EXCAVATION MANAGEMENT INDEX FOR DUAL MODE TBM OF SLURRY TYPE AND EARTH-PRESSURE BALANCE TYPE IN COLLAPSIBLE SANDY GROUND

DOI Web Site 2 References
  • IZUMO Rikito
    東京電力パワーグリッド株式会社 工務部 送変電建設センター 千葉印西管路新設グループ
  • MAEHARA Kenji
    東京電力パワーグリッド株式会社 工務部 送変電建設センター 千葉印西管路新設グループ
  • YOSHIMOTO Masahiro
    東京電力パワーグリッド株式会社 工務部
  • NAGAMITSU Kenichiro
    大成建設株式会社 関西支店 門真守口シールド第2工区作業所
  • Mori Makoto
    大成建設株式会社 本社土木設計部
  • HIRONO Aya
    大成建設株式会社 千葉支店 東電印西シールド作業所

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Other Title
  • 崩壊性の高い砂地盤における泥水泥土複合式シールド工法の掘進管理指標

Abstract

<p> In a situation where social attention is focusing on a sinkhole caused by tunnel construction works, we constructed the TBM tunnel with high advance rate in a highly collapsible sandy ground. In this construction, we adopted the Dual Mode TBM which is a combined Slurry & EPB type TBM that can be switched to either of the mode as needed, to achieve both the TBM face pressure stability and high-speed construction. However, an appropriate index for switching between two modes has not been established. Therefore, in this construction, we controlled the TBM parameters based on the provisional indicators, analyzed the data obtained from the construction results, and carried out the construction by reflecting it to the subsequent construction. In this paper, we have implemented a series of countermeasures for the Dual Mode TBM to achieve both face stability and high-speed construction and proposed an excavation management index.</p>

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