突固め火山灰土の凍上に関する研究 : 第1報締固め曲線と凍上

概要

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A laboratory study was carried out to consider such soil factor that influenced frost heaving as dry density and soil texture, using compacted volcanic ash soil samples by impact. The frost heaving in compacted condition were fluctuated with changes in initial water content of soils or dry density. The rate of heaving increased as initial water content increased and then began to decrease when water content passed near optimum water content indicating maximum dry density. The maximum frost heaving occurred at drier side than optimum content and did not neccesarily coincide with optimum water content. The water content of freezing upper layer was the most and the water content of frost front was the least. The good linear relation exsisted between water content of unfrozen layer and porosity of samples. The maximum frost heaving according to soil texture decreased as dry density of sample increased. As it was believed that the size of soil particle influences frost heaving, increase of silt content made maximum heaving larger and as coefficient of uniformity of soils became larger or/and coefficient of curvature didn't become so larger, maximum heaving of sample was made larger. In cold region for compaction practices like embankment, therefore, not only mechanical strength but also frost heaving behavior should be considered.
帯広畜産大学の論文
1977-01-17