Determination of Vertical Displacement of an Existing
Tunnel Caused by Underpass of QuasiRectangular Shield Tunnel

WEI Gang; ZHAO Deqianlin; QI Yongjie

doi:10.3973/j.issn.2096-4498.2022.06.003

Tunnel Construction >

2022 , Vol. 42 >Issue 6: 960 - 966

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.06.003

Determination of Vertical Displacement of an Existing Tunnel Caused by Underpass of QuasiRectangular Shield Tunnel

WEI Gang ,
ZHAO Deqianlin ,
QI Yongjie

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(1.Department of Civil Engineering,Zhejiang University City College,Hangzhou 310015,Zhejiang,China;2.Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province,Hangzhou 310015,Zhejiang,China;3.Zhejiang Engineering Research Center of Intelligent Urban Infrastructure,Hangzhou 310015,Zhejiang,China;4.Guangzhou Nansha Assets Operation Group Limited,Guangzhou 511466,Guangdong,China;5.College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,Zhejiang,China)

Online published: 2022-07-04

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Abstract

The effect of quasirectangular shield tunneling on an existing tunnel is investigated, and the vertical deformation law of the existing tunnel is determined by estimating the vertical displacement of soil caused by soil loss. This calculation is based on the random medium theory combined with the cumulative probability curve, and the vertical displacement of the tunnel is calculated using the cooperative deformation model of rotation and abutment dislocation. Furthermore, an indoor model test is conducted for the newlybuilt quasirectangular shield tunnel underpassing the existing tunnel. The soil loss is monitored, as it is the only factor causing the settlement of the existing tunnel and displacement of the crown during the entire construction process. Moreover, to validate the reliability of the theoretical calculation method, the measured values are compared with the calculated values. The results reveal the following: (1) The theoretically calculated results concur with the measured values, thereby confirming the reliability of the method. (2) The settlement law of the existing tunnel caused by the quasirectangular shield tunnel is consistent with that of a circular tunnel. (3) Due to soil loss, the underpass of the new tunnel leads to the settlement of the existing tunnel. Furthermore, the crown deformation of the existing tunnel is largest at the intersection with the new tunnel. (4) The crown settlement deformation of the existing tunnel increases gradually with the excavation of the tunneling face. Additionally, a stage of rapid deformation is observed.

Key words： quasirectangular shield tunnel; underpass existing tunnel; soil loss; vertical displacement; model test

Cite this article

WEI Gang , ZHAO Deqianlin , QI Yongjie . Determination of Vertical Displacement of an Existing Tunnel Caused by Underpass of QuasiRectangular Shield Tunnel[J]. Tunnel Construction, 2022 , 42(6) : 960 -966 . DOI: 10.3973/j.issn.2096-4498.2022.06.003

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