Estimation of the excavation damage zone in TBM tunnel using large deformation FE analysis

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.24.4.323
Dohyun Kim, Sangseom Jeong
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引用次数: 3

Abstract

This paper aims to estimate the range of the excavation damaged zone (EDZ) formation caused by the tunnel boring machine (TBM) advancement through dynamic three-dimensional large deformation finite element analysis. Large deformation analysis based on Coupled Eulerian-Lagrangian (CEL) analysis is used to accurately simulate the behavior during TBM excavation. The analysis model is verified based on numerous test results reported in the literature. The range of the formed EDZ will be suggested as a boundary under various conditions – different tunnel diameter, tunnel depth, and rock type. Moreover, evaluation of the integrity of the tunnel structure during excavation has been carried out. Based on the numerical results, the apparent boundary of the EDZ is shown to within the range of 0.7D (D: tunnel diameter) around the excavation surface. Through series of numerical computation, it is clear that for the rock of with higher rock mass rating (RMR) grade (close to 1st grade), the EDZ around the tunnel tends to increase. The size of the EDZ is found to be direct proportional to the tunnel diameter, whereas the depth of the tunnel is inversely proportional to the magnitude of the EDZ. However, the relationship between the formation of the EDZ and the stability of the tunnel was not found to be consistent. In case where the TBM excavation is carried out in hard rock or rock under high confinement (excavation under greater depth), large range of the EDZ may be formed, but less strain occurs along the excavation surface during excavation and is found to be more stable.
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基于大变形有限元分析的TBM隧道开挖损伤区估算
本文旨在通过动态三维大变形有限元分析,估算隧道掘进机掘进造成的开挖损伤区形成范围。采用基于耦合欧拉-拉格朗日(CEL)分析的大变形分析方法,对隧道掘进机开挖过程进行了精确模拟。基于大量文献报道的试验结果对分析模型进行了验证。在不同的条件下——不同的隧道直径、隧道深度和岩石类型——形成的EDZ范围将被建议作为边界。并对开挖过程中隧道结构的完整性进行了评价。数值计算结果表明,EDZ的视边界在开挖面周围0.7D (D:隧道直径)范围内。通过一系列数值计算可知,对于RMR等级较高(接近1级)的岩石,隧道周围的EDZ有增大的趋势。EDZ的大小与隧道直径成正比,而隧道深度与EDZ的大小成反比。然而,EDZ的形成与隧道稳定性之间的关系并不一致。在硬岩或高约束条件下(较深开挖)开挖时,可能形成较大范围的EDZ,但开挖过程中沿开挖面产生的应变较小,更加稳定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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