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中南大学学报(英文版)

Journal of Central South University

Vol. 28    No. 6    June 2021

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Analytical solution for evaluating deformation response of existing metro tunnel due to excavation of adjacent foundation pit
QIU Ju-tao(邱居涛)1, 2, JIANG Jie(江杰)3, ZHOU Xiao-jun(周晓军)1, 2, ZHANG Yue-feng(张越峰)1, 2, PAN Ying-dong(潘英东)1, 2

1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
3. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China

Abstract:The excavation of foundation pit generates soil deformation around existing metro tunnel with shield driving method, which may lead to the deformation of tunnel lining. It is a challenge to evaluate the deformation of shield tunnel accurately and take measures to reduce the tunnel upward displacement as much as possible for geotechnical engineers. A new simplified analytical method is proposed to predict the longitudinal deformation of existing metro tunnel due to excavation unloading of adjacent foundation pit in this paper. Firstly, the additional stress of soils under vertical axisymmetric load in layered soil is obtained by using elastic multi-layer theory. Secondly, the metro tunnel is regarded as a Timoshenko beam supported by Winkler foundation so that the shear effect of tunnels can be taken into account. The additional stress acting on the tunnel due to excavation unloading in layered soil are compared with that in homogeneous soil. Additionally, the effectiveness of the analytical solution is verified via two actual cases. Moreover, parametric analysis is conducted to investigate the responses of the metro tunnel by considering such factors as the variation of subgrade coefficient, offset distance from the excavation center to tunnel longitudinal axis as well as equivalent shear stiffness. The proposed method can be used to provide theoretical basis for similar engineering project.

 

Key words: metro tunnel; simplified analytical method; additional stress; Timoshenko beam; Winkler foundation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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