Abstract
Tunnel‒landslide systems are important and difficult engineering problems in tunnel construction. To investigate the dynamic response characteristics of the tunnel-slope system, the seismic response characteristics of layered slopes containing double-hole tunnels at the tunnel portal were investigated using the finite element method (FEM). Two two-dimensional models, including the layered slope (Model 1) and layered slope at the tunnel portal (Model 2), incorporating finite-element meshes with infinite-element boundaries for the models were used in the numerical dynamic analyses. The results show that the lithology of the surrounding rock and the tunnel structure have impacts on the wave propagation characteristics of slopes. Obvious slope elevation and surface dynamic amplification effects can be found. The dynamic amplification effect of the slopes increases with elevation, and the amplification effect of the slope surface is greater than that of the slope interior. In addition, the directions of waves affect the dynamic response of slopes. The vertical wave has a greater impact on the amplification effect of the tunnel structure and bedrock area than the horizontal wave. Horizontal waves have a greater magnification effect in soft and hard rock strata. Moreover, the tunnel structure magnifies the dynamic response of slopes, and the amplification effect of Model 2 to that of Model 1 is 1.0–1.25, overall. The magnification effect of the tunnel structure is mainly concentrated in the adjacent area of the tunnels, and the magnification effect of the left tunnel structure is greater than that of the right structure.
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Acknowledgements
This study was funded by the National Natural Science Foundation of China (52109125 and 52208359), the China Postdoctoral Science Foundation (2020M680583), and the National Postdoctoral Program for Innovative Talent of China (BX20200191).
Funding
National Natural Science Foundation of China, 52109125, Danqing Song, 52208359, Zhuo Chen, China Postdoctoral Science Foundation, 2020M680583, Danqing Song, National Postdoctoral Program for Innovative Talent of China, BX20200191, Danqing Song
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Danqing Song performed the data analyses and wrote the manuscript; Zhuo Chen helped perform the analysis with constructive discussions; Zhizheng Guo, Mengxin Liu, Junfeng Tang, and Xiangang Jiang carried out subsequent numerical simulation.
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Song, D., Chen, Z., Guo, Z. et al. Numerical investigation of the dynamic response characteristics of rock mass slopes containing double-hole tunnels subject to seismic excitation. Arab J Geosci 16, 430 (2023). https://doi.org/10.1007/s12517-023-11554-3
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DOI: https://doi.org/10.1007/s12517-023-11554-3