The Partial Floating Sheet-pile (PFS) method is a method used to install sheet-piles near the toe of an embankment to inhibit the settling of the embankment built on soft clay ground. This method combines partially floating sheet-piles and end-bearing sheet-piles. Originally, the PFS method was developed as an anti-subsidence countermeasure by the weight of a river embankment built on soft clay ground in a residential area. The PFS method could be effective against soil deformation caused by consolidation and liquefaction during the 2016 Kumamoto earthquake. However, quantitative discussions are still needed to clarify its effectiveness against liquefaction. Therefore, the authors carried out numerical analyses using LIQCA3D17 to evaluate the effectiveness of the PFS method quantitatively. As a result, the interval between the end-bearing sheet-piles was found to be an important factor for embankment settlement, and the installation of the end-bearing sheet-piles alternately could be reasonable.
A large earthquake such as Nankai Trough Earthquake is concerned to occur in the near future and there is fear that coastal levees will sink by liquefaction. Authors proposed installing double sheet-piles into the levee and additionally combining another sheet-pile as a partition wall perpendicular to the extension direction to the levee. It has been confirmed by model tests that this countermeasure is very effective for the deformation/settlement reduction of levees during an earthquake. However, since the partition wall was modelled by the steel plate in the model tests, the effect of the joints between sheet-piles could not be taken into consideration. Authors also reproduced the model test results by using a two-dimensional effective stress analyses (code:LIQCA2D12) with high accuracy. In the numerical study, the slippage effect of joints between sheet-piles for the partition wall was taken into account. As a result, it was confirmed that the shear distortion generated between the joints weakens the constraint of the ground inside double sheet-piles, but in spite of this negative effect, the settlement of levee was reduced down to 15% compared to the case without countermeasure.
There is a fear that coastal levees will sink by liquefaction due to large earthquakes such as the Nankai Trough earthquake in Japan. To overcome this damage, as one of the major countermeasures, the application of double sheet-pile walls to coastal levees has been proposed. In this study, to enhance the performance of this countermeasure, the authors focus on installing partition walls perpendicular to sheet-piles. By the shaking model test and numerical analysis, remarkable inhibition of the levee deformation/settlement was confirmed.
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