation of Suction Buckets Using MPMM. Martinelli, E. A. Alderlieste, V. Galavi and H. J. Luger777
Physical Modelling of Pile Tip Damage Arising from Impact DrivingJuliano A. Nietiedt, Mark F. Randolph, Christophe Gaudin, James Doherty, Dan Kallehave, Jens Gengenbach and Avi Shonberg787
Pile Design, Installation and Back-Analysis of 54 in Piles in Gravels at the Wiriagar Deep Platform in Berau Bay, IndonesiaHugo Galanes-Alvarez, Achmad Makmur, Philippe Jeanjean and Chee Peng Pua798
Pile Driving Instrumentation of 54-Inch Piles in Gravels at the Wiriagar Deep Platform in
Berau Bay, Indonesia
Chee Peng Pua, D. S. Murthy, Radha Rao, Hugo Galanes-Alvarez, P. Jeanjean and Achmad Makmur808
Plug Heave Phenomena during Pile InstallationDirk Luger and René Thijssen818
Suction Bucket Installation: Risks during the Installation ProcessAvi Shonberg, Michael Harte, Amin Aghakouchak and Morten Albjerg Liingaard828
Suction Installation of Modular Bucket Foundation for Large Offshore Wind TurbinesAleksandra K. Koteras, Francisco M. G. Rodriguez and Lars B. Ibsen838
The Impact of Installation Method on Monotonic Loading of Monopiles in SandK. G. Gavin, S. D. Blok and G. R. Eiksund, Professor849
The Influence of Friction Fatigue on Pile Drivability Predictions for Large Diameter Monopiles in the Bolders Bank FormationS. R. Davies, G. Giuliani and M. Vaziri858
Vibratory Driving of a Monopile at a North Sea SiteA. Holeyman, V. Whenham, P. Peralta, J.-C. Ballard and S. Chenicheri Pulukul868
Geohazards and Integrated Studies
A Combined Analysis Procedure for Submarine Landslide EvolutionAndreas Stoecklin and Alexander M. Puzrin878
Centrifuge Study of Seismic Response of Submarine Clay CanyonsSamuel F. M. Tarazona, Maria C. F. Almeida, Márcio S. S. Almeida, Sandra Escoffier and Lucas C. Takayassu887
Computational Modelling of Unburied Offshore Pipelines Crossing Active Tectonic FaultsAikaterini Triantafyllaki, Ph.D. Candidate, Panos Papanastasiou, Professor and Dimitrios Loukidis, Associate Professor897
Design Focused Ground Models for Offshore Rock-Socketed Pile Solutions: St Brieuc OWF – A Case StudyJordan Geear, Clement Tam, Andrew Hart, Agustin Bertossa, Indrasenan Thusyanthan and Julien Pitel907
Integrated Ground Modelling from a Geotechnical PerspectiveRasmus T. Klinkvort, Guillaume Sauvin, Carl Fredrik Forsberg and Maarten Vanneste917
Maximum Depth of Liquefaction Based on Fully-Coupled Time Domain Site Response AnalysisJulia Katharina Möller, Stavroula Kontoe, David Taborda and David Potts927
Numerical Assessment of Gas Hydrate Dissociation on Submarine Slope StabilityXiaoyan Long, Sudarshan Adhikari, Alan Witthoeft and Ko Min Tjok937
Probabilistic Landslide Susceptibility Offshore South West Iberian MarginStefano Collico, Marcos Arroyo, Roger Urgeles, Eulalia Gràcia, Marcelo De Vincenzi and Norma Peréz947
Resonance as the Source of High Vertical Accelerations: Field Demonstration and Impact on Offshore Wind TurbinesVasiliki Tsaparli, Stavroula Kontoe, David M. G. Taborda and David M. Potts957
Scour Potential Evaluation of the Western Irish Sea Mud Belt (Scope)P. Doherty, M. Coughlan and S. Creane969
Site Characterisation of a Submarine Volcanic Terrain: The Importance of Data IntegrationOsama Safaqah, Xuan Nhan Pham, Quang Chung Dam, Chris A. Smith, Lorraine O’Leary, Chris Steven and Jason Goh986
