|Table of Contents|

Influence of deep foundation pit construction on adjacent subway tunnel deformation and parameter sensitivity analysis(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年4期
Page:
63-72
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Influence of deep foundation pit construction on adjacent subway tunnel deformation and parameter sensitivity analysis
Author(s):
HE Zhong-ming1;  WANG Pan-pan1;  WANG Li-jun2;  QIU Jun-jun3
(1. School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China; 2. Guangzhou Metro Group Co. Ltd, Guangzhou 510380, Guangdong, China; 3. Ganzhou Urban Investment Group Co. Ltd, Ganzhou 341000, Jiangxi, China)
Keywords:
tunnel engineering;  deep foundation pit;  tunnel deformation;  sensitivity analysis;  numerical simulation;  underground diaphragm wall
PACS:
U451.5
DOI:
10.19721/j.cnki.1671-8879.2022.04.007
Abstract:
In order to study the influence of deep foundation pit excavation, backfill and support structure parameters on the deformation of the adjacent subway tunnel and underground diaphragm wall, based on the foundation pit project of Guangzhou Metro Line 11, and the finite difference software FLAC3D was used to analyze the deformation law of the adjacent subway tunnel and underground diaphragm wall during the excavation and backfilling of the foundation pit precipitation. The effects of support stiffness, burial depth, and thickness of diaphragm wall on the maximum horizontal displacement of a diaphragm wall, and maximum horizontal and vertical displacement index of a subway tunnel were studied by an orthogonal test method. The influence of various factors on the stability indexes was analyzed and determined. The results show that with the development of the pit construction, the horizontal displacement of the underground diaphragm wall gradually increases and the position of the maximum horizontal displacement gradually moves down from the top. The horizontal displacement curve of the underground diaphragm wall is a parabola, and the values in the middle of the parabola are relatively large and the values at the two ends are relatively small. With the development of pit construction, the horizontal displacement curve of the subway tunnel becomes more and more prominent. The horizontal displacement of the subway tunnel is larger in the range of the pit. The maximum horizontal displacement is 8.55 mm, which is located in the middle of the subway tunnel near the pit side. During the construction of the foundation pit, the maximum settlement of the subway tunnel is 3.76 mm, which is located in the middle of the subway tunnel near the side of the foundation pit. The maximum horizontal displacement of the underground diaphragm wall at the completion of construction is about 50% higher than the underground diaphragm wall at the completion of excavation. When using the extreme difference method, the extreme value of the mean value of the maximum deformation of each stability index under the action of factor Ⅲ(support stiffness)is the largest, and the effect of the support stiffness parameter on the deformation of the diaphragm wall and the subway tunnel is the most significant. The results of the ANOVA also indicate that the influence of the support stiffness on the maximum horizontal displacement of underground diaphragm wall and the subway tunnel is the most significant. The design of similar pits in the same area should focus on the design of the support structure.10 tabs, 11 figs, 25 refs.

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Last Update: 2022-07-20