Abstract: The pile is a kind of structure widely used in aquatic buildings such as bridge and dock. The impact force on the pile brought by landslide surge is crucial to the stability and safety of the whole aquatic building. On the basis of physical model experiments, characteristics of impact force brought by landslide surge on the pile were studied. Based on relevant data, a formula was worked out for calculating the extreme value of dynamic hydraulic pressure on the pile. The experimental results show that the maximum hydrodynamic pressure emerges when the volume surge spreads to pile, and there is a roughly negative correlation between its extreme value and the depth of the measuring point, which is similar to the solitary wave,and that the impact surge produces the second hydrodynamic pressure, and it decreases with the increase of water depth, which is similar to the regular wave.

Key words: landslide surge, pile, impact force, hydrodynamic pressure, calculating formula