Vibration of Embedded Footings - An Overview of Theory vs. Experimental Analysis

Reddy, M.S., Raghunandan, M.E, PrathapKumar, M.T, Raghavendra Rao, M.V, Ramesh, H.N. (2007)., Proceedings of First Indian Young Geotechnical Engineers Conference, Hyderabad, India, 298-305, 2007

Significant developments have taken place in the formulation of theoretical solutions with regard to behavioral understanding of vibrations of foundations. However, experimental verifications of such theoretical solutions are always a prerequisite for their final acceptance and adoption.
Experimental investigations of vibrating footings can be divided into three categories – Post construction measurement, small or large scale field experiments and small laboratory experiments. Each of this has its own merits and demerits. With case histories and field experiments the propagation of elastic waves is not interrupted by the presence of artificial lateral boundaries. But, in laboratory tests spurious wave reflection on the bin walls may profoundly affect the measured radiation damping. However, in a majority of literatures which have reported the case histories and field experiments, the required dynamic soil properties have not been obtained in detail. Also, the results affected by vertical or lateral soil homogeneity are not at all brought out. Further, in the case of embedded foundations, the effect of increased confining pressure which has significant influence on the response of soil foundation system is not highlighted. In this paper an attempt has been made to present an overview of these intricacies with regard to vibration of embedded foundations by comparing theoretical analysis with experimental results that have so for not been reported.