期刊
ENGINEERING GEOLOGY
卷 195, 期 -, 页码 42-52出版社
ELSEVIER
DOI: 10.1016/j.enggeo.2015.04.028
关键词
Tunnel; Pre-reinforcement; Face bolting; Umbrella; Numerical simulation; Stress release
Full-face excavation associated with ground reinforcement is a common technique to build large tunnels in soft rock or hard soil. The phenomenon of the interaction between the excavation process, the reinforcements and the ground reaction is a three-dimensional (3D) problem. Currently, software and hardware developments provide the option of a numerical analysis of a 3D tunnel excavation within a reasonable calculation time; however, twodimensional calculations based on the simplified convergence-confinement method are still the most common approach of engineers in current projects during the design phase. This study presents the numerical back-analysis of a monitoring section setup in the southern Toulon tunnel in France. The primary goal of this study was to investigate and compare the ability of the two numerical approaches (i.e., 2D and 3D) to reproduce the real behaviour of the tunnel measured in situ. The 3D calculation correctly simulates the in situ data, confirming that this tool can represent the complexity of a tunnel excavation. Fitting the 2D calculations onto the 3D results also enabled the determination of the stress release values corresponding to the real excavation process adopted in the Toulon project. This analysis produces two-dimensional numerical results that are globally satisfactory, considering the ground displacement. (C) 2015 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据