| 講演要旨(和文) | | 本研究では、内陸谷埋め方式の廃棄物処分場における不飽和浸透流(水みち)の可視化に向けて、特に模擬埋立層を対象とした電気探査(室内実験)を行った。埋立層表層の一定点から一定量の注水を行える装置を作成し、内陸谷埋め方式の処分場における注水状態を模擬的に再現した。埋立層内への注水を行うと同時に、同一条件にて一定間隔で電気探査を繰り返し実施し、廃棄物埋立層内の比抵抗プロファイルの取得と比抵抗変化率プロファイルを作成した。比抵抗変化率プロファイルを時系列で比較することで、比抵抗の低下が大きいゾーンが同心円状に広がっていく様子が観測できた。この結果に基づいて土質試験を行った結果、比抵抗の低下が見られるゾーンは比較的透水性がよいことが確認された。このことから埋立層内の比抵抗の低下は浸透水の流動に起因するものであり、廃棄物埋立層内における不飽和浸透流を電気探査比抵抗法で把握可能であることが確かめられた。 |
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| | 講演要旨(英文) | | We measured resistivity in a laboratory setting fill model and in a landfill to make clear the water path. The paper covers the results of the laboratory experiment. We prepared a simulated fills consisting mainly of incinerator ash in a rectangular tank. The resistivity prospecting method was applied to the fills. The following is the main results of this study. (1) We poured water into the simulated landfills and measured resistivity repeatedly at ten minute intervals. Three dimensional inverse analysis was applied to the apparent resistivity data and 3-D profiles were obtained. Differential profiles were also calculated. As a result, we could detect that the decreasing zone of resistivity was expanding concentrically. (2) We took some undisturbed core samples from the fills and measured the hydraulic conductivity. The zone that changes remarkably in resistivity has relatively high water permeability.From these results, we can visualize the water path clearly using resistivity measurement. |
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