SEISMIC EVALUATION MODEL TEST OF COUPLED PILES WITH ITS INTERMEDIATE SOIL IMPROVEMENT METHOD IN SHEET PILE QUAY WALLS

Abstract

 Intermediate soil improvement method of coupled piles is to construct cement consolidation improvement on the ground around the piles, and is a new method devised with an expectation of increasing lateral resistance of coupled piles. The purpose of this study is to confirm the effect by large-scale model test toward the implementation of the improvement method. Therefore, the cross section assuming the actual structure was reproduced on 1/30 scale, and the dynamic model test was conducted with a underwater shaking table. The experimental results show that the improvement method reduces horizontal displacement of coupled piles even when the surrounding ground moves to the sea side with the sheet pile, and show that the effect is expected even in actual structures.