Publication Abstract

Proceedings of the Deep Mixing 2015 Conference, (DFI)

Development of Lattice-Shaped Cement Treatment Method for Liquefaction Countermeasure
Naotoshi Shinkawa, Fudo Tetra, Japan; Yoshiyuki Morikawa, Port and Airport Research Institute, Japan; Hidenori Takahashi, Port and Airport Research Institute, Japan; Makoto Yoshida, Penta-Ocean Construction Co., Ltd., Japan; Masaya Kawata, Shimizu Corporation, Japan; Kazuo Konishi, Takenaka Civil Engineering & Construction Co., Ltd., Japan; Hirofumi Taguchi, Toa Corporation, Japan; Seiji Mizutani, Toyo Construction, Japan

The lattice-shaped cement treatment method has been used to improve the seismic performance of liquefied sandy soil in Japan. The efficacy of the method has been confirmed by the huge earthquake in Japan. In the present study, a new method to improve sandy ground by using the lattice-shaped cement treatment method is proposed as a liquefaction countermeasure. It is the floating-type and lattice-shaped cement treatment method, where cement treated soil is not fixed to an un-liquefiable stratum. In this method, a fixed-type structure such as treated soil should be formed at the side of the floating-type treated soil to reduce its lateral displacement. In the study, one-dimensional dynamic response analyses were firstly conducted to confirm the mechanism of the new method. Secondly, a series of centrifuge model tests were performed to demonstrate the effect in a proto-type scale's stress condition. The analyses and model tests confirmed the effect of liquefaction countermeasure of the new method.

 article #2033; publication #1013 (DM-2015)