Abstract: This article has accomplished the large model test for 1:20 loess slope, investigated the law of similitude, boundary condition treatment in the model test, studied the change rules of dynamic properties and dynamic response rules for loess slope in dynamic compaction, as well as the dynamic properties and dynamic response rules under the influence of the slope ratio. Results show that the amplitude of dynamic response increased with increasing slope ratio. The amplitude of dynamic response for loess slope in dynamic compaction fades out rapidly with the impact loading effect; the vibration cycle is less than 1s and the major frequency is between 25-45 Hz that no superimposed vibration will occur. The amplification effect on radial acceleration is more obvious for loess slope in dynamic compaction; the vertical vibration prevails at lower part of slope while radial vibration prevails at upper part of slope. There is amplification effect for response amplitude on impact vibration of on the ridge of loess slope. There is obvious amplification effect on slope for input acceleration along the slope, especially the most obvious amplification effect at the top of slope. The test results have favorable influence on revealing the rules of dynamic response for loess slope in dynamic compaction, so as to provide instructive reference for the engineering design and construction in loess regions.

Key words: dynamic compaction, loess, dynamic responses, model test