Abstract
Liquefaction-induced flow occurred in the liquefied ground behind seawalls and river revetments during several past earthquakes. The authors considered that a countermeasure by installing piles between seawalls and pile foundations, would prevent the liquefaction-induced flow. As the preventing piles were not continuous, this method can be applid in the area where many buried structures are existing, such as oil plants, harbors and so on.
Then, shaking table tests and three dimensional residual analyses were conducted to demonstrate the effectiveness of the preventing piles. Two types of model countermeasures, preventing piles and a sheet pile, were placed between a seawall and a pile foundation. In the first countermeasure, preventing piles were constructed with square and triangular arrangements. Test and analyzed results showed that the installation of the two types of countermeasures was able to reduce displacement of the pile foundation. In the preventing piles, the trianglar arrangement was more effective than the square arrangement.
