Profile and Frictional Capacity of a Mooring Line Embedded in Sand via Centrifuge Model Testing
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 140, Issue 10
Abstract
The authors present a method for calculating a mooring line’s tension and angle of inclination at the anchor pad eye to analyze the behavior of a mooring line embedded in sand. They adopted the governing equation from a previous study for clay and reanalyzed the frictional and bearing resistances. The authors performed a number of centrifuge tests at two anchor depths while maintaining relative densities of 76 or 51% in the cylindrical test box to validate the proposed analytical method. The analytical solutions agreed well with the test results and the results of the simplified method. The authors conducted a parametric study to evaluate the effects of various factors on the behavior of an embedded mooring line in sand, including the depth of the attachment point, the internal friction angle of sand, the submerged unit weight of sand, the angle of the mooring line on the seabed, and the self-weight and nominal diameter of the mooring line. The results demonstrated that the proposed analytical method is effective for analyzing the behavior of a mooring line embedded in sand.
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Acknowledgments
The authors thank the Korea Institute of Ocean Science Technology for their funding (PE98942). This research was supported by a grant Development of Cutting Edge Technologies for the Multi-Faceted Representation of Design Earthquake Ground Motions Based on Analyses of Acceleration Records [NEMA-NH-2013-71] from the Natural Hazard Mitigation Research Group of the National Emergency Management Agency of Korea.
References
Andersen, K. H., et al. (2005). “Suction anchors for deep water application.” Proc., Int. Symp. on Frontiers in Offshore Geotechnics (ISFOG), CRC Press, Boca Raton, FL, 3–30.
Bang, S., Han, H., and Taylor, R. J. (2000). “Calibration of analytical solution using centrifuge model tests on mooring lines.” Int. J. Offshore Polar Eng., 10(3), 711–717.
Bolton, M. D., et al. (1999). “Centrifuge cone penetration tests in sand.” Géotechnique, 49(4), 543–552.
Cassidy, M. J., Gaudin, C., Randolph, M. F., Wong, P. C., Wang, D., and Tian, Y. (2012). “A plasticity model to assess the keying of plate anchors.” Géotechnique, 62(9), 825–836.
Colliat, J.-L. (2002). “Anchors for deepwater to ultradeepwater moorings.” Proc., Offshore Technology Conf., Society of Petroleum Engineers, Richardson, TX.
Coyle, H. M., and Castello, R. R. (1981). “New design correlations for piles in sand.” J. Geotech. Engrg. Div., 107(7), 965–986.
Degenkamp, G., and Dutta, A. (1989). “Soil resistances to embedded anchor chain in soft clay.” J. Geotech. Engrg., 1420–1438.
Dutta, A., and Degenkamp, G. (1989). “Behavior of embedded mooring chains in clay during chain tensioning.” Proc., 21st Annual Offshore Technology Conf., Society of Petroleum Engineers, Richardson, TX.
Elkhatib, S. (2005). “The behaviour of drag-in plate anchors in soft cohesive soils.” Ph.D. thesis, Univ. of Western Australia, Perth, Australia.
Elkhatib, S., Lonnie, B., and Randolph, M. F. (2002). “Installation and pull-out capacities of drag-in plate anchors.” Proc., 12th Int. Offshore and Polar Engineering Conf., International Society of Offshore and Polar Engineers, Mountain View, CA, 648–654.
Han, H.-S., Jeon, S.-K., Chang, D.-H., and Chang, S.-Y. (2006). “Anchor and mooring line analysis in cohesive seafloor.” J. Korean Geotech. Soc., 22(3), 37–43.
Kim, D.-S., Kim, N.-R., Choo, Y. W., and Cho, G.-C. (2013). “A newly developed state-of-the-art geotechnical centrifuge in Korea.” KSCE J. Civ. Eng., 17(1), 77–84.
Neubecker, S. R. (1995). “The behaviour of drag anchor and chain systems.” Ph.D. thesis, Univ. of Western Australia, Perth, Australia.
Neubecker, S. R., and Randolph, M. F. (1995). “Profile and frictional capacity of embedded anchor chains.” J. Geotech. Engrg., 797–803.
Neubecker, S. R., and Randolph, M. F. (1996). “The performance of drag anchor and chain systems in cohesive soil.” Mar. Georesour. Geotechnol., 14(2), 77–96.
O’Neill, M. P., Bransby, M. F., and Randolph, M. F. (2003). “Drag anchor flukesoil interaction in clays.” Can. Geotech. J., 40(1), 78–94.
Skempton, A. W. (1951). “The bearing capacity of clays.” Proc., Building Research Congress, Royal Meteorological Society, Reading, U.K.
Supachawarote, C. (2006). “Inclined load capacity of suction caisson in clay.” Ph.D. thesis, Univ. of Western Australia, Perth, Australia.
Taylor, R. N., ed. (1995). Geotechnical centrifuge technology, Blackie Academic and Professional, Glasgow, Scotland, 27–28.
Terzaghi, K. (1943). Theoretical soil mechanics, Wiley, New York.
Tian, Y., Gaudin, C., Cassidy, M. J., and Randolph, M. F. (2013). “Considerations on the design of keying flap of plate anchors.” J. Geotech. Geoenviron. Eng., 1156–1164.
Vivatrat, V., Valent, P. J., and Ponterio, A. A. (1982). “The influence of chain friction on anchor pile design.” Proc., 14th Annual Offshore Technology Conf., Society of Petroleum Engineers, Richardson, TX, 153–163.
Yang, M., Aubeny, C. P., and Muff, J. D. (2012). “Behavior of suction embedded plate anchors during keying process.” J. Geotech. Geoenviron. Eng., 174–183.
Zdravkovic, L., Potts, D. M., and Jardine, R. J. (1998). “Pull-out capacity of bucket foundations in soft clay.” Proc., Int. Conf. on Offshore Site Investigation and Foundation Behaviour, Society for Underwater Technology, London, 301–324.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 140 • Issue 10 • October 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 5, 2013
Accepted: Jul 1, 2014
Published online: Jul 24, 2014
Published in print: Oct 1, 2014
Discussion open until: Dec 24, 2014
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