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Earthquakes and Structures Volume 26, Number 3, March 2024 , pages 229-237 DOI: https://doi.org/10.12989/eas.2024.26.3.229 |
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Factor analysis of subgrade spring stiffness of circular tunnel |
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Xiangyu Guo, Liangjie Wang, Jun Wang and Junji An
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| Abstract | ||
| This paper studied the subgrade spring stiffness and its influencing factors in the seismic deformation method of circular tunnel. Numerical calculations are performed for 3 influencing factors: stratum stiffness, tunnel diameter and burial depth. The results show that the stratum stiffness and tunnel diameter have great influence on the subgrade spring stiffness. The subgrade spring stiffness increases linearly with stratum stiffness increasement, and decreases with the tunnel diameter increasement. When the burial depth ratio (burial depth/tunnel diameter) exceeds to 5, the subgrade spring stiffness has little sensitivity to the burial depth. Then, a proposed formula of subgrade spring stiffness for the seismic deformation method of circular tunnel is proposed. Meanwhile, the internal force results of the seismic deformation method are larger than that of the dynamic time history method, but the internal force distributions of the two methods are consistent, that is, the structure exhibits elliptical deformation with the largest internal force at the conjugate 45o position of the circular tunnel. Therefore, the seismic deformation method based on the proposed formula can effectively reflect the deformation and internal force characteristics of the tunnel and has good applicability in engineering practice. | ||
| Key Words | ||
| circular tunnel; seismic deformation method; sensitive factor analysis; subgrade spring stiffness | ||
| Address | ||
| Xiangyu Guo: College of Civil Engineering, Huaqiao University, Xiamen 361021, Fujian, China Liangjie Wang: POWERCHINA Chengdu Engineering Corporation Limited, Chengdu 611130, Sichuan, China Jun Wang and Junji An: Sichuan Highway Planning, Survey, Design and Research Institute Ltd, Chengdu 610041, Sichuan, China | ||