Capacity of Caissons in Dense Sand under Combined Loading
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 146, Issue 4
Abstract
This paper presents the development of an improved plasticity model to define the combined vertical and horizontal capacity of suction caisson in sand under low vertical loads, conditions relevant for foundations of offshore wind turbines. Model tests following a variety of load paths were used to demonstrate the change of the shape of the yield surface as a function of the vertical load applied and to provide parameters for plasticity modelling. A new hardening law is proposed that accounts for capacity changes because of caisson lateral movement in addition to the vertical movements normally solely considered. An updated formulation for the yield surface is then presented based on a normalization by the new hardening parameter. The plastic model is subsequently validated by comparison with test results. The model can be used to assist in the prediction of the capacity of suction caisson under combined loading at low vertical loads.
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Acknowledgments
This project was funded by the Australian Research Council, though the Discovery Programme scheme DP150102449. Model tests were undertaken with the support of the technical team at the National Geotechnical Centrifuge Facilities and their contribution is gratefully acknowledged. The second author is supported as the Fugro Chair in Geotechnics.
References
Andersen, K. H., J. D. Murff, M. F. Randolph, E. C. Clukey, C. T. Erbrich, H. P. Jostad, B. Hansen, C. Aubeny, P. Sharma, and C. Supachawarote. 2005. “Suction anchors for deepwater applications.” In Proc., 1st Int. Symp. on Frontiers in Offshore Geotechnics, ISFOG, 3–30. Boca Raton, FL: CRC Press.
Bolton, M. D. 1986. “The strength and dilatancy of sands.” Géotechnique 36 (1): 65–78. https://doi.org/10.1680/geot.1986.36.1.65.
Bolton, M. D., and C. K. Lau. 1993. “Vertical bearing capacity factors for circular and strip footings on Mohr-Coulomb soil.” Can. Geotech. J. 30 (6): 1024–1033. https://doi.org/10.1139/t93-099.
Bransby, M. F., and M. F. Randolph. 1998. “Combined loading of skirted foundations.” Géotechnique 48 (5): 637–655. https://doi.org/10.1680/geot.1998.48.5.637.
Butterfield, R., G. T. Houlsby, and G. Gottardi. 1997. “Standardized sign conventions and notation for generally loaded foundations.” Géotechnique 47 (5): 1051–1054. https://doi.org/10.1680/geot.1997.47.5.1051.
Butterfield, R., and J. Ticof. 1979. “Design parameters for granular soils (discussion contribution).” In Vol. 4 of Proc., 7th European Conf. on Soil Mechanics Foundation Engineering, 259–262. London: British Geotechnical Society.
Byrne, B., G. Houlsby, C. Martin, and P. Fish. 2002. “Suction caisson foundations for offshore wind turbines.” Wind Eng. 26 (3): 145–155. https://doi.org/10.1260/030952402762056063.
Byrne, B. W. 2000. “Investigations of suction caissons in dense sand.” Ph.D. thesis, Dept. of Engineering Science, Univ. of Oxford.
Byrne, B. W., and G. T. Houlsby. 1999. “Drained behaviour of suction caisson foundations on very dense sand.” In Proc., Offshore Technology Conf. Houston: Offshore Technology Conference.
Byrne, B. W., and G. T. Houlsby. 2001. “Observations of footing behaviour on loose carbonate sands.” Géotechnique 51 (5): 463–466. https://doi.org/10.1680/geot.2001.51.5.463.
Cassidy, M. J. 1999. “Non-linear analysis of jack-up structures subjected to random waves.” Ph.D. thesis, Dept. of Engineering Science, Univ. of Oxford.
Cassidy, M. J. 2007. “Experimental observations of the combined loading behaviour of circular footings on loose silica sand.” Géotechnique 57 (4): 397–401. https://doi.org/10.1680/geot.2007.57.4.397.
