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Soil pressure and pore pressure for seismic design of tunnels revisited: considering water-saturated, poroelastic half-space

Abstract

This paper describes a systematic study on the fundamental features of seismic soil pressure on underground tunnels, in terms of its magnitude and distribution, and further identifies the dominant factors that significantly influence the seismic soil pressure. A tunnel embedded in water-saturated poroelastic half-space is considered, with a large variety of model and excitation parameters. The primary features of both the total soil pressure and the pore pressure are investigated. Taking a circular tunnel as an example, the results are presented using a finite element-indirect boundary element (FE-IBE) method, which can account for dynamic soil-tunnel interaction and solid frame-pore water coupling. The effects of tunnel stiff ness, tunnel buried depth and input motions on the seismic soil pressure and pore pressure are also examined. It is shown that the most crucial factors that dominate the magnitude and distribution of the soil pressure are the tunnel stiff ness and dynamic soil-tunnel interaction. Moreover, the solid frame-pore water coupling has a prominent influence on the magnitude of the pore pressure. The findings are beneficial to obtain insight into the seismic soil pressure on underground tunnels, thus facilitating more accurate estimation of the seismic soil pressure.

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Acknowledgment

This study was supported by the National Natural Science Foundation of China under Grant No. 51978462, which is gratefully acknowledged. The authors are grateful to the anonymous reviewers whose comments lead to improvements of the paper.

Author information

Correspondence to Jianwen Liang.

Additional information

Supported by: National Natural Science Foundation of China under Grant No. 51978462

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Zhu, J., Liang, J. Soil pressure and pore pressure for seismic design of tunnels revisited: considering water-saturated, poroelastic half-space. Earthq. Eng. Eng. Vib. 19, 17–36 (2020) doi:10.1007/s11803-020-0545-2

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Keywords

  • seismic soil pressure
  • seismic pore pressure
  • dynamic soil-tunnel interaction
  • water-saturated
  • poroelastic