Loss in Anchor Embedment during Plate Anchor Keying in Clay
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 135, Issue 10
Abstract
Vertically installed plate anchors have been investigated in this paper by numerical analysis and centrifuge modeling. In the numerical analysis, the large deformation finite-element method (remeshing and interpolation technique with small strain) was used to simulate strip plate anchor rotation. In the centrifuge model tests, transparent soils were used to observe square anchor rotation. The loss in anchor embedment during anchor keying was assessed for anchors in uniform and normally consolidated soils with anchor pullout angle varying from 30° to 90° to the horizontal. It was found that the loss in anchor embedment during anchor keying may be expressed in terms of a nondimensional anchor geometry factor, which is a function of the eccentricity of the padeye, angle of loading, and the net moment applied to the anchor at the stage where the applied load balances the anchor weight. However, once the anchor geometry factor reaches a certain value, the loss in anchor embedment stabilizes at 0.25–0.5 times the anchor width. The loss in anchor embedment decreases linearly with decreasing pullout angle. Simple formulae and design procedures have been proposed to estimate the loss in anchor embedment during keying.
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Acknowledgments
The research presented here is supported by the Australian Research Council (ARC) through the Discovery Project scheme (DP0344019). This support is gratefully acknowledged. Experiments could not have been performed without the support of the Centre for Offshore Foundation Systems (COFS), established and supported under the ARC’s Research Centres Program, and special thanks to the technician Mr. Bart Thompson.UNSPECIFIED
References
Aubeny, C. P., Murff, D. J., and Roesset, J. M. (2001). “Geotechnical issues in deep and ultra deep waters.” Int. J. Geomech., 1(2), 225–247.
Benson, D. J. (1989). “An efficient, accurate, simple ale method for nonlinear finite element programs.” Comput. Methods Appl. Mech. Eng., 72(3), 305–350.
Carter, J. P., and Balaam, N. (1990). AFENA user’s manual, Geotechnical Research Centre, The University of Sydney, Sydney, Australia.
Dove, P., Treu, H., and Wilde, B. (1998). “Suction embedded plate anchor (SEPLA): A new anchoring solution for ultra-deepwater mooring.” Proc., Deep Offshore Tech. Conf., New Orleans.
Ehlers, C. J., Young, A. G., and Chen, J. H. (2004). “Technology assessment of deepwater anchors.” Proc., Annual Offshore Technology Conf., Houston, Paper OTC 16840.
Finnie, I. M. S., and Randolph, M. F. (1994). “Punch-through and liquefaction induced failure of shallow foundations on calcareous sediments.” Proc., Int. Conf. on Behaviour of Offshore Structures, Boston, 217–230.
Gaudin, C., O’Loughlin, C. D., Randolph, M. F., and Lowmass, A. C. (2006). “Influence of the installation process on the performance of suction embedded plate anchors.” Geotechnique, 56(6), 381–391.
Ghosh, S., and Kikuchi, N. (1991). “An arbitrary Lagrangian-Eulerian finite element method for large deformation analysis of elastic-viscoplastic solid.” Comput. Methods Appl. Mech. Eng., 86(2), 127–188.
Gill, D. R. (1999). “Experimental and theoretical investigations of pile and penetrometer installation in clay.” Ph.D. thesis, Trinity College, Dublin.
Hu, Y., and Randolph, M. F. (1998a). “H-adaptive FE analysis of elasto-plastic non-homogeneous soil with large deformation.” Comput. Geotech., 23(1–2), 61–83.
Hu, Y., and Randolph, M. F. (1998b). “A practical numerical approach for large deformation problems of soil.” Int. J. Numer. Analyt. Meth. Geomech., 22(5), 327–350.
Iskander, M. G., Lai, J., Oswald, C. J., and Mannheimer, R. J. (1994). “Development of a transparent material to model the geotechnical properties of soils.” Geotech. Test. J., 17(4), 425–433.
Naval Civil Engineering Laboratory (NCEL). (1985). Handbook for marine geotechnical engineering, U.S. Naval Civil Engineering Laboratory, Port Hueneme, Calif.
Neubecker, S. R., and Randolph, M. F. (1995). “Profile and frictional capacity of embedded anchor chains.” J. Geotech. Eng., 121(11), 797–803.
O’Loughlin, C. D., Lowmass, A., Gaudin, C., and Randolph, M. F. (2006). “Physical modelling to assess keying characteristics of plate anchors.” Proc., Int. Conf. on Physical Modelling in Geotechnics 2006, Balkema, Rotterdam.
Randolph, M. F., Cassidy, M. J., Gourvenec, S., and Erbrich, C. (2005) “Challenges of offshore geotechnical engineering.” Proc., 16th Int. Conf. on Soil Mech. and Geotech. Engrg., Vol. 1, Balkema, Rotterdam, 123–176.
Stewart, D. P., Boyle, R. S., and Randolph, M. F. (1998). “Experience with a new drum centrifuge.” Proc. Int. Conf. Centrifuge 1998, Balkema, Rotterdam, 35–40.
Stewart, D. P., and Randolph, M. F. (1994). “T-bar penetration testing in soft clay.” J. Geotech. Engrg. Div., 120(12), 2230–2235.
White, D. J., Take, W. A., and Bolton, M. D. (2003). “Soil deformation measurement using particle image velocimetry (PIV) and photogrammetry.” Geotechnique, 53(7), 619–631.
Wilde, B., Treu, H., and Fulton, T. (2001). “Field testing of suction embedded plate anchors.” Proc., 11th Int. Offshore and Polar Engineering Conf., Stavanger, 544–551.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 135 • Issue 10 • October 2009
Pages: 1475 - 1485
Copyright
© 2009 ASCE.
History
Received: Sep 16, 2008
Accepted: Feb 7, 2009
Published online: Mar 20, 2009
Published in print: Oct 2009
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