Longitudinal seismic performance analysis of shield tunnels considering the effect of deformation joints

YU Haitao1,2 CHEN Dongyi3 JIANG Haixi

(1.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, China 200092)
(2.Shanghai Municipal Engineering Design Institute (Group) Company Limited, Shanghai, China 200092)
(3.Department of Geotechnical Engineering, Tongji University, Shanghai, China 200092)

【Abstract】Deformation joints can help shield tunnel accommodate uneven settlement and deformation along the longitudinal direction. At present, the longitudinal seismic analysis of shield tunnel does not take the influence of deformation joints into account, and the influence of deformation joints on the longitudinal seismic behavior of shield tunnel is not clear. In this paper, shield tunnel along longitudinal direction was simplified as a 3D beam element in viscoelastic foundation, and the interaction between tunnel and soil was simulated by foundation springs and dampers. A 3D refinement model was used to simulate the opening and displacement of deformation joints under earthquake by set axial compression spring and shear spring along circumferential distribution. The seismic response characteristics of shield tunnel with/without deformation joints were compared by input ground motion in different input directions and different spectral characteristics asynchronously, and parameter sensitivity analysis of the deformation joints spacing was carried out, which systematically revealed the influence law of deformation joints on the longitudinal seismic behavior of the shield tunnel. It was concluded that deformation joints can effectively reduce the internal force of shield tunnel under earthquake, and the damping effect of the deformation joints was weakened with the increase of their spacing. These conclusions can provide guidance for similar projects in seismic analysis and deformation joint design in the future.

【Keywords】 shield tunnel; seismic response; asynchronous input; deformation joints; damping effect;

【DOI】

【Funds】 The National Key Research and Development Plan of China (2017YFC1500703, 2018YFC0809602) The Nation Natural Science Foundation of China (51678438) The Shanghai Rising-star Program (17QC1400500) The Shanghai Committee of Science and Technology (16DZ1200302, 16DZ1201904, 18DZ1205103) The Foundation of Key Laboratory of Soft Soils and Geoenvironmental Engineering (Zhejiang University), Ministry of Education (2018P08)

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(Translated by FAN JC)

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This Article

ISSN:1004-4574

CN: 23-1324/X

Vol 27, No. 06, Pages 10-18

December 2018

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Article Outline

Abstract

  • 1 Analysis models and methods
  • 2 Application examples
  • 3 Optimization analysis of damping effect of deformation joint
  • 4 Conclusion
  • References