Proceedings-DFI/EFFC 11th International Conference on Piling and Deep Foundations, 2014, Stockholm, Sweden, (DFI)
Centrifuge Test on Reduction of Lateral Flow of Liquefied Ground by Stabilized Columns
Yoshiyuki Morikawa, Hidenori Takahashi, Shinji Sassa and Eiji Kohama, Port and Airport Research Institute, Japan; Naoki Takahashi and Wakaki Tsuda, Sumitomo Mitsui Construction Company, Japan; Ikuo Towhata, The University of Tokyo, Japan
Deep mixing method has been employed increasingly in recent years as a countermeasure against subsoil liquefaction. Column-type solidification, however, has been thought to have little effect as a liquefaction countermeasure, because the shear deformation of unimproved soil between the columns cannot be reduced. In recent years, experimental results have been reported that imply that solidified columns can reduce the shear deformation of unimproved soil around them. A new arrangement has been proposed to mitigate lateral flow induced by liquefaction. In this study, a series of dynamic centrifuge model tests was conducted to verify the lateral flow resistance of stabilized columns. The results indicate that stabilized columns can reduce the lateral flow of liquefied ground if the column displacement and the column head rotation are restricted. This paper concludes that it is important to restrict the displacement and the rotation of the column head by surface improvement to mitigate the lateral flow of liquefied ground.
|article #1945; publication #100 (IC-2014)|