Abstract
This paper contains the design procedure of the Takashima Pier No. 3, a large scale pier on the deep soft alluvium, depth of ten meters below L. W. L., the surcharge of 3.0t/m2, and also designed so as to resist for seismic forces. The pier had been to be constructed on the soft clay strata of more than thirty meters thick. The magnitude of the cohesion assumed in this design of the foundation decided by the following methods, namely, the performance of unconfined compression tests of undisturbed samples, results of loading tests of piles at the construction site and the analysis of the existing structures near the construction site. The depth and inclination of the hard pan under the soft clay strata were found by the results of boring, pile driving and seismic prospecting. Following to the results of these studies, framed caissons on the friction piles were adapted as the main structure of the pier.
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