BASIC STUDY ON THE FLOOR HEAVE AND ITS COUNTERMEASURES OF THE MOUNTAIN TUNNELS

DOI Web Site 3 Citations 2 References
  • KOBAYASHI Hiroaki
    （独）鉄道建設・運輸施設整備支援機構 大阪支社
  • IURA Tomomi
    （独）鉄道建設・運輸施設整備支援機構 九州新幹線建設局
  • UENO Hikaru
    （独）鉄道建設・運輸施設整備支援機構 設計技術部
  • WATANABE Kazuyuki
    （独）鉄道建設・運輸施設整備支援機構 設計技術部
  • SHIMAMOTO Keisuke
    （公財）鉄道総合技術研究所 構造物技術研究部
  • ITO Naoki
    （公財）鉄道総合技術研究所 構造物技術研究部

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Other Title
  • 山岳トンネルの盤ぶくれとその対策に関する基礎的研究

Description

Some mountain tunnels suffer from floor heave after completion, and some of them require countermeasures. This phenomenon occurs if there are no big deformation during construction, therefore, under existing circumstances, based on preliminary survey and condition of excavation, to predict the floor heave deformation after completion is difficult.<br> In this study, to help the improvement of the prediction accuracy, first, construction data of Shinkansen tunnels suffered from floor heave were analyzed, so that the concernment between deterioration of ground by water and floor heave was confirmed. Second, make the model ground using the rock of actual tunnel, and recreate the floor heave by adding the water to model ground. Finally, tunnel excavation and floor heave after construction are consistently modeled in the numerical analysis. As the result, the effect of early closure and invert shape for floor heave were confirmed.

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