Three-dimensional numerical simulation of mechanized twin stacked tunnels in soft ground

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• 作者：Ngoc-Anh Do (1) (4)
  Daniel Dias (2)
  Pierpaolo Oreste (3)
  
• 关键词：3D modelling ; Stacked tunnels ; Segmental tunnel lining ; Lining response ; Surface settlement ; Tunnel support ; U451 ; 涓夌淮妯″瀷 ; 閲嶅彔闅ч亾 ; 娈甸毀閬撹‖鐮?/li> 琛爩鍝嶅簲 ; 鍦伴潰娌夐檷 ; 闅ч亾鏀姢
• 刊名：Journal of Zhejiang University - Science A
• 出版年：2014
• 出版时间：November 2014
• 年：2014
• 卷：15
• 期：11
• 页码：896-913
• 全文大小：2,039 KB
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• 作者单位：Ngoc-Anh Do (1) (4)
  Daniel Dias (2)
  Pierpaolo Oreste (3)
  
  1. Laboratory LGCIE, INSA of Lyon, University of Lyon, Villeurbanne, France
  4. Faculty of Civil Engineering, Department of Underground and Mining Construction, Hanoi University of Mining and Geology, Hanoi, Vietnam
  2. Laboratory LTHE, Grenoble Alpes University, Grenoble, France
  3. Department of Environmental, Land and Infrastructural Engineering, Politecnico of Torino, Torino, Italy
  
• ISSN：1862-1775

文摘

The increase in transportation in large cities has made it necessary to construct twin tunnels at shallow depths. As far as the parallel excavation of mechanized twin tunnels is concerned, most of the cases reported in previous studies have focused on the interactions between two horizontally driven tunnels. However, less work has been devoted to the interactions between tunnels stacked over each other. The numerical investigation performed in this study has made it possible to evaluate the influence of the construction process on two stacked tunnels, using the FLAC3D finite difference element software. The structural forces induced in each of the stacked tunnels and the displacements in the surrounding ground have been highlighted. The results of the numerical analysis indicate that new tunnel construction can have a great impact on an existing tunnel. The greatest impacts are observed when the upper tunnel is excavated first. The excavation of the upper tunnel generally leads to greater surface settlements than when the lower tunnel is excavated first. This study also shows that the normal forces induced in the lower tunnel are always greater than those developed in the upper tunnel. The normal displacements and the bending moments induced in the lower tunnel are usually smaller than those in the upper tunnel.