|Table of Contents|

Supporting Design and Application of Deep Excavation Adjacent to Metro Tunnels in Soft Soil Area(PDF)

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

Issue:
2021年06期
Page:
128-137
Research Field:
软土基坑设计与变形控制
Publishing date:

Info

Title:
Supporting Design and Application of Deep Excavation Adjacent to Metro Tunnels in Soft Soil Area
Author(s):
LI Yu-feng1; 2;  FU Yi3;  XU Zhong-hua1; 2
(1. Shanghai Underground Space Engineering Design and Research Institute, East China Architecture Design and Research Institute Co., Ltd., Shanghai 200002, China; 2. Shanghai Engineering Research Center of Safety Control for Facilities Adjacent to Deep Excavations, Shanghai 200002, China; 3. Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai 200235, China)
Keywords:
soft soil;  deep excavation;  metro tunnel;  supporting design;  deformation control
PACS:
TU447
DOI:
10.19815/j.jace.2021.08052
Abstract:
The deformation control methods of the deep excavation adjacent to metro and its effect are introduced based on the deep excavation of Shanghai Zuyuan 2-16-1 Block project. According to the characteristics of the excavation engineering, a variety of technical measures were taken to protect the adjacent metro tunnels, including zoned excavation method, proper supporting system, steel support automatic axial force compensation system, ground treatment, and confined ground water control design. The results show that the maximum lateral displacement of diaphragm wall for each excavation zone is less than the statistical average value(0.42%H, H is the excavation depth)in Shanghai soft deposit, while the maximum lateral displacement of diaphragm wall in the excavation zones adjacent to the metro tunnels is quite close to the statistical lower limit value, which is 0.1%H. The confined water level near the metro tunnel area maintains a relatively stable level and the maximum water level variation is only 0.72 m. The cumulative maximum settlement of the adjacent metro tunnels upstream and downstream are 8.2, 5.1 mm respectively, which are less than the 20 mm allowable limit. Moreover, the tunnel curvature radius meets the requirement of the control value. Deformation control methods adopted in the project are proved to be effective in protecting the safety of the adjacent metro tunnels. Design and construction methods in the project can provide a reference for similar excavation projects in soft soil area.

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Last Update: 2021-11-01