Evaluation of Dynamic Frictional Behavior of Rock Joints through Shaking Table Test

摘要

In this study, inclined plane shaking table tests were carried out to estimate both static and dynamic friction angle of saw-cut rock joints under dynamic loading conditions. Accelerations and displacements of sliding rock block were obtained in the tests. The static friction angle was backcalculated by measuring yield acceleration at the onset of slide. The dynamic friction angle was estimated by closely approximating the experimental results to the program-simulated response. The tilt angle was also determined prior to dynamic test. As a result of dynamic testing, the static friction angle at the onset of slide as well as the dynamic friction angle during sliding were estimated to be significantly lower than the tilt angle. The difference between the tilt angle and other friction angles under dynamic condition was influenced by the magnitude and amplitude of base acceleration and inclination angle.