|Table of Contents|

Study on influence of soil loading and unloading and foundation pit excavation superposition on existing tunnel deformation(PDF)

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

Issue:
2023年01期
Page:
142-149
Research Field:
基础工程
Publishing date:

Info

Title:
Study on influence of soil loading and unloading and foundation pit excavation superposition on existing tunnel deformation
Author(s):
GUO Yuancheng1;  ZHANG Bowen1;  MENG Chao1; 2;  JIN Junwei1;  GAO Xinjun1
(1. School of Hydraulic and Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China; 2. Zhengzhou Branch, Huadian Heavy Industries Co., Ltd., Zhengzhou 450009, Henan, China)
Keywords:
subway tunnel;  deformation;  foundation pit excavation;  numerical simulation;  soil loading and unloading;  superposition effect
PACS:
TU92
DOI:
10.19815/j.jace.2021.08010
Abstract:
Considering the problem of large deformation of existing subway tunnel caused by the superposition effect of soil loading and unloading and foundation pit excavation, a three-dimensional spatial analysis model was established by considering the influence of loading and unloading superposition effect. The influence of different superposition modes of soil stacking loading and unloading and foundation pit excavation on the deformation law of the tunnel was studied, and the deformation laws of tunnel under soil loading, unloading and foundation pit excavation were analyzed. The results show that the influence of soil loading and unloading above the tunnel has a great influence on the vertical displacement of the tunnel, and the influence of soil loading and unloading on the tunnel vertical displacement is 3 to 5 times of that on the side. After the loading and unloading, the residual deformation of the tunnel cannot be ignored, and the residual vertical displacement is about 62% of the displacement after loading. The excavation depth has a great influence on the deformation of the tunnel when the soil loading and unloading is superimposed on the excavation of the side foundation pit. When the excavation depth exceeds the buried depth of the tunnel, the deformation of the tunnel will develop in a more unfavorable direction. Among the four superposition modes, the final vertical displacement of the tunnel from the loading and unloading of soil directly above to the excavation and unloading of side foundation pit is the largest, about 17 mm, and the final horizontal displacement of the tunnel from the soil loading and unloading laterally to the excavation and unloading of foundation pit on the opposite side is the largest, about 8 mm. The influence of superposition effect should be fully considered during the construction of adjacent tunnels to avoid these two situations as far as possible.

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Last Update: 2023-01-01