Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (1): 213-225.doi: 10.13278/j.cnki.jjuese.20160331

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Numerical Analysis on Influence of Boundary Conditions on Seismic Dynamic Response of Underground Utility Tunnels

Shi Youzhi1,2, Chai Jianfeng3, Lin Shuzhi4, Li Xiufang1   

  1. 1. School of Civil Engineering and Architecture, Xiamen University of Technology, Xiamen 361024, Fujian, China;
    2. School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China;
    3. Technology Center, State Grid Xinyuan Company Ltd, Beijing 100161;
    4. Xiamen Construction Bureau, Xiamen 361003, Fujian, China
  • Received:2017-06-21 Online:2018-01-26 Published:2018-01-26
  • Supported by:
    Supported by Natural Science Foundation of Fujian Province (2016J01271) and Science and Technology Project of Housing and Urban-Rural Development and Department of Fujian Province (2015-K-38)

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Abstract: To explore the influence of a utility tunnel's dynamic boundary conditions on its seismic dynamic response, the authors targeted at the typical soil layer in Xiamen, China, and analyzed the site response under the effects of Rayleigh waves and shear waves through building a dynamic finite element (FE) numerical model, adopting the hardening soil model with small strain stiffness (HSS) as the constitutive model of soil, and constructing the three artificial boundary conditions, namely fixed boundary, viscous boundary, and free field. After evaluating the effectiveness of the three boundary conditions in terms of deformation characteristics and pseudo-spectral acceleration (PSA), the authors proposed an optimized dynamic boundary combination conditions in the seismic dynamic analysis of utility tunnels. The research results showed that under the effects of seismic waves (bottom horizontal acceleration time history) and Rayleigh waves, a viscous boundary condition only touched upon the absorption of external traveling waves while leaving out of the problem of seismic input and the elastic resilience of semi-infinite media outside the boundary, thus imposed restrictions on the soil mass's horizontal displacement within the model, and which resulted in a smaller horizontal displacement; under a free-field boundary condition, not the foregoing restrictions but the strong oscillations occurred; under the optimized dynamic boundary combination conditions of the excitation-applied side adopted fixed boundary, the excitation-free side viscous boundary, and the rest sides free-field boundary, there was less dynamic response cross interference under the effects of Rayleigh waves and bottom acceleration time history, so that the signals could be treated by linear superposition. In the meantime, the viscous boundary could absorb the dynamic response induced by seismic waves to a certain extent, and the free-field boundary could limit the deformation of the dynamic response induced by Rayleigh waves to some degree. The research findings are expected to provide a reference for an elaborate numerical simulation of the seismic response of underground utility tunnels and their seismic design.

Key words: underground pipe gallery, earthquake, Rayleigh wave, dynamic boundary, numerical analysis

CLC Number: 

  • TU435
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