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On-line Access: 2022-07-19

Received: 2021-12-30

Revision Accepted: 2022-03-17

Crosschecked: 2022-07-19

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Jia-xin LIANG


Xiao-wu TANG


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Journal of Zhejiang University SCIENCE A 2022 Vol.23 No.7 P.564-578


Numerical analysis of the influence of a river on tunnelling-induced ground deformation in soft soil

Author(s):  Jia-xin LIANG, Xiao-wu TANG, Tian-qi WANG, Yu-hang YE, Ying-jing LIU

Affiliation(s):  Research Center of Coastal and Urban Geotechnical Engineering, Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China; more

Corresponding email(s):   tangxiaowu@zju.edu.cn

Key Words:  Tunnelling, Ground deformation, Numerical analysis, Reinforcement

Jia-xin LIANG, Xiao-wu TANG, Tian-qi WANG, Yu-hang YE, Ying-jing LIU. Numerical analysis of the influence of a river on tunnelling-induced ground deformation in soft soil[J]. Journal of Zhejiang University Science A, 2022, 23(7): 564-578.

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%T Numerical analysis of the influence of a river on tunnelling-induced ground deformation in soft soil
%A Jia-xin LIANG
%A Xiao-wu TANG
%A Tian-qi WANG
%A Yu-hang YE
%A Ying-jing LIU
%J Journal of Zhejiang University SCIENCE A
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%D 2022
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2100683

T1 - Numerical analysis of the influence of a river on tunnelling-induced ground deformation in soft soil
A1 - Jia-xin LIANG
A1 - Xiao-wu TANG
A1 - Tian-qi WANG
A1 - Yu-hang YE
A1 - Ying-jing LIU
J0 - Journal of Zhejiang University Science A
VL - 23
IS - 7
SP - 564
EP - 578
%@ 1673-565X
Y1 - 2022
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2100683

When tunnels are constructed in coastal cities, they will inevitably undercross a river. Exploring the influence of rivers on tunnelling-induced deformation in costal soft soil is of great significance for controlling excessive settlement and protecting surrounding buildings. This paper presents a case study of twin tunnels undercrossing a river in soft soil in Hangzhou, China. The soft soil of Hangzhou refers to cohesive soil in a soft plastic or fluid plastic state with high natural water content, high compressibility, low bearing capacity, and low shear strength. Considering the influence of the river, the research region was divided into two parts, inside and outside the river-affected area, based on monitoring data of the Zizhi Tunnel. The development law of surface settlement is divided into three stages. In the first and second stages, the surface settlement within and outside the river-affected area showed a similar trend: the settlement increased and the growth rate of settlement in the second stage was smaller within the river-affected area. In the third stage, the surface settlement continued to increase within the river-affected area, while it converged outside the river-affected area. Within the river-affected area, there was an asynchronization of the sinking rate and stability of vault settlements and surface settlements. A numerical model was established by simulating different reinforcements of the tunnel. The numerical model revealed that the ground movement is influenced by the distribution and amount of the excess pore water pressure. The excess pore pressure was concentrated mostly in the range of 1.0Ht–3.0Ht (Ht is the tunnel height) before the tunnel face, especially within the river-affected area. Inside the river-affected area, the dissipation of excess pore water pressure needs more time, leading to slow stabilization of surface settlement. When undercrossing a river, a cofferdam is necessary to reduce excessive ground deformation by dispersing the distribution of excess pore water pressure.


方法:1.结合隧道施工方案及地表沉降监测数据,分析河流对地表沉降的影响,并对比河流影响范围内外地表及拱顶沉降的发展规律(图5~7);2.通过Plaxis 3D数值模型,研究河流影响范围内外的沉降及超静孔隙水压发展情况,并与实测数据进行对比(图11,12,16和17);3.通过模拟围堰施工与否,研究围堰施工对于地表沉降的控制效果,以及对开挖面超静孔隙水压的影响(图14~17)。


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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