Based on in site test of soft clay foundation treated with dynamic consolidation by drainage and dynamic consolidation tests in lab
the dynamic characteristics of strain and pore water pressure of soft clays under impact loading were analyzed associated with soil pressures. The study has shown that the axial strain and pore water pressures with impact number have different development models. The relationship between axial strain and impact number is of hyperbolic-logarithm function
and the development model between pore water pressure and impact number is of hyperbolic function.