The relations between properties of compacted soils, water content, coarse particle content and compactive effort were studied. The index properties of soils which are preferable for core material in our country were obtained. The added materials to mix in the core, and one of the field mixing methods were also explained. Field compaction method was studied and it was discovered that tamping roller was fitted for soils at optimum water content and rubber tired roller was fitted even for the wetter side. Some considerations have been made for tamping roller.The method for controlling field compaction was discussed, and the allowable limits of soil conditions were considered to be not necessary to fix within a narrow range determined by soil tests.

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It was keenly felt, when the author was engaged in the work of dealing with the results of the soil tests of the marine soil samples of the Sakai Channel in 1959, that a quantitative representation of their grading, if possible, might facilitate the comparison and the description of various samples.In the present paper, the author introduces typical statistical measures, such as the moment measures, the quartile measures, the graphic moment measures, and describes their signification, characteristics, and calculation, as well as their mutual relationship.

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The settlement of buildings resting on a volcanic clay, known as Kanto loam, shows particular behavior which is quite different from that of sedimentary staurated clay. The authors have been observing for about eight years the actual settlement of buildings built on the Kanto loam. The Kanto loam is a very porous, unsaturated clay. The compression of this clay consists mainly of the initial compression (imemediate compression) and the following creep, the consolidation process being practically ignored. This paper deals mainly with an experimental approach to the compressibility of the Kanto loam. Long term compression tests were made and the rate of the creep was observed. It has been observed from these tests that both the volumetric creep and the shearing creep exist and they proceed straightly against the logarithm of the elapsed time. Comparison has been also made between the observed and calculated settlement, and the result shows a fairly satisfactory agreement.

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When a high embankment is constructed on soft ground, there usually arises a problem of bearing capacity and settlement of foundation. Usual practice to solve such problem is to determine the unconfined compressive strength and other various consolidation coefficients of clay by laboratory tests before establishing construction program. Generally, due to the existence of unknown factors concerned, the theoretical estimation often fails to coincide the actual result and the safe and economical construction program is not easily established based on only laboratory results. Test fill construction is frequently used to understand more precisely the actual behavior of the embankment and foundation. However, the dificulty of the analysis still leaves the problem.A test fill was constructed in Mihara Road Improvement Project and pore pressure and amount of settlement were measured for 110 days after construction. Date were analysed in comparison with laboratory results.In this paper, the authors wish to show some theoretical correlations between the calculations and measurements on this test fill.

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