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Geomechanics and Engineering
  Volume 22, Number 6, September25 2020 , pages 497-507
DOI: https://doi.org/10.12989/gae.2020.22.6.497
 


Effect of new tunnel construction on structural performance of existing tunnel lining
Chungsik Yoo and Shuaishuai Cui

 
Abstract
    This paper presents the results of a three-dimensional numerical investigation into the effect of new tunnel construction on structural performance of existing tunnel lining. A three-dimensional finite difference model, capable of modelling the tunnel construction process, was adopted to perform a parametric study on the spatial variation of new tunnel location with respect to the existing tunnel with emphasis on the plan crossing angle of the new tunnel with respect to the existing tunnel and the vertical elevation of the new tunnel with respect to the existing one. The results of the analyses were arranged so that the effect of new tunnel construction on the lining member forces and stresses of the existing tunnel can be identified. The results indicate that when a new tunnel underpasses an existing tunnel, the new tunnel construction imposes greater impact on the existing tunnel lining when the two tunnels cross at an acute angle. Also shown are that the critical plan crossing angle of the new tunnel that would impose greater impact on the existing tunnel depends on the relative vertical location of the new tunnel with respect to the existing one, and that the overpassing new tunnel construction scenario is more critical than the underpassing scenario in view of the existing tunnel lining stability. Practical implications of the findings are discussed.
 
Key Words
    conventional tunneling; crossing tunnel interaction; underpassing tunnel; overpassing tunnel; finite-difference analysis; lining member forces
 
Address
Chungsik Yoo: School of Civil, Architectural Engineering and Landscape Architecture, Sungkyunkwan University, 2066 Seboo-ro, Jangan-gu, Suwon, Kyounggi-do 16419, Republic of Korea

Shuaishuai Cui: School of Civil Engineering, Shandong University, No. 17923, Jingshi Road, Jinan, Shandong Province, China
 

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