Investigation of metro tunnel response to multiple adjacent large excavations in soft soils

被引：5
作者：
Li, Zhuofeng [1 ]
Yang, Kaiwen [2 ]
Xu, Xiaobing
Yang, Yijun [3 ]
Jiang, Yexiang [3 ]
Tong, Lei [3 ,4 ]
Chen, Yunmin [2 ]
机构：
[1] Guangxi Univ, Sch Civil Engn & Architecture, 100 Daxue East Rd, Nanning 530004, Peoples R China
[2] Zhejiang Univ, Minist Educ, MOE Key Lab Soft Soils & Geoenvironm Engn, 866 Yuhangtang Rd, Hangzhou 310058, Peoples R China
[3] Hangzhou Metro Grp Co Ltd, Hangzhou 310003, Peoples R China
[4] Zhejiang Inst Architectural Design & Res, Hangzhou 310030, Peoples R China
来源：
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY | 2024年 / 152卷
关键词：
Tunnel; Excavation; Displacement; Tunnel reinforcement; Soft soil; Field observation; SHIELD TUNNEL; PREDICTION; DISPLACEMENT; DEFORMATION; SIMULATION;
D O I：
10.1016/j.tust.2024.105935
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Adjacent engineering activities affect existing tunnels in service, causing safety concerns. Many studies have focused on single excavations overlying or parallel to adjacent existing tunnels. However, few have considered the responses of tunnels to multiple excavations with different orientations. In this study, the existing shield tunnels of Hangzhou Metro Lines 1, which were affected by both the nearby and overlying excavation simultaneously, in sensitive soft soils were investigated and presented. Field monitoring showed considerable displacement in the tunnels at different excavation stages. The interaction mechanism between the nearby and overlying excavation, the surrounding soil, and the existing tunnels was investigated by assessing the evolutionary pattern of the tunnel deformation. In addition, the mechanism of improving the safety and serviceability of tunnels through tunnel reinforcement, which has been ignored in past research, and the impact of tunnel reinforcement on the tunnel during the construction phase were evaluated. Empirical methods were proposed to estimate the impact range of nearby and overlying excavation and tunnel reinforcement construction. The results provide guidance for protecting metro tunnels during adjacent excavations in soft soils.
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页数：22
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