突固め火山灰土の凍上に関する研究 : 第2報乾燥密度と凍上

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In order to understand the effect of dry density, one of the factors of frost heaving, laboratory experiments in freezing were conducted with four compacted volcanic ash soils and clay mixture under constant initial water content and thermal conditions. Result were summarized as follows. (1) The rate of frost heaving for volcanic ash soils was proportional to the cumulative uptake of the water which moved at freezing and expressed a linear relation. In addition, this relation did not vary with soil texture. (2) Increasing dry density decreased cumulative water uptake and the degree of saturation did not vary with dry density, becoming a constant value. (3) Frost heaving decreased linearly as dry density increased and the slope of heaving decreased rapidly as the degree of saturation for samples was lower. (4) Increasing cumulative water uptake at freezing increased apparent depth of frost but decreased real depth of frost. (5) The ratio of heaving to depth of frost increased as water uptake at freezing became larger, decreasing with dry density. (6) The larger the water uptake at freezing, the larger the water content in the frozen upper layer. The water content in freezing front was related to dry density and became smaller than the content in the unfrozen lower layer to some extent. (7) Clay expressed neither heaving nor water uptake and shrank a little. (8) Mixture of volcanic ash soil with clay decreased heaving. This resulted in increasing dry density.
帯広畜産大学の論文
1977-07-25

突固め火山灰土の凍上に関する研究 : 第2報乾燥密度と凍上

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突固め火山灰土の凍上に関する研究 : 第2報 乾燥密度と凍上

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突固め火山灰土の凍上に関する研究 : 第2報乾燥密度と凍上