Abstract:Sandy pebble soil has good engineering properties and has been applied widely in the engineering construction. In order to study the dynamic characteristics of deformation and strength under complex stress conditions,the dynamic characteristics of sandy pebble soils with different saturation degrees are studied thoroughly by dynamic triaxial tests in laboratory. The influences of the confining pressure,consolidation ratio and vibration frequency on the dynamic characteristics of sandy pebble soil are mainly analyzed. Results show that:(1) the dynamic stress of the sandy pebble soil increases little with the accretion of the consolidation ratio,but great with the increase of the vibration frequency;and the dynamic strength markedly increases with the accretion of the consolidation ratio;(2) under the same confining pressure,with the increase of the dynamic stress,the failure vibration time decreases;(3) the dynamic elastic modulus induces with the dynamic strain increasing,but increases as the accretion of confining pressure;and (4) the damping ratio increases with the dynamic strain increasing,especially in minor dynamic strain.