Author(s)

S. Takada & J. Ueno

Abstract

Present study shows the special consideration for the manhole which was up- lifted when Kushiro-Oki Earthquake Jan. 15th, 1993. A dynamic FEM effective-stress analysis is used to simulate the behavior of a manhole and to clear the mechanism of damage for buried structures subjected to liquefaction phenomena. 1 Introduction A big earthquake (M=7.8) attacked Kushiro City, the northern part of Japan, at 20:12 on January 15, 1993. At that time the weather was so cold, as the temperature went down below -10°C. Therefore the ground from surface to 0.5m-1.0m in depth was frozen. Seismic intensity is considered to be about V-JMA intensity(80-250 gals).

Keywords