抄録
The Sand Compaction Pile (SCP) method is considered to be a displacement type pile method, in which a considerable amount of "set-up" of the undrained shear strength of the surrounding clay is anticipated. A simplified procedure for analyzing the set-up problem is presented in two stages. The first stage is the soil-water coupled rigid plastic finite element method which is employed for solving undrained failure of clay due to pile driving, and the other, a linear elastic consolidation computation which accounts for the decrease of void ratio of the clay after pile driving. The value of this simplified method is examined through (1) laboratory set-up experiment on a remoulded Kawasaki clay using a triaxial apparatus aud (2) the case record of in-situ loading test on soft clay improved with the SCP method. In the latter case, extensive improvement in the soft clay was found particularly at a large depth of the soft clay layer, where the set-up ratio was more than two.
