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Assessment of tunnel portal stability at jointed rock mass: A comparative case study

机译：节理岩体隧道洞口稳定性评估：比较案例研究

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摘要

This paper presents results of a comparative numerical model study at a highway tunnel in Turkey. The tunnel was opened in a sandstone-siltstone rock mass having clear systematic discontinuity sets. In practice, effects of discontinuities of rock mass on tunnel stability are usually disregarded in finite element (FE) models, which are widely used for design of underground structures. To compensate this deficiency, rock masses' geotechnical properties are reduced to simulate effect of discontinuities in FE models. Main objective of this study is to show the effect of systematic and persistent discontinuity sets to FE numerical modeling when discontinuities exist. On this account, two different conditions were modeled to analyze stability conditions in a comparative manner. FE numerical analysis software "Phase~2 8.0" was used for modeling. Results have shown that presence of discontinuities have a significant effect on tunnel stability and model results when FEM software is used for discontinuum media. As a conclusion, in case of using FE numerical models without taking the discontinuities into account would definitively lead to erroneous results in assessing tunnel stability.
机译：本文介绍了土耳其高速公路隧道的比较数值模型研究结果。该隧道在具有明显系统不连续性集的砂岩-粉砂岩岩体中打开。在实践中，岩体不连续性对隧道稳定性的影响通常在有限元模型中被忽略，有限元模型被广泛用于地下结构的设计中。为了弥补这一不足，降低了岩体的岩土属性以模拟有限元模型中的不连续性影响。这项研究的主要目的是显示存在不连续性时，系统性和持续性不连续集对有限元数值模型的影响。因此，对两个不同的条件进行了建模，以比较的方式分析稳定性条件。使用有限元数值分析软件“ Phase〜2 8.0”进行建模。结果表明，当将FEM软件用于不连续介质时，不连续的存在对隧道稳定性和模型结果具有重大影响。结论是，在使用有限元数值模型而未考虑不连续性的情况下，将最终导致评估隧道稳定性的错误结果。

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  • 来源
    《Computers and Geotechnics》 |2015年第3期|72-82|共11页
  • 作者

    OEzguer Satici; Bahtiyar UEnver;

  • 作者单位

    General Directorate of Highways (GDH), Research & Development Department, Division of Geological Surveying, Chief of Geological Surveys, Ankara, Turkey ,Karayollan Genel Mueduerluegue, ARGE Dairesi Baskanligi, Vecdi Diker Egitim Tesisleri, Ankara, Turkey;

    Hacettepe University, Department of Mining Engineering, Ankara, Turkey;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Jointed rock mass; NATM; Numerical modeling; Tunnel portal;

    机译：节理岩体;NATM;数值建模;隧道门户;

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