Publication Abstract

Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)

68 Settlement Behavior of the Raft Foundation with Friction Piles
K. Yamashita & M. Kakurai Takenaka Technical Research Laboratory, Tokyo, Japan

This paper describes field observations of a four-story reinforced concrete building supported on a raft foundation with friction piles at large spacing on soil composed of diluvial overconsolidated clay and sand. To confirm the validity of the design, the settlement, axial forces on selected three piles , the earth pressure on the underside of the raft were measured to the time about three years after the building completion. At the time of the completion, the maximum measured settlement was around 1cm. The ratio of the sum of the three measured pile-head loads to the building load on the tributary area was 51%. It increased slightly and reached 56% as a mean since one year after the building completion. An analytical study based on elastic theory considering the interaction among the raft, soil and the piles was also carried out.

 article #507; publication #37 (IC-1991-IT)