Scour effect on dynamic impedances of pile groups in layered soils

抄録

A three-dimensional numerical model is applied to the calculation of dynamic impedances of scoured pile groups embedded in layered soil deposits during earthquake. The pile group is modeled by means of beam finite elements and the soil is assumed to be a horizontally layered half space. The pile-soil-pile interaction and radiation damping are accounted for in the frequency domain by considering suitable Green’s functions expressing the dynamic force-displacement relationship at the nodes of pile elements. A parametric study to investigate the scour effect on dynamic impedances of 5×5 pile groups with various scour depths is discussed in this paper. It is found that the impedances decrease significantly as the scour depth increases.