肝属平野低平地泥炭土の土質に関する研究 : I.理工学的性質

概要

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At Kimotsuki region of Kagoshima prefecture, there are peat soils extending over about 20 km^2 area. In 1974,settlement of paddy fields occurred at a part of the peat-area. Soil-investigations were made on the site and in the laboratory, the results are given in this report.It was found that the peat-layer has the thickness about 2 m within down to a depth of 3 m, and that it is separated into two parts ; upper and lower. The upper peat-layer has the thickness of 1.2 m, with mean water content of 180%, and its degree of decomposition of organic matter is 80〜90%. The lower peat-layer has the thickness of 0.7 m, with mean water content of 600%, and its degree of decomposition is 60〜70%. The time-settlement curves of these peat-specimens can be obtained with √t method. The log (de/dt)-log t graph at consolidation tests with disturbed specimens produce curves in the form of two tangents to a short arc. Whereas the graph with undisturbed specimens produces curves consisting of a straight line. The initial void ratio (e_0) affects the rates of consolidation (de/dt) of the undisturbed specimen to some extent, but the effects of the sampleheight (H) and the stress increment (Δp) are not definite in this investigation. It is indicated that the structural factors within the peat exert a considerable influence.
鹿児島大学の論文
1976-03-20