Enhancing Coastal Levees’ Resiliency against Strong Earthquakes and Tsunamis with Pressed-In Piles
Publication: Geo-Extreme 2021
ABSTRACT
One of the major factors contributing to the damage of levees and other coastal structures during a strong earthquake is liquefaction of the foundation soil and levee embankment soil. To mitigate this risk, Japan’s central government and a regional government are improving a total of 23 km of coastal levees on the east and west sides of the southern city of Kochi which faces the Pacific Ocean. The existing levee structures are 30–40 years old and made of earthen fill materials with concrete linings and parapets on top. Liquefaction of levee foundations has been a great concern due to its underlying sandy soil with a high-ground water level. Sheet pile and pipe pile-reinforced structures are being constructed inside the existing earthen levees to minimize the detrimental effects of liquefaction and tsunami forces on the postevent flood protection of the levees. Both types of piles are being constructed with the press-in piling method without removing the existing structures during construction. This paper provides a case study of the effectiveness of the press-in piling method to construct these improvements.
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References
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Geo-Extreme 2021
Pages: 21 - 33
Copyright
© 2021 American Society of Civil Engineers.
History
Published online: Nov 4, 2021
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