Surficial Crust Effects on Mass Gravity Flow Induced Seafloor Scour CharacteristicsAurelian C. Trandafir996
In situ and Laboratory Testing
A Novel in-situ Test Setup for Measuring the Interface Resistance between Pipelines and Underlying SoilsRoba Houhou, Rayan Bou Mjahed, Elie Shammas, Shadi Najjar and Salah Sadek1006
Challenges of Mica Content DeterminationsKee Kiat Tho, Nancy Chan, Anders H. Augustesen, Edward Molyneaux, Lone Krogh and An-Bin
CPT Data Showing Anomalies – Assessment and Potential Post-ProcessingJ. Peuchen, R. Santos, G. Yetginer, W. S. Eckart, T. Carrington and T. Lunne1026
Depth Accuracy of Data Points in Marine Soil InvestigationJoek Peuchen and Rik Wemmenhove1036
Development of New Robust Procedures for the Determination of Maximum and Minimum Dry Densities of SandSiren Knudsen, John J. M. Powell, Tom Lunne, Nanna V. Thomsen, Lone Krogh and Andy Barwise1046
Effect of Cyclic Load Sequence on the Accumulation of Deformations and Post Cyclic Strength of Sand-Structure InterfacesKyle B. O’Hara, M.S., S.M. ASCE and Alejandro Martinez, Ph.D., A.M. ASCE1056
Effect of Cyclic Preshear on Strength and Stiffness Properties of Sand in Drained Triaxial TestingAmin Rismanchian, Anders H. Augustesen, Lone Krogh, Tim Carrington and Nanna V. Thomsen1066
Experience with Testing Box Core Samples of Soft Clays Using Miniature Full-Flow PenetrometersAdriane G. Boscardin, Don J. DeGroot and Tom Lunne1076
Field Testing for Monopile to Be Installed in Weak Carbonated RockE. Palix and A. Lovera1086
Free Fall Penetrometer Deployment Strategies and the Impact on Data Analysis: Pilot Weight Trigger versus Winch-DeployedNina Stark, Nico Parasie and Joek Peuchen1096
Indirect Measurement of Soils in-situ Horizontal Stress from Matric Suction Measurements: Developing a New TensiometerAmin Rismanchian, Tim Carrington, Karl Snelling and Jerry Sutton1106
Interpretation of Piezocone Test in Overconsolidated Clays Using SHANSEPMarco D’Ignazio, Knut H. Andersen, Harun Kürsat Engin, Sivasithamparam Nallathamby, Hans Petter Jostad and Gülin Yetginer1116
Laboratory Testing of Soil-Structure Interaction on Rock Dump CarpetsBrian Sheil, Thomas Andolfsson, Byron Byrne and Alasdair Maconochie1126
On the Triaxial Testing of Sand for Offshore Wind Turbine Foundation DesignLewis Jones, Jonathan White and Truong Le1137
Portable Free Fall Penetrometer Measurements: Shear Resistance versus Drag ResistanceNina Stark, Dennis Kiptoo, Nick Brilli and Reem Jaber1149
Predictions of Multi-Amplitude Laboratory Tests Using Hyperplasticity ModelsT. D. Balaam, B. W. Byrne, G. T. Houlsby, H. P. Jostad and A. M. Page1159
Repeatability of G/sub max/ Bender Element Measurements on Triaxial and Resonant Column Sand SpecimensPasquale Carotenuto, Yusuke Suzuki, Rune Dyvik, Anders H. Augustesen and Lone Krogh1170
Rigidity Index of Soft Remolded Clays during Thixotropic HardeningJing Peng, Don J. DeGroot, Yiming Cao and Guoping Zhang1180
Role of Rheology Testing in Submarine Debris Flow SimulationArash Zakeri and Benoit Spinewine1190
Thixotropy of Clays with Various Index PropertiesShaoli Yang, Yubin Ren, Knut H. Andersen, Ying Wang, Graziella M. F. Jannuzzi and Rhamira D. G. Pascual1200
Towards a Combined Use of Chirp Sonar and Portable Free Fall Penetrometer: Case Study Potomac RiverReem Jaber, Dennis Kiptoo, Nina Stark, Navid Jafari and Nadarajah Ravichandran1211
