Abstract:  On the basis of the static-dynamic mechanics comparative test ， by means of test data comparison and analysis on characteristics of deformation and strength of the unsaturated and saturated sandy pebble soils under different test conditions, the test results indicated that: shear displacement is almost the same when unsaturated and saturated soils reach shear failure ； with pressure increase ， shear displacement increases ； with vibration number increase ， cohesion and internal friction angle decrease ； under different water contents ， the strength of saturated soil uniformly increases ； under the same vibration number ， and different consolidation stresses ， the failure stress is almost arithmetic progression relationship ； but the strength of unsaturated soil ununiformly increases ， sometime, the difference is very greatly. The strength parameter of unsaturated soil is bigger than that of the saturated soil.

Key words: sandy pebble soil   ,   static-dynamic behavior  ,    comparative test   ,   strength