Numerical Analysis of Landslide Prevention Piles: Comparisons between the Conventional Design Method and the Elasto-Plastic Finite Element Method.

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Other Title
  • 地すべり抑止杭の解析　　現行設計法と弾塑性ＦＥＭの比較
  • ヂスベリ ヨクシ クイ ノ カイセキ ゲンコウ セッケイホウ ト ダン ソセイ FEM ノ ヒカク
  • Comparisons between the Conventional Design Method and the Elasto-Plastic Finite Element Method
  • 現行設計法と弾塑性FEMの比較

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Description

The behavior characteristics of flexible piles in landslides are simulated with a three-dimensional elasto-plastic finite element model where the sliding layer is incrementally driven by prescribed uniform boundary displacements. For many landslides, some part of the movement of sliding layer is not included in the observed value because measurements are started after the move-ment occurred. This partial movement is produced by antecedent boundary displacements. The influences of the shear strength of the sliding surface, antecedent boundary displacements, and pile spacing, Poisson's ration and the dilatancy of the sliding layer on the pile behavior characteristics are analyzed. The numerical comparisons show that the pile spacing and the shear strength of the sliding surface have significantly influences on the profile of the bending moment and shear force of the piles in landslides. The conventional design method based on the subgrade reaction solution gives smaller deflection of pile head and the bending moment of piles, and then make the piles in some dangerous side. The calculated pressure on the piles concentrates around the sliding surface, and this is similar to the assumption used in the conventional design method. Poisson's ratio and the dilatancy of the sliding layer have not significantly influence on the pile behaviors.

Journal

  • Landslides

    Landslides 38 (2), 123-128, 2001

    The Japan Landslide Society

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