Abstract
Analytical information of the mechanism of transient soil compaction was derived from the interrelations of impact velocity Vi and initial soil density ρ0, under confined impact loading of unsaturated soil. The evaluation of the stress, strain and time was expressed based on the stress wave quasi-critical state concept. The degree of compaction of the soil for various impact velocities was determined using energy stored or exhausted. The compaction of soil under dynamic loading was characterized with the relationship between void space and stress ratio.