Cassidy, M. J., B. W. Byrne, and G. T. Houlsby. 2002. “Modelling the behaviour of circular footings under combined loading on loose carbonate sand.” Géotechnique 52 (10): 705–712. https://doi.org/10.1680/geot.2002.52.10.705.
Chow, S. H., A. Roy, M. Herduin, E. Heins, L. King, B. Bienen, C. D. O’Loughlin, C. Gaudin, and M. J. Cassidy. 2018. Characterisation of UWA superfine silica sand. Crawley, WA: Centre for Offshore Foundation Systems.
Cocjin, M., and O. Kusakabe. 2013. “Centrifuge observations on combined loading of a strip footing on dense sand.” Géotechnique 63 (5): 427–433. https://doi.org/10.1680/geot.11.P.075.
Dean, E. T. R., R. G. James, A. N. Schofield, F. S. C. Tan, and Y. Tsukamoto. 1993. “The bearing capacity of conical footings on sand in relation to the behaviour of spudcan footings of jackups.” In Proc., Wroth Memorial Symp. on Predictive Soil Mechanics, 230–253. London: Thomas Telford.
Dickin, E. A. 1994. “Uplift resistance of buried pipelines in sand.” Soils Found. 34 (2): 41–48. https://doi.org/10.3208/sandf1972.34.2_41.
Fang, Y.-S., Y.-C. Ho, and T.-J. Chen. 2002. “Passive earth pressure with critical state concept.” J. Geotech. Geoenviron. Eng. 128 (Oct): 651–659. https://doi.org/10.1061/(ASCE)1090-0241(2002)128:8(651).
Georgiadis, M. 1985. “Load-path dependent stability of shallow footings.” Soils Found. 25 (1): 84–88. https://doi.org/10.3208/sandf1972.25.84.
Gottardi, G., L. Govoni, and R. Butterfield. 2005. “Yield loci for shallow foundations by ‘swipe’ testing.” In Proc., 1st Int. Symp. on Frontiers in Offshore Geotechnics, ISFOG 2005. Boca Raton, Fl: CRC Press.
Gottardi, G., G. T. Houlsby, and R. Butterfield. 1999. “Plastic response of circular footings on sand under general planar loading.” Géotechnique 49 (4): 453–469. https://doi.org/10.1680/geot.1999.49.4.453.
Gourvenec, S., and M. Randolph. 2003. “Effect of strength non-homogeneity on the shape of failure envelopes for combined loading of strip and circular foundations on clay.” Géotechnique 53 (6): 575–586. https://doi.org/10.1680/geot.2003.53.6.575.
Govoni, L., G. Gottardi, and S. Gourvenec. 2010. “Centrifuge modelling of circular shallow foundations on sand.” Int. J. Phys. Modell. Geotech. 10 (2): 35–46. https://doi.org/10.1680/ijpmg.2010.10.2.35.
Govoni, L., S. Gourvenec, and G. Gottardi. 2011. “A centrifuge study on the effect of embedment on the drained response of shallow foundations under combined loading.” Géotechnique 61 (12): 1055–1068. https://doi.org/10.1680/geot.7.00109.
Houlsby, G. T., and M. J. Cassidy. 2002. “A plasticity model for the behaviour of footings on sand under combined loading.” Géotechnique 52 (2): 117–129. https://doi.org/10.1680/geot.2002.52.2.117.
Kay, S., and E. Palix. 2011. “Caisson capacity in clay: VHM resistance envelope. Part 2: VHM envelope equation and design procedure.” In Proc., 2nd Int. Symp. on Frontiers in Offshore Geotechnics, 741–746. London: CRC Press.
Lehane, B. M., and Q. B. Liu. 2013. “Measurement of shearing characteristics of granular materials at low stress levels in a shear box.” Geotech. Geol. Eng. 31 (1): 329–336. https://doi.org/10.1007/s10706-012-9571-9.
Liu, Q. B., and B. M. Lehane. 2012. “The influence of particle shape on the (centrifuge) cone penetration test (CPT) end resistance in uniformly graded granular soils.” Géotechnique 62 (11): 973–984. https://doi.org/10.1680/geot.10.P.077.
