Investigation of response of metro tunnels due to adjacent large excavation and protective measures in soft soils

被引：243

作者：

Chen, Renpeng ^{[1
,2
]}

Meng, Fanyan ^{[1
]}

Li, Zhongchao ^{[1
]}

Ye, Yuehong ^{[1
]}

Ye, Junneng ^{[3
]}

机构：

[1] Zhejiang Univ, Dept Civil Engn, Hangzhou 310058, Zhejiang, Peoples R China

[2] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China

[3] Ningbo Rail Transit Project Construct Headquarter, Ningbo 315012, Zhejiang, Peoples R China

来源：

TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY | 2016年 / 58卷

基金：

美国国家科学基金会;

关键词：

Numerical analysis; Tunnel; Excavation; Displacement; Bending moment; DEFORMATION;

D O I：

10.1016/j.tust.2016.06.002

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The inevitable influence of large excavation in soft soils on nearby tunnels is of great concern in practice. In this paper, the influence of a nearby large excavation on existing metro tunnels of the Ningbo Metro Line 1 in sensitive soft soils is investigated and presented. Considerable displacement in the left tunnel closer to the excavation induced by the nearby excavation was revealed by field monitoring. Visible cracks and leakages were observed in left tunnel linings. Three dimensional numerical simulations are conducted to investigate the responses of the ground and left tunnel due to the adjacent excavation. The development of bending moment and displacement of the left tunnel during different construction stages of the nearby excavation is obtained. Then the interaction mechanism between the nearby excavation, surrounding soils and existing twin tunnels is investigated, which is of significance to the interpretation of the influence of the nearby excavation on the existing twin tunnels. Several protective measures for alleviating the influence of adjacent excavation on left tunnel are studied, including divided excavation, soil improvement and a cut-off wall. It is found that the left tunnel is influenced to varying degrees during different construction stages and the time effect is distinct for this large excavation in soft soils, which would be suggestive to engineers to pay more attention to the protection of adjacent tunnel during the crucial construction stages. The bending moment and displacement of the left tunnel is strongly related to the unloading effects and displacement of surrounding soils, which can be alleviated by means of proper improvement of excavation sequence. Comparatively, longitudinally divided excavation is more effective in protecting the left tunnel than soil improvement or a cut-off wall. This study is of certain reference value for protecting metro tunnels adjacent excavation in soft soils. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：224 / 235

页数：12

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