Study of Dynamic Interface Friction Model under Seismic Loading

In past decades, a rigid block dynamic response has been monitored with shake table tests by many scholars to investigate how the transition develops from static to kinetic friction. The dynamic characteristics of the interface can be obtained after analyzing the test data. However, in a real life situation, the dynamic response of the upper structure is unknown, which makes it difficult for us to get access to the dynamic characteristics of the interface. In this article, we focus on how to get dynamic shear properties of the interface under the condition of known seismic wave, which will have many implications on better evaluation of the dynamic stability of interfaces. In a slip-slip phenomenon, existing models may estimate friction coefficient acceptably, where as they are unsuitable for stick-slip phenomenon because of the yielded large error. To calculate the sliding velocity of a slider when only the property of seismic waves is available, this research puts forward an improved interface friction model for stick-slip phenomenon, and introduces a method to determine interface friction coefficient. The model was first validated in geotextile-wood and wood-wood interfaces. The numerical results were then compared to actual experimental data obtained from a rigid block sliding along an inclined plane subjected to base harmonic acceleration. This model was applied to a soil-geotextile interface, which manifests that the simulated results are closed to the test. The findings will encourage an extension of this new method to a more general seismic loading case.