FEMを用いた斜面安定解析法と切土斜面の崩壊メカニズムの検討 A New Slope Stability Analysis Method Based on FEM and Discussion on a Failure Mechanism of a Cut Slope

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論文前半ではFEMを用いた斜面安定解析法を提案し, その妥当性をモデル斜面で検証した。得られた安全率はBishop法, Janbu・1/3法と同等の値を得た。後半では, FEM応力解析と斜面安定解析を併せ用いて橋梁基礎の切土斜面の崩壊原因を検討した。その結果, 基礎の荷重による応力集中域のせん断強度が, 降雨浸透や乾湿繰返しを受けて劣化し, 降雨が契機となって崩壊したものと推定した。また, 斜面の安定化対策工についても検討した。

A new slope stability analysis method based on FEM (SS-Method) is presented. Here normal and shear stresses acting on the middle point 'A' of an arc of a slip surface within an individual element were calculated by employing the Shape-Matrix technique. In order to evaluate the accuracy of the SS-Method, a "standard slope", which was assigned a safety factor of unity on the critical slip surface, was utilized. The safety factor of the critical slip surface obtained from the SS-Method was 1.01, verifying the reliability of this method.<BR>Safety factors for three test slopes calculated using the SS-method fell within valves obtained from other popular slope stability analysis methods.<BR>Two slope failures occurred in a cut soft-rock slope under a road bridge foundation. One of which was analyzed with a new approach, where slope stability was estimated by combining both the SS-Method (safety factor on critical slip surface) and FEM-stress method (local safety factor). The failure mechanism is explained as follows: The foundation caused a concentration of stresses near its toe, and subsequently a shearing deformation occurred in the slope due to deterioration of strength after several rainfalls. The slope failures were finally triggered due to a heavy rainfall.<BR>Countermeasures of the slope are also discussed by employing the FEM-stress method. Construction of an anchored framework or a simple frame-work are suggested.

収録刊行物

  • 地すべり

    地すべり 38(2), 129-135, 2001-09-25

    The Japan Landslide Society

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各種コード

  • NII論文ID(NAID)
    10013011260
  • NII書誌ID(NCID)
    AN00332562
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    02852926
  • NDL 記事登録ID
    6354261
  • NDL 雑誌分類
    ZM49(科学技術--地球科学--地質)
  • NDL 請求記号
    Z15-405
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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