Abstract: Experiments to determine the vertical static bearing capacity are carried out first in laboratory which is taken as
a reference for choosing the amplitudes of vertical dynamic loading. Then a series of experiments are carried out to study
the influences of factors, such as the scales of bucket, the amplitude and frequency of loading, the density of soils etc..
According to the experimental results, the responses of bucket foundations in calcareous sand under vertical dynamic
loadings are analyzed. It is shown that there exists a limited effected zone under vertical dynamic loading. The scale of
this zone is about one times of the bucket’s height. In this zone, the density of soil layer, the deformation and the pore
pressure change obviously.