Dynamic Interaction of Two Nearby Machine Foundations on Homogeneous Soil

This paper emphasizes on the dynamic interaction of two closely spaced embedded strip foundations under the action of machine vibration. One of the footings is excited with a known vibration source placed on the top of the footing, called the active footing. The objective is to study the effect of dynamic excitation of active footing on the nearby passive footing through a homogeneous c-φ soil medium. The analysis is performed numerically by using finite element software, PLAXIS 2D. The soil profile is assumed to obey the Mohr-Coulomb yield criteria. The analysis is performed under two different loading conditions; sinusoidal dynamic loading with constant and varying amplitude. Under the dynamic excitation, the settlement behavior of interacting footings is studied by varying the spacing between the footings. In addition, the variation of normal and shear stress developed below the passive footing is also explored. The response of the adjoining passive structure is found to be significant up to a spacing of 2B from the actual excited structure.