EVALUATION OF SHIELD TUNNELLING EFFECT ON STIFF GROUND BY FEA WITH DISPLACEMENT BOUNDARY INPUT

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  • SATO Yutaka
    社団法人 土木学会 (財) 鉄道総合技術研究所 構造物技術研究部
  • KONISHI Shinji
    社団法人 土木学会 (財) 鉄道総合技術研究所 構造物技術研究部
  • SUGIMOTO Mitsutaka
    社団法人 土木学会 長岡技術科学大学 環境・建設系
  • SRAMOON Aphichat
    社団法人 土木学会 長岡技術科学大学 環境・建設系

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  • 変位境界を用いた有限要素法によるシールド通過時における硬質地盤の挙動評価
  • ヘンイ キョウカイ オ モチイタ ユウゲン ヨウソホウ ニ ヨル シールド ツウカジ ニ オケル コウシツ ジバン ノ キョドウ ヒョウカ

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Abstract

Stress boundary has conventionally been used for the prediction of ground movement during shield tunneling in plain strain two-dimensional finite element analysis. In this study, based on excavated surface displacement boundary input, a ground displacement prediction method was proposed for shield tunneling. The results of the proposed method of 2D and 3D analysis were compared and evaluated with the field measurement. As a result, it was made clear that asymmetrical surrounding ground displacement during curve excavation was able to be simulated with the proposed method and it achieved more precise simulation than the conventional method by stress boundary input.

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