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Study on the 3 dimensional numerical analysis method for shield TBM tunnel considering key factors

주요 영향요소를 고려한 쉴드TBM 터널 3차원 수치해석기법 연구

  • Jun, Gy-chan (Research Institute Dept., KOREA Engineering & Construction Co., Ltd.) ;
  • Kim, Dong-hyun (Research Institute Dept., KOREA Engineering & Construction Co., Ltd.)
  • 전기찬 (대한건설엔지니어링 기술연구소) ;
  • 김동현 (대한건설엔지니어링 기술연구소)
  • Received : 2018.02.19
  • Accepted : 2018.03.06
  • Published : 2018.03.31

Abstract

A 3 dimensional numerical analysis for shield TBM tunnel should take into account various characteristics of the shield TBM excavation, such as gap, tail void, segment installation, and backfill injection. However, analysis method considering excavation characteristics are generally mixed with various method, resulting in concern of consistency and reliability degradation of the analytical results. In this paper, a parametric study is carried out by using actually measured ground settlement data on various methods that can be used for 3 dimensional numerical analysis of shield TBM tunneling. As a result, we have analyzed and arranged an analytical method to predict similarly the behavior of ground settlement and tunnel face pressure at the design stage. Skin plate pressure, backfill pressure and soil model have been identified as the most significant influences on the ground settlement. The grout pressure model is considered to be applicable when there is no volume loss information on the excavated ground, such as seabed tunnels, or when it is important to identify the behavior around a tunnel, such as surface settlement as well as face pressure. And it is considered that designers can use these guidelines as a base material to perform a reasonable 3 dimensional numerical analysis that reflects the ground conditions and the features of the shield TBM tunneling.

Acknowledgement

Grant : Development of Key Subsea Tunnelling Technology

Supported by : Korea Agency for Infrastructure Technology Advancement

References

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