Lateral Pile Response
3D Finite Element Analysis of Monopiles and Its Application in Offshore Wind Farm DesignAngeliki Grammatikopoulou, Felix C. Schroeder, Giuseppe Pedone, Amandine Brosse, Torben Sørensen, David M. G. Taborda and David M. Potts1221
3D Finite Element Modelling of Monopiles in Sand Validated against Large Scale Field TestsDavid J. P. Igoe and Soroosh Jalilvand1231
A Consistent, Rigorous and Super-Fast Monopile Design ApproachRasmus T. Klinkvort, Hendrik Sturm, Ana M. Page, Youhu Zhang and Hans Petter Jostad1243
A Design Framework for Monopiles in Sand Based on Large-Scale Pile Load Tests and FE AnalysisKatja Siegl, Jan Dührkop and Severin Spill1253
A Generalised Winkler Model for the Hysteretic and Ratcheting Behaviour of Monopiles in Clay and SandWilliam J. A. P. Beuckelaers, Harvey J. Burd, Guy T. Houlsby, Ross A. McAdam and Byron W. Byrne1263
An Investigation of the Contribution of the Pile Base to the Lateral Response of Monopiles in Sand under Static LoadingH. Wang, B. M. Lehane, M. F. Bransby, L. Z. Wang and Y. Hong1273
Application of Second-Order Cone Programming Finite Element Methods for Laterally Loaded Monopiles in Offshore WindD. Abadias, K. Krabbenhoft and J. Krabbenhoft1282
Comparison of Predicted Pile Load-Displacement Response Using PISA and API p-y to Static Laterally Loaded Onshore Test Piles in Sand at CuxhavenPeter Duroska, Vasilis Avgerinos, Miguel Pacheco Andrade, Kris W. Andersen and Morten Albjerg Liingaard1292
Comparison of p-y Methods with Large-Scale Tests of Impact- and Vibratory-Driven PilesSeverin Spill, Aligi Foglia and Jan Dührkop1302
Concept Design Study of Laterally Loaded Monopiles in SandStavros Panagoulias, Axel Nernheim, Diego Lisi, Miquel Lahoz and Ronald B. J. Brinkgreve1312
Cyclic Laterally Loaded Medium Scale Field Pile Testing for the PISA ProjectByron W. Byrne, Ross A. McAdam, William J. A. P. Beuckelaers, Harvey J. Burd, Ken Gavin, Guy T. Houlsby, David J. P. Igoe, Richard J. Jardine, Chris M. Martin, David M. Potts, David M. G. Taborda and Lidija Zdravković1323
Degrading P-Y Spring Model for Laterally Loaded Piles in Soft ClayAhmed Q. O. Al-Ramthan, Charles P. Aubeny and Olusola Komolafe1333
Design of Laterally Loaded Monopiles for Offshore Wind Using Small-Strain Properties of SandsYunhan Huang, Robert Gilbert, Kenneth Stokoe, Shin-Tower Wang, James Munson, Jonas Bauer, Reihaneh Hosseini, Ahmed Hussien and Hossein Fadaifard1343
Design of Monopiles in the North Sea with the New PISA Springs, a Sensitivity StudyGuillaume Melin, Martin U. Østergaard, Søren P. H. Sørensen and Evelina Vaitkune1353
Effect of Interface Conditions on the Response of Laterally-Loaded Monopiles in SandLidija Zdravković, David M. G. Taborda and David M. Potts1364
Episodes of Cycling and Reconsolidation Effects on Cyclic Lateral Behavior of Monopiles in Soft Clay: Centrifuge ModelingY. Q. Lai, L. Z. Wang, Y. Hong, B. He and H. Wang1374
Extension of the p-y Curves Framework for Cyclic Loading of Offshore Wind Turbines Monopiles in Soft RockA. Lovera, S. Ghabezloo, J. Sulem, M. F. Randolph and E. Palix1383
Key Features Impacting Soil-Conductor Lateral Behaviour as Illustrated by Centrifuge TestsMariajose Guevara, James Doherty, Phillip Watson and David White1393
