Experimental Investigation of Settlement Induced Bending Moments on Pile Supported T-Walls

  • Panagiota KokkaliEmail author
  • Tarek Abdoun
  • Anthony Tessari
Conference paper
Part of the Sustainable Civil Infrastructures book series (SUCI)


T-Walls are pile-supported concrete floodwalls that are part of the New Orleans flood protection system. They are typically founded on long concrete or steel battered piles and include a sheet pile cut off for seepage and gradient control. Since the soils in Southern Louisiana contain soft and compressible silt and clay, these floodwalls need to be designed to resist not only flood loads but also loads produced by consolidation of soft foundation soil under the weight of new fill placed on or near a T-Wall during construction. This is commonly referred to as downdrag and induces additional bending moments on the piles. It is important that the settlement induced bending moments are assessed and understood to ensure that they do not exceed allowable limits. In an attempt to develop a comprehensive T-Wall design procedure that appropriately considers field conditions, the United States Army Corps of Engineers (USACE) New Orleans District partnered with Rensselaer Polytechnic Institute (RPI) and Virginia Polytechnic Institute and State University and jointly developed a research program. A series of centrifuge tests was conducted at the Centrifuge Facility at RPI in order to gain insight into the mechanisms and magnitudes of downdrag-induced bending moments and provide reliable data sets for validation of numerical models. Different pile configurations and fill loading conditions were tested in an attempt to isolate the key parameters of the system response to downdrag forces. This paper describes the experimental methodology and discusses data from two centrifuge tests in view of the effect of an additional row of piles on the Protected Side of the system.



The financial support for this paper has been provided by the United States Army Corps of Engineers. The authors would also like to thank the staff and undergraduate researchers of the Center for Earthquake Engineering Simulation at RPI for their contribution to this project.


  1. Brandon, T.L., Wright, S.G., Duncan, J.M.: Analysis of the stability of I-Walls with gaps between the I-Wall and the levee fill. J. Geotech. Geoenviron. Eng. 134(5), 692–700 (2008)CrossRefGoogle Scholar
  2. Duncan, J.M., Brandon, T.L., Wright, S.G., Vroman, N.: Stability of I-walls in new orleans during hurricane katrina. J. Geotech. Geoenviron. Eng. 134(5), 681–691 (2008)CrossRefGoogle Scholar
  3. Interagency Performance Evaluation Taskforce (IPET): Performance evaluation of the New Orleans and Southeast Louisiana Hurricane Protection system. Draft final Report, U.S. Army Corps of Engineers (2006)Google Scholar
  4. Isenhower, W., Vasquez, L., Wang, S.: Analysis of settlement-induced bending moments in battered piles. In: From Soil Behavior Fundamentals to Innovations in Geotechnical Engineering, pp. 497–511 (2014)Google Scholar
  5. Kokkali, P., Tessari, A., Abdoun, T., Varuso, R., Johnson, J., Filz, G., Reeb, A.: Settlement induced bending moments on pile founded floodwalls. Under Revision in the Int. J. Phys. Model. Geotech. (2016)Google Scholar
  6. McGuire, M., Filz, G., Navin, M., Hokens, K.: LPILE Method for Evaluating Bending Moments in Batter Piles due to Ground Settlement for Pile-Supported Floodwalls in New Orleans and Vicinity, Rep. prepared for USACE Contract No. W912P8-07-D-0062 (2012)Google Scholar
  7. Reese, L.C., Associates: Evaluation of Bending in Batter Piles due to Settlement. Report prepared for FFEB Joint Venture, LLC, Lymon C. Reese & Associates, Austin, TX (2011)Google Scholar
  8. Sasanakul, I., Vanadit-Ellis, W., Sharp, M., Abdoun, T., Ubilla, J., Steedman, S., Stone, K.: New Orleans levee system performance during Hurricane Katrina: 17th Street Canal and Orleans Canal North. J. Geotech. Geoenviron. Eng. 134(5), 657–667 (2008)CrossRefGoogle Scholar
  9. Sills, G.L., Vroman, N.D., Wahl, R.E., Schwanz, N.T.: Overview of New Orleans levee failures: lessons learned and their impact on national levee design and assessment. J. Geotech. Geoenviron. Eng. 134(5), 556–565 (2008)CrossRefGoogle Scholar
  10. Tessari, A.: Centrifuge modeling of the effects of natural hazards on pile-founded concrete floodwalls. Ph.D. Dissertation, Rensselaer Polytechnic Institute, Troy, NY (2012)Google Scholar
  11. Ubilla, J., Abdoun, T., Sasanakul, I., Sharp, M., Steedman, S., Vanadit-Ellis, W., Zimmie, T.: New Orleans levee system performance during hurricane Katrina: London Avenue and Orleans canal south. J. Geotech. Geoenviron. Eng. 134(5), 668–680 (2008)CrossRefGoogle Scholar
  12. USACE: Hurricane and Storm Damage Risk Reduction System Design Guidelines, Interim with revisions through June 2012, USACE, New Orleans (2012)Google Scholar

Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  • Panagiota Kokkali
    • 1
    Email author
  • Tarek Abdoun
    • 2
  • Anthony Tessari
    • 3
  1. 1.WSP|Parsons BrincherhoffNew YorkUSA
  2. 2.Department of Civil and Environmental EngineeringRensselaer Polytechnic InstituteTroyUSA
  3. 3.Department of Civil, Structural and Environmental EngineeringUniversity at BuffaloBuffaloUSA

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