Abstract
The method for estimating the settlement of spread foundation on Masa-do ground is presented through considering the behavior of compressibility from plate bearing test and confined compression test. The contents and results of this paper is summarized as follows; 1) The relationships between N-value and Nsw-value, coefficient of subgrade reaction and plate width etc. are presented and examined. Consequently, it becomes possible to estimate the immediate settlement from a small plate bearing test. 2) When the settlement after 15 minutes, which corresponds to the loading time, is regarded as immediate settlement, viscosity parameter becomes a simple equation. And when an arbitrary load increment ratio and an arbitrary amount of load is given, we can easily estimate an amount of settlement taking a certain time in each load step. Creep settlement increases according to the softness of the ground and the number of the load steps by the effect of viscosity parameter. 3) As the compression mechanism by the compression test is different from the mechanism by the plate bearing test, so their settlement are different from each other. These two settlement are compared and examined under some varieties of Nsw-value and load. It is necessary to use the coefficient of settlement conversion from the confined compression test in order to estimate the settlement of spread foundation. 4) From the plate bearing test, the confined compression test and Nsw-value, we can estimate an amount of settlement using the above mentioned procedure and its result.
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