Geomechanics and Engineering

  • 제18권2호
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  • Pages.215-224
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  • 2019
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

An overview of several techniques employed to overcome squeezing in mechanized tunnels; A case study

  • Eftekhari, Abbas (Department of Mining Engineering, Faculty of Engineering, University of Kashan) ;
  • Aalianvari, Ali (Department of Mining Engineering, Faculty of Engineering, University of Kashan)
  • 투고 : 2018.12.22
  • 심사 : 2019.05.28
  • 발행 : 2019.06.10
⟨ 이전 논문 다음 논문 ⟩

초록

Excavation of long tunnels by shielded TBMs is a safe, fast, and efficient method of tunneling that mitigates many risks related to ground conditions. However, long-distance tunneling in great depth through adverse geological conditions brings about limitations in the application of TBMs. Among various harsh geological conditions, squeezing ground as a consequence of tunnel wall and face convergence could lead to cluttered blocking, shield jamming and in some cases failure in the support system. These issues or a combination of them could seriously hinder the performance of TBMs. The technique of excavation has a strong influence on the tunnel response when it is excavated under squeezing conditions. The Golab water conveyance tunnel was excavated by a double-shield TBM. This tunnel passes mainly through metamorphic weak rocks with up to 650 m overburden. These metamorphic rocks (Shales, Slates, Phyllites and Schists) together with some fault zones are incapable of sustaining high tangential stresses. Prediction of the convergence, estimation of the creeping effects and presenting strategies to overcome the squeezing ground are regarded as challenging tasks for the tunneling engineer. In this paper, the squeezing potential of the rock mass is investigated in specific regions by dint of numerical and analytical methods. Subsequently, several operational solutions which were conducted to counteract the challenges are explained in detail.

키워드

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피인용 문헌

  1. Estimation of the excavation damage zone in TBM tunnel using large deformation FE analysis vol.24, pp.4, 2019, https://doi.org/10.12989/gae.2021.24.4.323