This exercise focuses on the 2D seismic analysis of a quay wall using PLAXIS 2D. It guides users through the modeling of a complete retaining structure composed of sheet piles, an anchor wall, tie rods, a waler beam, and concrete piles. The model is constructed in stages to realistically simulate the sequence of wall installation, backfilling, anchoring, and the application of operational loads. Once the construction is complete, real earthquake records are applied at the base of the model using compliant boundary conditions, allowing for a realistic representation of the seismic loading and soil-structure interaction.

To ensure the accuracy of the dynamic behavior, the soil properties used in this analysis are calibrated using a preceding 1D site response analysis. This supporting step is essential for defining the nonlinear shear stiffness and damping behavior of the backfill and weathered siltstone layers under seismic loading. The 1D analysis is performed in PLAXIS 2D and benchmarked against SHAKE results, providing confidence in the material parameters that are later transferred to the 2D quay wall model. It also ensures consistency between the input motion and the dynamic response of the soil.