|Table of Contents|

Influence of Excavation of Zhengzhou Silt Foundation Pit on Underlying Subway Tunnel(PDF)

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

Issue:
2019年05期
Page:
11-20
Research Field:
Publishing date:

Info

Title:
Influence of Excavation of Zhengzhou Silt Foundation Pit on Underlying Subway Tunnel
Author(s):
GUO Yuan-cheng1; 2;  ZHAN Jing-yuan1;  DU Hao-ming3;  LI Ming-yu1; 2;  JIN Jun-wei1; 2;  MENG Chao1
(1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China; 2. Laboratory of Underground Engineering Safety and Quality Control of Henan Province, Zhengzhou University, Zhengzhou 450001, Henan, China; 3. Henan Provincial Communications Planning & Design Institute Co., Ltd., Zhengzhou 450052, Henan, China)
Keywords:
subway tunnel;  deformation;  silt soil;  excavation of foundation pit;  vertical displacement;  numerical analysis
PACS:
TU473
DOI:
-
Abstract:
The excavation of foundation pit could cause the uplift deformation of underlying subway tunnel in service, which would affect the operation safety of subway. Taking the foundation pit near subway as specific engineering case under the condition of silt soil in Zhengzhou East District, the specific mechanical parameters of Zhengzhou silt were obtained through indoor geotechnical experiments, and a three-dimensional numerical analysis model for the influence of foundation pit excavation on underlying subway tunnel was established. Then the influence of foundation pit excavation on the displacement of underlying subway tunnel was analyzed. The results show that the influence of foundation pit excavation on the vertical displacement of underlying subway tunnel is much greater than the impact on horizontal displacement. Compared with the condition of Shanghai soft soil, at the same excavation conditions, the vertical displacement of underlying subway tunnel which is caused by excavation of foundation pit under the condition of Zhengzhou silt soil is much less. The vertical maximum displacement of tunnel caused by pit excavation using conventional layered excavation method exceeds the subway protection standard of Zhengzhou. The foundation pit excavation using the scheme proposed through the methods of combining construction of uplift piles, block excavation and timely loading can greatly reduce the influence on the vertical displacement of underlying subway tunnel in service. The research results have guiding significance for the protection of underlying subway tunnel under the conditions of foundation pit excavation in Zhengzhou silt district.

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Last Update: 2019-09-29