Journal of Zhejiang University

Journal of Zhejiang University SCIENCE A 2014 Vol.15 No.11 P.896-913

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

Author(s): Ngoc-Anh Do^1,4,Daniel Dias²,Pierpaolo Oreste³
Affiliation(s): 1. 1. Laboratory LGCIE, INSA of Lyon, University of Lyon, Villeurbanne, France more
Corresponding email(s): daniel.dias@ujf-grenoble.fr
Key Words: 3D modelling, Stacked tunnels, Segmental tunnel lining, Lining response, Surface settlement, Tunnel support

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Ngoc-Anh Do, Daniel Dias, Pierpaolo Oreste. Three-dimensional numerical simulation of mechanized twin stacked tunnels in soft ground[J]. Journal of Zhejiang University Science A, 2014, 15(11): 896-913.

@article{title="Three-dimensional numerical simulation of mechanized twin stacked tunnels in soft ground",
author="Ngoc-Anh Do, Daniel Dias, Pierpaolo Oreste",
journal="Journal of Zhejiang University Science A",
volume="15",
number="11",
pages="896-913",
year="2014",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1400117"
}

%0 Journal Article
%T Three-dimensional numerical simulation of mechanized twin stacked tunnels in soft ground
%A Ngoc-Anh Do
%A Daniel Dias
%A Pierpaolo Oreste
%J Journal of Zhejiang University SCIENCE A
%V 15
%N 11
%P 896-913
%@ 1673-565X
%D 2014
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1400117

TY - JOUR
T1 - Three-dimensional numerical simulation of mechanized twin stacked tunnels in soft ground
A1 - Ngoc-Anh Do
A1 - Daniel Dias
A1 - Pierpaolo Oreste
J0 - Journal of Zhejiang University Science A
VL - 15
IS - 11
SP - 896
EP - 913
%@ 1673-565X
Y1 - 2014
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1400117

Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: 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 FLAC^3D 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.

软土地面中机械化双叠隧道的三维数值模拟

通过三维数值模拟，研究隧道施工过程对双叠隧道的影响。使用全三维数值模拟方法研究软土中双叠隧道施工对先挖隧道或地面的影响。 1. 运用FLAC软件创建双叠隧道的三维数值模型（图1）；2. 分情况模拟机械化双叠隧道的挖掘过程；3. 研究不同情况下的地面沉降，水平地面位移，以及隧道衬砌的法向位移、法向力、纵向力和弯曲力矩等。 1. 新隧道施工对现有的隧道有很大的影响，最大影响出现在先挖上层隧道的情况下；2. 一般来说，上层隧道的挖掘会比下层隧道产生更大的地面沉降；3. 下层隧道产生的法向力总是比上层隧道大；4. 在多数情况下，下层隧道产生的法向位移和弯曲力矩要比上层隧道小。
三维模型；重叠隧道；段隧道衬砌；衬砌响应；地面沉降；隧道支护