|Table of Contents|

Influence of Construction Sequence of Parallel Curved Tunnels on Existing Tunnels in Soft Soil Stratum(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年06期
Page:
170-176
Research Field:
软土隧道施工与变形控制
Publishing date:

Info

Title:
Influence of Construction Sequence of Parallel Curved Tunnels on Existing Tunnels in Soft Soil Stratum
Author(s):
DENG Bi1;  ZHANG Jun-wei2;  ZHUGE Xu-song3;  LIU Wen-xian4;  LIN Xing-tao1; 5; 6;  SU Dong1; 5; 6;  CHEN Xiang-sheng1; 5; 6
(1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China; 2. China Railway 15 Bureau Group Co., Ltd., Shanghai 200070, China; 3. Zhuhai Dahengqin City New Center Development Co., Ltd., Zhuhai 519030, Guangdong, China; 4. Zhuhai Institute of Urban Planning and Design,Zhuhai 519000, Guangdong, China;
Keywords:
soft soil stratum;  curved tunnel;  construction sequence;  radius of curvature;  structural internal force
PACS:
TU43
DOI:
10.19815/j.jace.2021.08048
Abstract:
To study the influence of the construction sequence of parallel curved tunnels, a three-dimensional finite element numerical model was established according to the Mangzhou tunnel project in Hengqin. On the basis, the deformation of existing tunnel induced by the new curved shield tunnelling was investigated under different construction sequences and radii of curvature r(r=500, 800 m). The results show that the construction sequence has a small effect on the existing tunnel displacement, while the radius of curvature has a relatively large effect on the existing tunnel displacement, which increases by about 15% with the increasing of the radius of curvature(r=500-800 m). The existing tunnel displacements mainly occur within 2D(D is the tunnel outer diameter)in front of the shield excavation face and 1D behind it. The effect of the construction sequence on the internal forces of the existing tunnel is related to the radius of curvature. For a radius of curvature of 500 m, the construction sequence has a similar effect on the internal forces of the existing tunnel as the existing tunnel profile closest to the shield excavation produces the largest bending moment, and both the maximum and minimum bending moments occur close to the new tunnel side. The bending moment(absolute value)in the existing tunnel is smaller when the inner tunnel is excavated firstly, making it safer to excavate the inner tunnel firstly for parallel curved tunnel construction. The greatest axial forces are generated in the existing tunnel at a certain distance in front of the shield excavation face. The double-line tunnel with radius of curvature of 800 m is approximately similar to parallel tunnel and the construction sequence has a small effect on the variation and magnitude of the internal forces of the existing tunnel.

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Last Update: 2021-11-01