Effect of Local and Global Scour on Lateral Response of Single Piles in Different Soil Conditions
- 1 Department of Irrigation and Hydraulics, Faculty of Engineering, Ain Shams University, Cairo, Egypt
Abstract
Marine structures, offshore platforms and bridge piers are usually supported on foundation piles. These piles are subjected to lateral loading due to wind, waves and currents. Piles installed in marine or river environments are susceptible to scour depending on wave and current characteristics and soil types. In this paper, the effect of local and global scour on behavior of laterally loaded piles installed in different soil conditions has been investigated. Finite element model (FEM) using the software program PLAXIS and Winkler model using the software program LPILE were used in the analyses. Different parameters were investigated such as soil types, scour depth, scour hole dimension, pile material, submerged condition, magnitude of lateral load and load eccentricity. The results showed that scour has a significant impact on piles installed in sand and a less significant impact on piles installed in clay. Global scour has a significant impact on pile lateral displacement and bending stresses. The effect of scour is more significant if piles are subjected to large lateral loads due to the nonlinear response of pile-soil system. Effect of scour of stiff clayey soils on piles is more pronounced than that of soft clayey soils.
- B. M. Sumer, J. Freds?e and N. Christiansen, “Scour around a Vertical Pile in Waves,” Journal of Waterway, Port, Coastal and Ocean Engineering, Vol. 118, No. 1, 1992, pp. 15-31. doi:10.1061/(ASCE)0733-950X(1992)118:1(15)
- I. N. Robertson, H. R. Riggs, S. C. Yim and Y. L. Young, “Lessons from Hurricane Katrina Storm Surge on Bridges and Buildings,” Journal of Waterway, Port, Coastal and Ocean Engineering, Vol. 133, No. 6, 2007, pp. 463-483. doi:10.1061/(ASCE)0733-950X(2007)133:6(463)
- J. L. Briaud, H. C. Chen, K. W. Kwak, S. W. Han and F. C. K. Ting, “Multiflood and Multilayer Method and Scour Rate Prediction at Bridge Pier,” Journal of Geotechnical and Geoenvironemntal Engineering, Vol. 127, No. 2, 2001, pp. 114-125. doi:10.1061/(ASCE)1090-0241(2001)127:2(114)
- J. L. Briaud, H. C. Chen and P. Nurtjahyo, “SRICOS- EFA Method for Complex Piers in Fine-Grained Soils,” Journal of Geotechnical and Geoenvironemntal Engineer- ing, Vol. 130, No. 11, 2004, pp. 1180-1191.
- M. Rambabu, S. N. Rao and V. Sundar, “Current-Induced Scour around a Vertical Pile in Cohesive Soil,” Ocean Engineering, Vol. 30, No. 7, 2003, pp. 893-920. doi:10.1016/S0029-8018(02)00063-X
- Y. N. Kishore, S. N. Rao and J. S. Mani, “Influence of the Scour on Laterally Loaded Piles,” The 12th International Conference of International Association for Computer Methods and Advances in Geomechanics, Goa, 1-6 October 2008, pp. 3283-3288.
- Y. N. Kishore, S. N. Rao and J. S. Mani, “The Behaviour of Laterally Loaded Piles Subjected to Scour in Marine Environment,” KSCE Journal of Civil Engineering, Vol. 13, No. 6, 2009, pp. 403-406. doi:10.1007/s12205-009-0403-2
- C. Lin, C. Bennett, J. Han and R. L. Parsons, “Scour Effects on the Response of Laterally Loaded Piles Considering Stress History of Sand,” Computers and Geotechnics, Vol. 37, No. 7-8, 2010, pp. 1008-1014. doi:10.1016/j.compgeo.2010.08.009
- A. W. Niedoroda, C. Dalton and R. G. Bea, “The Descriptive Physics of Scour in the Ocean Environment,” Proceedings of the 13th Offshore Technology Conference, Houston, 1981, Paper No. 4145.
- M. B. Zaaijer and J. Tempel, “Scour Protection: A Necessity or a Waste of Money?” Proceedings of the 43 IEA Topixal Expert Meeting, Stockholm, 2004, pp. 43-51.