Martin, C. M. 1994. “Physical and numerical modelling of offshore foundations under combined loads.” Ph.D. dissertation, Dept. of Engineering Science, Oxford Univ.
Martin, C. M., and G. T. Houlsby. 1999. “Jackup units on clay: Structural analysis with realistic modelling of spudcan behaviour.” In Proc., Offshore Technology Conf. Houston: Offshore Technology Conference.
Martin, C. M., and G. T. Houlsby. 2000. “Combined loading of spudcan foundations on clay: Laboratory tests.” Géotechnique 50 (4): 325–338. https://doi.org/10.1680/geot.2000.50.4.325.
Montrasio, L., and R. Nova. 1988. “Assestamenti di una fondazione modello sotto carico inclinato: risultati sperimentali e modellazione matematica.” Rivista Italiana di Geotecnica 22 (1): 35–49.
Nova, R., and L. Montrasio. 1991. “Settlements of shallow foundations on sand.” Géotechnique 41 (2): 243–256. https://doi.org/10.1680/geot.1991.41.2.243.
Roscoe, K. H., and A. N. Schofield. 1956. “The stability of short pier foundations in sand.” Br. Weld. J. 3 (8): 343–354.
Salencon, J., and A. Pecker. 1995. “Ultimate bearing capacity of shallow foundations under inclined and eccentric loads. Part I: Purely cohesive soil.” Eur. J. Mech. A/solids 14 (3): 349–375.
Supachawarote, C., M. Randolph, and S. Gourvenec. 2004. “Inclined pull-out capacity of suction caissons.” In Proc., 14th Int. Offshore and Polar Engineering Conf., 500–506. Mountain View, CA: International Society of Offshore and Polar Engineers.
Tan, F. S. 1990. “Centrifuge and theoretical modelling of conical footings on sand.” Ph.D. thesis, Dept. of Engineering Science, Univ. of Cambridge.
Ticof, J. 1978. “Surface footings on sand under general planar loads.” Ph.D. dissertation, Dept. of Engineering Science, Univ. of Southampton.
Uesugi, M., and H. Kishida. 1986. “Influential factors of friction between steel and dry sands.” Soils Found. 26 (2): 33–46. https://doi.org/10.3208/sandf1972.26.2_33.
Ukritchon, B., A. J. Whittle, and S. W. Sloan. 1998. “Undrained limit analyses for combined loading of strip footings on clay.” J. Geotech. Geoenviron. Eng. 124 (3): 265–276. https://doi.org/10.1061/(ASCE)1090-0241(1998)124:3(265).
Villalobos, F. A., B. W. Byrne, and G. T. Houlsby. 2009. “An experimental study of the drained capacity of suction caisson foundations under monotonic loading for offshore applications.” Soils Found. 49 (3): 477–488. https://doi.org/10.3208/sandf.49.477.
White, D. J., C. Y. Cheuk, and M. D. Bolton. 2008. “The uplift resistance of pipes and plate anchors buried in sand.” Géotechnique 58 (10): 771–779. https://doi.org/10.1680/geot.2008.3692.
Zafeirakos, A., and N. Gerolymos. 2016. “Bearing strength surface for bridge caisson foundations in frictional soil under combined loading.” Acta Geotech. 11 (5): 1189–1208. https://doi.org/10.1007/s11440-015-0431-7.
Zhao, L., C. Gaudin, C. D. O’Loughlin, J. P. Hambleton, M. J. Cassidy, and M. Herduin. 2019. “Drained capacity of a suction caisson in sand under inclined loading.” J. Geotech. Geoenviron. Eng. 145 (2): 04018107. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001996.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 146 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Mar 29, 2019
Accepted: Oct 29, 2019
Published online: Feb 11, 2020
Published in print: Apr 1, 2020
Discussion open until: Jul 11, 2020
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