Large Diameter Pile Testing for Offshore Wind Applications with a Focus on Cyclic Lateral Loading and Rate EffectsRóisín M. Buckley, Byron W. Byrne, Sarah C. Martin, Ross A. McAdam, Brian B. Sheil, Amin Aghakouchak and René Lindeboom1403
Lateral Behavior of a Pile Due to Eccentric Horizontal LoadsJian Yu, Maosong Huang, Kanmin Shen and Chenrong Zhang1413
Lateral Behaviour and Failure Mechanism of Stiff Monopile in ClayB. He, Y. Q. Lai, S. X. Zhao, W. Li, J. P. Luo and Z. Q. Jiang1421
Lateral Pile Group Effect: Literature Review and a Numerical StudyY. N. Teng, Y. H. Zhang and Y. Q. Lai1433
Long Term Deformation of Cyclic Loaded Monopiles in SandChenrong Zhang, Feng Yu, Zhiqi Zhu and Maosong Huang1444
Methods of Numerical Analysis of Monopiles under Pseudo-Random Lateral LoadingGuy T. Houlsby, Byron W. Byrne, Harvey J. Burd and Toby D. Balaam1454
Modal Analysis of OWTs in Sand – Comparison between Measured and Predicted ValuesKris W. Andersen, Peter Duroska, Cameron Brown, Miguel Pacheco Andrade and Michael Harte1465
Modelling of Offshore Wind Monopile Lifetime PerformanceChristelle N. Abadie, Byron W. Byrne, Guy T. Houlsby, Harvey J. Burd, Ross A. McAdam and William J. A. P. Beuckelaers1475
Modelling the Response of Monopiles to Complex Cyclic Lateral Loading in SandIona A. Richards, Guy T. Houlsby and Byron W. Byrne1485
Monopile Lateral Response Calibration from in-situ Monitoring DataB. Stuyts, W. Weijtjens, C. Devriendt, H. Versteele and C. Vanden Haute1495
Natural Frequencies Estimation of a Monopile Supported DTU-10MW Offshore Wind TurbinePhilip Alkhoury, Abdul-Hamid Soubra, Valentine Rey and Mourad Aït-Ahmad1505
Nearshore Large Diameter Lateral Pile Load Test in Medium Dense to Dense SandMathieu Guinard, David P. Waring, Subra Padmanabhan and Marisa S. Soares1516
PICASO: Cyclic Lateral Loading of Offshore Wind Turbine MonopilesByron W. Byrne, Amin Aghakouchak, Róisín M. Buckley, Harvey J. Burd, Jens Gengenbach, Guy T. Houlsby, Ross A. McAdam, Christopher M. Martin, Fabian Schranz, Brian B. Sheil and Stephen K. Suryasentana1526
Scour Protection Effects on Laterally Loaded MonopilesRussell O. Mayall, Harvey J. Burd, Byron W. Byrne, Ross A. McAdam, Richard J. S. Whitehouse, Phillipa L. Slater and Steven G. Heald1536
Study on p-y Curve for Monopile under Cyclic Lateral Load in Soft ClayYuan Zhou, Jingbin Zheng, Dong Wang and Hailei Kou1546
The Macro-Element Method for Offshore Wind Turbines Exposed to Extreme Loads in the Asia-Pacific RegionSara C. van Hoogstraten, Sebastiaan J. Hermans, Willem G. Versteijlen, Ana M. Page, Gustav Grimstad, Federico Pisanò and Andrei V. Metrikine1556
The Use of Numerical Analysis to Aid the Design of Monopile Foundations for a North Sea Offshore Wind FarmFelix C. Schroeder, Angeliki Grammatikopoulou, Andy Barwise, Stephen MacKinnon, Richard J. Jardine and David M. Potts1566
Ultimate Capacity of Short Piles in Clay under Lateral LoadingChris M. Martin, Harvey J. Burd, Ross A. McAdam, Peter J. Houlston and Isabel von Celsing1576
Pipelines, Risers, and Cables
A Review of Drag Anchor Penetration Models to Inform Cable Burial Risk AssessmentGiuliano Pretti, William M. Coombs, Charles Augarde, Marc M. Puigvert, José A. R. Gutiérrez and Laurence Cross1586
