材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
論文
土の吸水走査曲線とその表現方法について
中村 聡司日置 和昭
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ジャーナル フリー

2020 年 69 巻 11 号 p. 829-836

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Herein, we perform an unsaturated seepage test on four soil types with different fine fraction contents and investigate various methods for expressing the wetting scanning curve of soil. The results confirmed that 1) the natural maximum saturation Smax for the target soil is approximately 60%–90%, and the lower the saturation before water absorption Sr0, the lower the natural maximum saturation Smax; 2) when expressing the unsaturated seepage characteristics of the soil (main drying curve and wetting scanning curve) using van Genuchten model, there exists a relation (αsw≒2αmd ) between the wetting scanning curve constant αsw and main drying curve constant αmd; furthermore, the relation (nswnmd) exists between the wetting scanning curve constant nsw and main drying curve constant nmd; and 3) the natural maximum saturation Smax can be expressed with almost perfect precision using Land method; moreover, this can easily be estimated from the saturation before water absorption Sr0.

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