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Geomechanics and Engineering Volume 33, Number 2, April25 2023 , pages 155-165 DOI: https://doi.org/10.12989/gae.2023.33.2.155 |
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Cost-effective method for reducing local failure of floodwalls verified by centrifuge tests |
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Chung R. Song, Binyam Bekele, Brian D. Sawyer, Ahmed Al-Ostaz,Alexander Cheng and Vanadit-Ellis Wipawi
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| Abstract | ||
| Hurricane Katrina swept New Orleans, Louisiana, USA, in 2005, causing more than 1,000 fatalities and severe damage to the flood protection system. Recovery activities are complete, however, clarifying failure mechanisms and devising resilient and cost-effective retrofitting techniques for the flood protection system are still of utmost importance to enhance the general structural integrity of water retaining structures. This study presents extensive centrifuge test results to find various failure mechanisms and effective retrofitting techniques for a levee system. The result confirmed the rotational failure and translational failure mechanisms for the London Ave. Canal levee and 17th St. Canal levee, respectively. In addition, it found that the floodwalls with fresh waterstop in their joints perform better than those with old/weathered waterstop by decreasing pore water pressure build-up in the levee. Structural caps placed on the top of the joints between I-walls could also prevent local failure by spreading the load to surrounding walls. At the same time, the self-sealing bentonite-sand mixture installed along the riverside of floodwalls could mitigate the failure of floodwalls by blocking the infiltration of seepage water into the gap formed between levee soils and floodwalls. | ||
| Key Words | ||
| centrifuge test; floodwall; levee; retrofitting technique; self-sealing | ||
| Address | ||
| Chung R. Song and Brian D. Sawyer: University of Nebraska – Lincoln, Prem Paul Research Center, Lincoln, NE 68583, USA Binyam Bekele: Ardaman and Associates, Inc, A Tetra Tech Company, Orlando, FL 32809, USA Ahmed Al-Ostaz and Alexander Cheng: Department of Civil Engineering, University of Mississippi, 207B Carrier, University, MS 38677, USA Vanadit-Ellis Wipawi: Centrifuge Research Center, USACE-ERDC, Vicksburg, MS 39183, USA | ||