Numerical analysis of the tunnel uplift behavior subjected to seismic loading
1 Faculty of Civil Engineering, Hanoi University of Mining and Geology, Vietnam
2 Lulea University of Technology, Lulea, Sweden
- Từ khóa: Excess pore pressure, Liquefiable soils, Numerical analysis, Seismic loading, Tunnel uplift.
- Nhận bài: 18-08-2021
- Sửa xong: 28-11-2021
- Chấp nhận: 18-01-2022
- Ngày đăng: 31-07-2022
- Lĩnh vực: Kỹ thuật Xây dựng
Seismic loading has always been a major concern for any engineering structures, and thereby, underground facilities (e.g., tunnels) are not exceptional. It is due to the seismically induced uplift and instability of tunnels caused by the large deformation of liquefiable soils. Therefore, the tunnel uplift behaviors subjected to seismic loading are always taken into account in any designing stages of tunnels. This study's main goal was to evaluate how a tunnel buried in liquefiable and non-liquefiable soils would behave when subjected to seismic stress. Seismic and liquefaction potential assessments of the soils surrounding the tunnel were carried out using the finite-element method. In this study, PM4sand, an advanced constitutive model was adopted in all finite-element models. In addition, the uplift displacement and excess pore pressure of liquefiable soils were studied, under a typical earthquake. Investigations were also conducted into how the thickness of the non-liquefiable soil affected seismic loading, tunnel uplift displacement, and the buildup of excess pore water pressure. As a result, during the earthquake, liquefaction was triggered in most parts of the sand layer but not in the clay layer. In addition, the tunnel uplift displacement was triggered due to the relative motion and interaction at both sides of the tunnel. In addition, this study found that the thickness of the non-liquefiable soil layer (sand layer) had a significant impact on the build-up of excess pore water pressure and, consequently, the tunnel uplift displacement. The uplift displacement and excess pore water pressure build-up were higher the thinner the non-liquefiable layer was.
Adalier, K., Abdoun, T., Dobry, R., Phillips, R., Yang, D., and Naesgaard, E. (2003). "Centrifuge modelling for seismic retrofit design of an immersed tube tunnel" .International Journal of Physical Modelling in Geotechnics, 3(2), 23-35.
Boulanger, R., and Ziotopoulou, K. (2015). "PM4Sand (Version 3): A sand plasticity model for earthquake engineering applications." Center for Geotechnical Modeling Report No. UCD/CGM-15/01, Department of Civil and Environmental Engineering, University of California, Davis, Calif.
Boulanger, R. W., Khosravi, M., Khosravi, A., and Wilson, D. W. (2018). "Remediation of liquefaction effects for an embankment using soil-cement walls: Centrifuge and numerical modeling." Soil Dynamics and Earthquake Engineering, 114, 38-50.
Chian, S. C., Tokimatsu, K., and Madabhushi, S. P. G. (2014). "Soil liquefaction-induced uplift of underground structures: Physical and numerical modeling." Journal of Geotechnical and Geoenvironmental Engineering, 140(10), 04014057.
Chou, J., Kutter, B., Travasarou, T., and Chacko, J. (2011). "Centrifuge modeling of seismically induced uplift for the BART transbay tube." Journal of Geotechnical and Geoenvironmental Engineering, 137(8), 754-765.
Hu, J., Chen, Q., and Liu, H. (2018). "Relationship between earthquake-induced uplift of rectangular underground structures and the excess pore water pressure ratio in saturated sandy soils." Tunnelling and Underground Space Technology, 79, 35-51.
Vilhar, G., Laera, A., Foria, F., Gupta, A., and Brinkgreve, R. B. (2018). "Implementation, Validation, and Application of PM4Sand Model in PLAXIS." Geotechnical Earthquake Engineering and Soil Dynamics V: Numerical Modeling and Soil Structure Interaction, American Society of Civil Engineers Reston, VA, 200-211.
Vilhar, G., Laera, A., Foria, F., Gupta, A., and Brinkgreve Ronald, B. J. (2018). "Implementation, Validation, and Application of PM4Sand Model in PLAXIS." Geotechnical Earthquake Engineering and Soil Dynamics
Zheng, G., Yang, P., Zhou, H., Zhang, W., Zhang, T., and Ma, S. (2021). "Numerical Modeling of the Seismically Induced Uplift Behavior of Twin Tunnels." International Journal of Geomechanics, 21(1), 04020240.
Các bài báo khác