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首页> 外文学位 >Back analysis of a tunnelling case study in weak rock of the Alpine system in Northern Greece: Validation and optimization of design analysis based on ground characterization and numerical simulation.
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Back analysis of a tunnelling case study in weak rock of the Alpine system in Northern Greece: Validation and optimization of design analysis based on ground characterization and numerical simulation.

机译：希腊北部高山系统弱岩隧道掘进案例研究的反分析：基于地面特征和数值模拟的设计分析的验证和优化。

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摘要

The backdrop for this thesis is the tunnelling that is currently nearing completion in the Epirus region of Northern Greece, as part of the Egnatia Odos Highway construction. Highly deformed and altered sediments and low grade rock masses dominate the near surface environment creating a variety of technical challenges for tunnelling. Accurate equivalent rock mass performance reductions for tunnels in these materials are complicated by geomorphologic peculiarities such as those found in Flysch materials. The mechanisms of rock-support interaction related to face or near-face reinforcement systems are poorly understood at this time. As well, the mechanics of weak rock materials in the complex deformation regime in advance of a tunnel face are not robustly integrated into current 2D design models. Design decisions are currently possible using empirical techniques and simplified models, but a true optimized and mechanics-based design process for the various support technologies is not fully developed. This research addresses elements of such issues, such as: use of the Longitudinal Displacement Profile (LDP) of the Convergence-Confinement method of tunnel design, relating 2D numerical models to their distance from the face using the size of the plastic zone as an indicator, near face tunnel support analysis in weak rock masses, boundary condition assessment for numerical modelling of such weak rock masses, the influence of plasticity zones surrounding tunnel excavations, and modelling optimization techniques for weak rock tunnelling in order to optimize the design of such underground structures and better predict near-face deformation and yield development. This work involved the use of 2D and 3D numerical models of tunnel sequencing for numerical simulation of composite material behaviour and sequential tunnel deformation response.
机译：本文的背景是作为Egnatia Odos高速公路建设的一部分，希腊北部伊庇鲁斯地区的隧道正在接近完工。高度变形和改变的沉积物以及低品位岩体主导着近地表环境，从而为隧道技术带来了各种技术挑战。这些材料中隧道的等效当量岩石质量性能的降低由于诸如Flysch材料中的地貌特征而变得复杂。目前，人们对与面部或近面部加固系统有关的岩-岩相互作用的机理了解甚少。同样，在隧道工作面之前的复杂变形区域中的弱岩石材料力学也没有牢固地集成到当前的2D设计模型中。当前可以使用经验技术和简化模型来进行设计决策，但是针对各种支持技术的真正优化和基于机械原理的设计过程尚未完全开发出来。这项研究解决了这些问题的要素，例如：使用隧道设计的收敛约束法的纵向位移剖面（LDP），将2D数值模型与它们到工作面的距离相关联，并使用塑料区域的大小作为指标，弱岩体的近壁隧道支护分析，对这类弱岩体的数值模拟的边界条件评估，隧道开挖可塑性区的影响以及弱岩隧道的建模优化技术，以优化此类地下结构的设计并更好地预测近表面变形和屈服发展。这项工作涉及将隧道排序的2D和3D数值模型用于复合材料行为和顺序隧道变形响应的数值模拟。

著录项

  • 作者

    Vlachopoulos, Nicholas.;

  • 作者单位

    Queen's University (Canada).;

  • 授予单位 Queen's University (Canada).;
  • 学科 Geotechnology.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 562 p.
  • 总页数 562
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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