Numerical modelling of a shallow tunnel buried adjacent to a surface structure in liquefiable ground
Numerical modelling of a shallow tunnel buried adjacent to a surface structure in liquefiable ground
Earthquake-induced liquefaction is likely to cause uplift displacements of underground structures and excessive settlements of surface structures. While these two phenomena have been investigated separately in the literature, the case of a shallow tunnel buried adjacent to a surface structure in liquefiable ground remains to be thoroughly studied. In this paper, the OpenSees platform is employed to numerically model a centrifuge test on a tunnel-structure system in saturated Hostun sand. The PM4Sand constitutive model is calibrated to capture the nonlinear behaviours of the liquefiable ground. Overall, the numerical analysis is in good agreement with the centrifuge test data. The excess pore pressure build-up, the acceleration responses of the Hostun sand, the vertical uplift of the tunnel, and the settlements of the surface structure all are simulated with adequate accuracy. The validated numerical model is then used to investigate the boundary effect of the rigid container adopted in the centrifuge tests.
J. Zhang; Emilio Bilotta
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
4. Geotechnical earthquake engineering
https://doi.org/10.53243/NUMGE2023-54
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