2次元電気探査による地盤の亀裂範囲簡易推定手法  [in Japanese] Simplified Method for Detection of Open Crack Using 2-D Resistivity Survey  [in Japanese]

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Author(s)

    • 井上 敬資 INOUE Keisuke
    • 独立行政法人農業・食品産業技術総合研究機構 農村工学研究所 National Institute for Rural Engineering, National Agriculture and Food Research Organization
    • 中里 裕臣 NAKAZATO Hiroomi
    • 独立行政法人農業・食品産業技術総合研究機構 農村工学研究所 National Institute for Rural Engineering, National Agriculture and Food Research Organization

Abstract

地震等で発生した地盤の亀裂に,石灰水のような電解物質を注入し,亀裂に対して平行な測線および直交する測線で2次元電気探査を注入前後に行い,亀裂範囲を簡易に推定する手法を提案する.ここでは,亀裂範囲の推定に対して,2次元電気探査から得られる推定結果の特徴を数値実験により調べ,屋外試験においてその適用性を検討する.数値実験では,亀裂に平行な測線において,比抵抗変化がある水平範囲はモデル亀裂長さに対応した.亀裂に直交する測線においては,亀裂長さより亀裂深さが大きい場合は推定深さと実深さの相関は悪くなるが,亀裂長さより亀裂深さが小さい場合は,注入材料の深度方向への広がりを推定できることを明らかにした.屋外試験においても,亀裂の水平方向の広がりを推定できること,亀裂長さより亀裂深さが小さい場合は注入材料の深度方向への広がりを推定できることを確認した.以上の結果から,亀裂に平行な測線からその水平範囲を推定し,その結果に基づいて直交する測線から鉛直範囲を推定できることを示した.

A method using two-dimensional resistivity surveys was proposed to efficiently detect the range of cracks. In the method, a conductive liquid was injected into the cracks, resistivity surveys were performed before and after the injection and the distributions of changes in resistivity were calculated. To examine the applicability of this method in the fields, numerical and field examinations were conducted. In the numerical experiment, the horizontal range estimated by the survey line parallel to the crack was found to be almost equal to the actual crack length. The vertical range estimated by the survey line perpendicular to the crack had low correlation with the depth when the depth was larger than the length. However, high correlation was observed when the depth was smaller than half of the length. In the field experiments, the horizontal range estimated by the survey line parallel to the crack detected the crack length. The range of cracks, estimated by the survey line perpendicular to the cracks, detected the crack depth when the depth was smaller than the length. The results indicate the possibility of detecting the range of cracks by estimating the crack length based on parallel survey lines and the crack depth based on perpendicular survey lines.

Journal

  • Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 82(2), 101-111, 2014

    The Japanese Society of Irrigation, Drainage and Rural Engineering

Codes

  • NII Article ID (NAID)
    130005066447
  • NII NACSIS-CAT ID (NCID)
    AA12240517
  • Text Lang
    JPN
  • ISSN
    1882-2789
  • NDL Article ID
    025509941
  • NDL Call No.
    Z18-365
  • Data Source
    NDL  J-STAGE 
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