Axial Soil Stiffness for Deepwater Pipeline Walking AnalysisJinbo Chen, David White, Chris Hadley, Kevin Ouyang, Jason Newlin, Shuang Hu, David Bruton and Meng Luo1596
Case Study: Rosetta Channel Pipeline CrossingDavid Kay, David Rushton, Frans Van Herpen, Aad Van Es, Sanjay Shinde, Martyn Chapman and Stelios Panayides1606
Constructional and Operational Considerations in Assessing the Lateral Response of Buried Subsea PipelinesHodjat Shiri and Morteza Kianian1616
Drained Residual Conditions for Axially Loaded FlowlinesAhmed M. Hussien, R. B. Gilbert, Y. Huang, C. Sung, J. Han, L. Melo Monteiro, J. Chen, K. Ouyang and M. Luo1626
Effect of Water Entrainment on Seabed Soils during Cyclic Pipe-Soil InteractionF. Sahdi, J. G. Tom, P. Watson, C. Gaudin and M. F. Bransby1636
Field Observations of Pipelines in the Context of SAFEBUCK Design GuidelinesDaniel R. Spikula, David Kay, Zack Westgate and Andy Hill1646
Inclined and Uplift Resistance of Pipelines Buried in RockConleth D. O’Loughlin, David J. White, Alasdair J. Maconochie and G. J. Yun1657
Large Deformation Analysis of Lateral Pipeline-Backfill-Trench Interaction by Remeshing and Interpolation Technique with Small Strain Model (RITSS)Xiaoyu Dong, Hodjat Shiri, Wangcheng Zhang and Mark F. Randolph1668
On the Behaviour of Pipe-Clamping Mattresses to Arrest Pipeline WalkingColm O’Beirne, Conleth O’Loughlin, Phil Watson, David White, Sze-Yu Ang and Sebastiaan Frankenmolen1678
Pipe-Soil Interaction for Surface-Laid Pipelines in Carbonate SedimentsFraser Bransby, Han Eng Low, Fangyuan Zhu, Romain Clavaud and David White1690
Sensitivity of Fatigue Service Life of Steel Catenary Risers Using Nonlinear Riser-Soil-Interaction Model to Duration of Dynamic Simulation under Randomly Generated WavesAtmaram Muraleedharan and Mehrdad Kimiaei1705
Shearing Resistance of Rough Polymer-Sand InterfacesHenry Milewski, Andrea Diambra, Lawrence W. de Leeuw and Matthew S. Dietz1716
Subsea Pipeline Walking: The Effect of a Bi-Linear Seabed Friction ModelIndranil Guha, Ph.D. Candidate, David J. White, Professor and Mark F. Randolph, Professor1726
The Geometrical Significance of Seabed Trench in Fatigue Performance of Steel Catenary Risers in the Touchdown ZoneHodjat Shiri and Rahim Shoghi1736
Using Coating Roughness to Control Pipe-Soil Friction and Influence Pipeline Global Buckling BehaviourLawrence W. de Leeuw, Andrea Diambra, Matthew S. Dietz, Henry Milewski, George Mylonakis, Oh-Sung Kwon and Anastasios G. Sextos1746
Risk and Reliability
Effect of Sea State Realizations on the Geotechnical Design of OWT FoundationsEffect of Sea State Realizations on the Geotechnical Design of OWT Foundations1756
Probabilistic Site Response Analysis: Methodology and ApplicabilityDaniela Tonoli, Francesca Ioele, Pamela Poggi, Daniele Bertalot, Omar Zanoli, Eric J. Parker and Emilia Fiorini1764
Reliability of Five Axial Pile Capacity Design Methods – A Case StudyZhongqiang Liu, Sarah Elkhatib, Farrokh Nadim and Suzanne Lacasse1774
Slope Failures: Quantifying Frequencies and Volumes and Identifying a Potential Trigger MechanismEric Liedtke and Daniel R. Spikula1785
The Statistics of Monopile Foundation Capacity in Spatially Variable Soil: Is Prediction of Axial Capacity Based on a Single CPT Reliable?Y. Cai, M. F. Bransby and C. Gaudin1795
Shallow Foundations
