Geomechanics and Engineering

  • 제13권4호
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  • Pages.671-683
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  • 2017
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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

Combination of engineering geological data and numerical modeling results to classify the tunnel route based on the groundwater seepage

  • Aalianvari, A. (Mining Engineering Department, Faculty of Engineering, University of Kashan)
  • 투고 : 2016.12.10
  • 심사 : 2017.04.29
  • 발행 : 2017.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

Groundwater control is a significant issue in most underground construction. An estimate of the inflow rate is required to size the pumping system, and treatment plant facilities for construction planning and cost assessment. An estimate of the excavation-induced drawdown of the initial groundwater level is required to evaluate potential environmental impacts. Analytical and empirical methods used in current engineering practice do not adequately account for the effect of the jointed-rock-mass anisotropy and heterogeneity. The impact of geostructural anisotropy of fractured rocks on tunnel inflows is addressed and the limitations of analytical solutions assuming isotropic hydraulic conductivity are discussed. In this paper the unexcavated Zagros tunnel route has been classified from groundwater flow point of view based on the combination of observed water inflow and numerical modeling results. Results show that, in this hard rock tunnel, flow usually concentrates in some areas, and much of the tunnel is dry. So the remaining unexcavated Zagros tunnel route has been categorized into three categories including high Risk, moderately risk and low risk. Results show that around 60 m of tunnel (3%) length can conduit the large amount of water into tunnel and categorized into high risk zone and about 45% of tunnel route has moderately risk. The reason is that, in this tunnel, most of the water flows in rock fractures and fractures typically occur in a clustered pattern rather than in a regular or random pattern.

키워드

참고문헌

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피인용 문헌

  1. Analysis of the crack propagation rules and regional damage characteristics of rock specimens vol.24, pp.3, 2017, https://doi.org/10.12989/gae.2021.24.3.215
  2. Quantitative assessment on the reinforcing behavior of the CFRP-PCM method on tunnel linings vol.25, pp.2, 2021, https://doi.org/10.12989/gae.2021.25.2.123