Deformation of Composite Breakwaters Due to Ground Shaking

Sekiguchi, Hideo; Kita, Koji; Hashimoto, K.; Katsui, Hidehiro

doi:10.3208/sandf.36.special_169

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…The behavior of the breakwater with respect to liquefaction was difficult to investigate. Using the acoustic technique sand boils were confirmed on the seabed at the surface of the loose deposit at the edge of the rubble foundation of a breakwater located nearby (Sekiguchi et al, 1996). This indicates that liquefaction occurred in this portion of the loose deposit.…”

Section: Pneumatic Caisson Foundationsmentioning

confidence: 81%

Effective Stress Analyses of Port Structures

Iai

Ichii

Liu

et al. 1998

SOILS AND FOUNDATIONS

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Effective stress analyses are performed on the seismic response of port structures during the 1995 Hyogoken-Nambu earthquake. The structures analyzed include: caisson type quay walls which moved up to 5 m maximum toward the sea; pneumatic caisson type bridge foundations which moved toward the sea, reducing the distance between the bridge foundations across a sea channel by a total of 0.8 m; and composite breakwaters which settled 2 m. Although these structures were all a rigid concrete type and shaken by the same earthquake, the mode and extent of deformation/ failure were different depending on the backfill and embedment conditions of the structures.The constitutive model of soil used for the seismic analyses is a multiple mechanism model defined in strain space. The model can take the effect of principal stress axis rotation into account, which is known to play an important role in the cyclic behavior of sand under anisotropic stress conditions. The model parameters are calibrated based on insitu and laboratory investigations, including in-situ freeze sampling. The results of the effective stress analyses are consistent with those measured, including the mode and extent of deformation/ failure, suggesting that the cyclic behavior of soil, idealized through the effective stress model, can explain the variety of seismic response of the port structures in a unified manner.

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Section: Pneumatic Caisson Foundationsmentioning

confidence: 81%