Design of Shallow Foundations for Tidal-Stream Energy StructuresJohn Barrett, P.E., Kenneth Gavin, Ph.D., C.Eng. and Tom Doyle, Ph.D.1805
Pin Foundation on Hard SeabedEmilio Nicolini, F. Dedecker and R. Coquet1816
Simple Method for Computing Nonlinear Foundation Stiffness and DampingJörgen Johansson, Nallathamby Sivasithamparam, Youhu Zhang and Harun Kursat Engin1824
Skirt Penetration Resistance of the Utgard TemplateKnut H. Andersen, Knut Schrøder, Viggo Karlsen and Egil Solhjell1834
Sliding Mudmats Design – Current State of Practice and Realistic 3D SimulationsJean M. Audibert, M. Kabir Hossain, SUT, ASCE and John T. Bryant ASCE, AIPG, PTI, ACEC1844
The Effect of Shape on the Failure Envelope of the Cross-Shaped Foundation – Numerical AnalysesEmilio Nicolini, A. Alberio and G. Della Vecchia1855
Site Characterization
An Assessment of the Overconsolidation and Post-Sedimentation Structure of Marine Clay from Offshore Northern MozambiqueLogan C. Brant and Rodolfo B. Sancio1863
Analytical Effective Stress Piezocone Methods for Assessing Geoparameters of Offshore ClayPaul W. Mayne, Shehab S. Agaiby and Zhongkun Ouyang1872
Application of Probabilistic Calibration of Geostatistical Parameters in Seismic Travel Time InversionMoslem Moradi and Zenon Medina-Cetina1882
Characteristic Values for Geotechnical Design of Offshore Monopiles in Sandy Soils – Case StudyJ. Peuchen, K. Kaltekis, M. Klein, M. Murali, F. C. W. van Erp and M. A. Hicks1892
CPT Correlations for Estimating Undrained Shear Strength of Marine Clay Offshore East AfricaAli Ebrahimi and Rodolfo B. Sancio1902
Cyclic Response of an East African Marine ClayRodolfo B. Sancio and Logan C. Brant1912
Dynamic Gassy Soils Behaviour, Gulf of MexicoRaúl Nava-Castro and Kuat C. Gan1922
Engineering Properties of Late Pleistocene and Holocene Sediments of the Continental Shelf Offshore TrinidadDaniel R. Spikula and Eric Liedtke1932
Geotechnical Challenges for Offshore Windfarm Foundation Design in Emerging Asian MarketArthur K. C. Cheung, Aslan S. Hokmabadi, Honest P. O. Tang and Jack Yiu1942
Geotechnical Characterization of Mississippi River Delta Front SedimentsJack A. Cadigan, Navid H. Jafari, Ioannis Y. Georgiou, Samuel J. Bentley, Kehui Xu and Michael D. Miner1952
Implementation of Advanced Monopile Design Approaches at the Seastar Offshore Wind FarmM. Rattley, S. Whyte, J. Hilton, D. Burbury, H. J. Burd, C. M. Martin and S. Ingarfield1962
Nonlinear Constitutive Model of Stress-Strain Behavior for Bay of Campeche SandFrancisco A. Flores López, Ernesto Vega Fernández, Victor M. Taboada, Diego Cruz Roque and Prócoro Barrera Nabor1974
On the Cyclic Resistance of Dense North Sea SandsD. Bertalot, D. Soler Sandoval and G. Yetginer Tjelta1984
Overview of Geological and Geotechnical Characteristics of Offshore Sout China Sea SedimentsHuo Ping Wang, Her Jia E. Hu, Xiaoyan Long, Nancy Chan and Ko Min Tjok1994
Probabilistic Slope Stability Analysis Using Novel Response SurfaceAleksander S. Gundersen, D. Ryghseter, A. Worren, F. Nadim and Z. Liu2005
Soil Behavior and Modeling
3D Finite Element Modelling of the Cyclic Behaviour of Large Diameter Monopiles in SandChris Humpheson, Helen Dingle and Anton Pillai2013
An Efficient FEA Tool for Offshore Wind Turbine FoundationsNallathamby Sivasithamparam and Hans Petter Jostad2023
