Author(s)

Susumu Yasuda, Hideo Nagase, Shigeru Itafuji, Hisashi Sawada & Keiichiro Mine

Abstract

The 1993 Kushiro-oki earthquake brought the floatation of many manholes and sewage pipes due to liquefaction in Japan. To study the mechanism of the floatation, several shaking table tests were carried out under several conditions of soil densities, specific gravities of pipes, water levels and diameters of pipes. Tests were also conducted on the model grounds in which a trench was excavated and then backfilled with loose sands. Test results show that the speed and the height of floatation are affected by soil density, the specific gravity of the pipe or manhole, water level, severity of liquefaction, and width and depth of the trench. 1 Introduction Many manholes and buried pi

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