小型基礎の原位置実験より得られたパイルド・ラフト基礎の水平挙動

Abstract

This paper describes the behavior of pile raft foundations obtained from in-situ horizontal loading tests carried on practical but downsized foundation models. Three foundation types, the raft foundation, the pile foundation and the piled raft foundation were tested to clear the behavior of piled raft foundations under horizontal load. Each foundation consists of a concrete block of 2m square with different height, and four steel pipe piles of 48.6mm in diameter in cases of the pile foundation and piled raft foundation. The test results indicate following observations. The final resistance of the piled raft foundation is larger than the summation of those of the raft foundation and the pile foundation. The bending moment of the piles in the piled raft foundation is smaller than that in the pile foundation at same horizontal displacements. In the piled raft foundation, the horizontal load is mainly transferred to the ground through the raft at the beginning of the loading, and is supported more by the piles as the horizontal displacement increases.