Auto-Calibrated Kinematic Hardening Clay Model with Application to Monopile Foundations for Offshore Wind TurbinesKristian Krabbenhøft, Jørgen Krabbenhøft and Morten Andersen Herfelt2033
Comparison of Two Mesh Regularization Approaches for Large Deformation Finite Element AnalysisJin Chen and Bipul Hawlader2043
Earthquake Loads on Suction Anchors and Piles for Subsea FacilitiesAmir A. Rahim and Amir M. Kaynia2053
Insight into the Cyclic Response of OWT Pile Foundations in Sand: Numerical Simulation of PISA Field TestsPanagiota Tasiopoulou, Jacob Chacko, Yannis Chaloulos, Amalia Giannakou and Nikos Gerolymos2062
Investigating the Response of Tripod Suction Bucket Foundations to Multidirectional Lateral Cyclic LoadingA. Barari and L. B. Ibsen2073
Investigation of Rate Effects for Monopile Foundations: Laboratory-Scale Model TestsKuen-Wei Wu, Byron W. Byrne and Guy T. Houlsby2085
Modelling the Effects of Cyclically-Induced Consolidation on Spudcan CapacityRaffaele Ragni, Joe Tom, Britta Bienen and David Mašín2095
Offshore Clays – Parameter Calibration of a New Hybrid Hyperbolic ModelLorenzo Zuccarino, Luca Ottonello and Omar Zanoli2105
Post Cyclic Volumetric Recompression Response of Carbonate SedimentsShambhu S. Sharma, Hackmet Joer and Noel Boylan2117
Practical Approach for the Evaluation of Cyclically Induced Excess Pore Pressure around Offshore Foundations in SandJann-Eike Saathoff and Martin Achmus2127
Seismic Response of Offshore Wind Monopiles in Cohesionless SoilsJ. Seong, C. N. Abadie, S. K. Haigh and S. P. G. Madabhushi2137
Strain Accumulation in Granular Soils under Cyclic Multiaxial Stress ConditionsXiaoyang Cheng, Feng Yu, Maosong Huang, Erdin Ibraim and Andrea Diambra2147
Strength Properties of Subsea Rockfills at Low Stress LevelHongjie Zhou, Andrew D. Deeks, Amir M. Kaynia, Alasdair Maconochie and Wouter Op den Velde2157
Case Study: Spudcan-Pipeline Interaction at the Maria Field – Challenges of Data Interpretation and Comparison of Predicted and Measured Soil DeformationKhoa D. V. Huynh, Vaughan M. Meyer and Richard J. Pike2168
Comparison of Penetration Mechanisms of Cone and Spudcan in a Multilayer Deposit with Interbedded Sand LayersStefanus Safinus, M. S. Hossain, M. J. Cassidy, M. F. Randolph and M. A. Mohiuddin2178
Earthquake Soil-Structure Interaction Assessments of Jack-Up MODU for Tangguh Development, Offshore Papua Barat, Indonesia – Part 1Hugo Galanes-Alvarez, Armedito Ramadhan, Philippe Jeanjean, Kevin M. Hampson, Carl Erbrich and Kok Kuen Lee2188
Earthquake Soil-Structure Interaction Assessments of Jack-Up MODU for Tangguh Development – Part 2Carl Erbrich, Kok Kuen Lee, Sydney Lam, Kee Kiat Tho, Hugo Galanes-Alvarez and Armedito Ramadhan2198
Earthquake Soil-Structure Interaction Assessments of Jack-Up MODU for Tangguh Development – Part 3Carl Erbrich, Kok Kuen Lee, Sidney Lam, Kee Kiat Tho, Hugo Galanes-Alvarez and Armedito Ramadhan2208
Jose G. Parra, Marcos Arroyo and Matteo CuantiaJose G. Parra, Marcos Arroyo and Matteo Cuantia2218
Punch-Through Risk of Spudcans: A Comparison of Design Models and Field MeasurementsPeter O. Van Impe, Adrianna Mirecka, Angelo van Tongeren and Kristine Vandenboer2228
Rapid Penetration of Spudcans in SandShiao Huey Chow, Britta Bienen and Mark Randolph2238
Spudcan Penetration in Sand-Over-Clay Considering Soil VariabilityLei Song, Tianlongyuan Qin and Jinhui Li2248