Theoretical Analysis on Longitudinal Deformation of
Existing Tunnel&nbsp;Induced
by Adjacent Foundation Pit Excavation Considering Pasternak
Foundation Model

ZHANG Zhiguo, JIANG Kangming, WANG Zhiwei, XING Li, WEI Gang, DING Zhi

doi:10.3973/j.issn.2096-4498.2020.S1.008

2020 , Vol. 40 >Issue S1: 57 - 67

DOI: https://doi.org/10.3973/j.issn.2096-4498.2020.S1.008

Theoretical Analysis on Longitudinal Deformation of Existing Tunnel Induced by Adjacent Foundation Pit Excavation Considering Pasternak Foundation Model

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(1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, 
China; 2. State Key Laboratory for Track Technology of Highspeed Railway, Railway Engineering Research 
Institute, China Academy of Railway Sciences, Ministry of Land and Resources, Beijing 100081, China;  3. Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, Zhejiang, China)

Online published: 2020-09-16

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Abstract

The excavation of foundation pit excavation adjacent to existing tunnel will result in the damage of surrounding soil balance, which would lead to uneven settlement of adjacent tunnel structure, and eventually affect the safe operation of existing tunnel. In order to control the longitudinal deformation of existing tunnel caused by foundation pit excavation, a twostage method based on the Pasternak foundation model is adopted to study the longitudinal deformation of adjacent existing tunnel induced by double foundation pit excavation in soft soil. The results of the simplified theoretical calculation are compared with that of threedimensional finite element numerical simulation, and the comparison results show that the results by the two method coinside with each other well, thus it can be concluded that the simplified analytical method is of high accuracy and simple calculation. In addition, according to the distance between the foundation pit and the tunnel axis, the depth of excavation and the spacing of the foundation pit, the influence of double foundation pit excavation on vertical deformation of adjacent tunnel is analyzed under 3 layouts of double foundation pit parallel to tunnel, double foundation pit vertical to tunnel and double foundation pit oblique to tunnel. The analysis results reflect the law of tunnel deformation.

Key words： Pasternak foundation model; double foundation pit excavation; existing tunnel; longitudinal deformation; twostage analysis method; numerical simulation

Cite this article

ZHANG Zhiguo, JIANG Kangming, WANG Zhiwei, XING Li, WEI Gang, DING Zhi .

Theoretical Analysis on Longitudinal Deformation of Existing Tunnel Induced by Adjacent Foundation Pit Excavation Considering Pasternak Foundation Model

[J]. Tunnel Construction, 2020 , 40(S1) : 57 -67 . DOI: 10.3973/j.issn.2096-4498.2020.S1.008

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