Effect of impact mode on treatment effect of dynamic compaction

The practices show that "heavy hammer and low fall" and "light hammer and high fall" give different treatment effects. Considering material nonlinearity, geometric nonlinearity, contact nonlinearity, movement nonlinearity and coupling characters of them etc., large deformation dynamic nonlinear FEM based on explicit time integration is applied to simulating the impact process of dynamic compaction. The trace of soil, maximum collision force, collision duration have been obtained at the same single blow energy but with different combination of height and hammer weight. From the analysis, the efficiency coefficient and the influencing degrees of these soil parameters on the treatment effect are obtained. The results show the conclusion of "heavy hammer and low fall is superior to light hammer and high fall" is conditioned.