On the impact of soil permeability in the numerical simulation of seismically induced liquefaction
On the impact of soil permeability in the numerical simulation of seismically induced liquefaction
Soil permeability plays a significant role in the evolution of liquefaction phenomena induced by seismic loading. Experimental and field evidence suggests that soil permeability varies significantly during and after seismic excitation. This variation is mainly attributed to changes in the water flow path, which in turn affects the pore water pressure build-up and dissipation and the associated settlement during and post-liquefaction. Therefore, accurate modelling of the soil response during liquefaction requires an understanding of the permeability variations in addition to an appropriate constitutive model for the mechanical part. In this study, permeability changes are examined in the context of the liquefaction response of a saturated sand deposit. Fully coupled (u-p) dynamic consolidation finite element analyses are performed with the constitutive model PM4Sand in PLAXIS. The permeability variation is examined parametrically and validated against a well-documented centrifuge test (centrifuge model test No.1 of the VELACS project). The response is also compared with analyses adopting the common assumption of a constant permeability corresponding to static conditions.
Shengjie Ma; Stavroula Kontoe; David M. G. Taborda
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
3. Coupled analysis
https://doi.org/10.53243/NUMGE2023-406
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