3D Numerical Investigation into the seismic behaviour of tunnels in natural soils
3D Numerical Investigation into the seismic behaviour of tunnels in natural soils
Extensive research has been directed to two-dimensional (2D) modelling of tunnel behaviour subjected to seismic loading. However, the propagation of seismic waves has an arbitrary direction with respect to the axis of the tunnel structure, which causes multi-directional loading of the soil deposit and the tunnel lining. 2D simplifications of these three-dimensional (3D) effects can have a significant impact on the prediction of the tunnel seismic response. Furthermore, most natural soils are characterised by high stiffness and peak strength due to their initial structure. Extreme events, such as earthquakes, can induce sufficient material stiffness degradation, which may significantly alter the soil-tunnel response. Such complex mechanical behaviour cannot be captured by simple elasto-plastic models, thus the need for a more advanced constitutive modelling able to include the initial soil structure and its subsequent degradation during non-monotonic loading. This paper presents novel results obtained from fully coupled non-linear 3D numerical simulations of a shallow circular tunnel in natural clays accounting for damage to structure induced by earthquakes.
Lowell Tan Cabangon; G. Elia; M. Rouainia; Suraparb Keawsawasvong
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
4. Geotechnical earthquake engineering
https://doi.org/10.53243/NUMGE2023-23
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