The Model Experiments and Finite Element Analysis on Deformation and Failure by Excavation of Grounds in Foregoing-roof Method

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  • 先受ルーフ工法における横掘削による地盤の変形・破壊問題に関する模型実験と有限要素解析
  • サキウケルーフ コウホウ ニ オケル ヨコ クッサク ニ ヨル ジバン ノ ヘンケイ ハカイ モンダイ ニ カンスル モケイ ジッケン ト ユウゲン ヨウソ カイセキ

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Abstract

We propose the trenchless box culvert construction method to construct box culverts in small covering soil layers while keeping roads or tracks open. When we use this construction method, it is necessary to clarify deformation and shear failure by excavation of grounds. In order to investigate the soil behavior, model experiments and elasto-plactic finite element analysis were performed. In the model experiments, it was shown that the shear failure was developed from the end of the roof to the toe of the boundary surface. In the finite element analysis, a shear band effect was introduced. Comparing the observed shear bands in model experiments with computed maximum shear strain contours, it was found that the observed direction of the shear band could be simulated reasonably by the finite element analysis. We may say that the finite element method used in this study is useful tool for this construction method.

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