A method for treating soft clay by sand wick and explosive vibration is introduced. And a numerical modelling method is proposed for transforming the three-dimensional soft clay treatment by drainage consolidation with explosive vibrations into a two-dimensional plane strain problems. In this method

the sand drains is transformed into equivalent sand walls; and the explosive pressure on porthole is transformed into equivalent pressure walls

which is based on the mechanism of equivalent impulse. The deformation of soil skeleton and the non-Darcy seepage of pore water is coupled in the numerical modelling. A comparison between numerical results and in-situ experimental results shows that both results are comparable. The numerical method is capable of modelling the dynamic process of the occurrence and dissipation of excess pore pressure and the soil settelment in the course of dynamic consolidation.