Based on the laboratory dynamic consolidation tests of saturated oozy soft clay under impact loading

the dynamic response characteristics of pore water pressure were analyzed. The tests considered different combination schemes between hammer weight and dropping height. The relationship between pore water pressure and impact times followed the hyperbola. The rate of increase of pore water pressure is faster with impact number under high confining pressure; and for the pore water pressure of over consolidation soft clay under impact loading

the negative value occurred. The subsidiary stress of impact loading causes the increasing of pore water pressure; and the effective stress is increased because of the dissipating of pore water pressure. It is highly important to control construction quality by monitoring pore water pressure during on-site dynamic consolidation.