| 講演要旨(和文) | | 昨年度報告した木津川、紀ノ川に続いて、本年度は由良川および木曾川において堤防探査を実施した。これらの堤防から採取した土質試料を用いて飽和度と電気比抵抗の関係を室内実験から求めたところ、砂礫土と中間土では大きな違いが見られた。いずれの土も飽和度が低い場合、数千ohmmの高い比抵抗値を示し、砂礫土との区別がつかない。中間土の同定のためには、電気探査の情報に地盤調査を追加する必要がある。 |
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| | 講演要旨(英文) | | Following the previous study at Kizu-River as well as Kinokawa-River, the electric survey was performed at embankments at Yura-river and Kiso-River. Soils at the four embankments were sampled. In the previous study, the intermediate soils are reported to show rather wider range of the electric resistance by field survey compared with the unified cone penetrating test in the field. Laboratory test to obtain relationship between relative saturation and electric resistance of soils. Intermediate soils show wide change of the resistance and difficult to identify soil type based upon only electric resistance. To identify soil type, it is necessary to perform some additional geotechnical borings in addition with the electric survey. |
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