2025 Volume 81 Issue 13 Article ID: 24-13472
In this study, 3D dynamic effective stress analyses were conducted to reproduce the experimental results of a 1G field shaking table test subjected to biaxial horizontal seismic motion on saturated sandy ground. The 3D dynamic effective stress analysis used a model that accounts for the dissipation of excess pore water pressure. Three types of biaxial horizontal seismic motions with the same biaxial acceleration response spectra were input: one one-directional motion and two biaxial motions with different acceleration trajectories. Based on the analytical results, the build-up and dissipation processes of excess pore water pressure were consistent with the experimental results. Additionally, even in analyses using a model that does not consider the dissipation of excess pore water pressure, the increase process of excess pore water pressure was accurately reproduced. The increase of excess pore water pressure was greater under the biaxial horizontal seismic motions than under the one-directional seismic motion. This demonstrates the validity of the constitutive model used.
