Response of bridge foundations under the combined effect of landslide and seismic actions (Diana Salciarini, Univ. Perugia)

This study investigates the interaction between viaduct foundations and seismically induced landslides. Given the complexity of viaduct structures, seismic effects, and landslide phenomena, this research is vital for understanding infrastructure resilience. The motivation stems from documented cases of viaducts collapsing or being damaged by landslides, both seismic and rainfall-induced. The primary objective is to examine how different landslide types impact viaduct structures, focusing on foundation interactions. Methodologically, a three-dimensional model was developed using Plaxis 3D software. Under the considered configurations, results indicated that under static conditions, the landslide had minimal impact on viaduct movements, with deep foundations playing a stabilizing role. Under dynamic conditions, significant residual displacements were observed, demonstrating a shift in landslide behavior due to seismic activity.