Based on the sample-made technology of the liquid nitrogen freeze-dry

samples of saturation soft soil have been prepared. With the help of scanning electron microscope (SEM) technology

the microstructure images of the soft clay before and after its laboratory improvement with dynamic consolidation by drainage are obtained. The change of its microstructure parameters is studied by a developed computer program. Through comparing the results in terms of the number of pore

total area

total perimeter

the classification of area

the average diameter

and the shape coefficient

the roundness

the anisotropy

fractal dimension

the change of the soil microstructure after the improvement with dynamic consolidation by drainage has been studied preliminarily.