STATIONARY DYNAMIC RESPONSE OF A CIRCULAR RIGID FOUNDATION PARTIALLY SUPPORTED BY A FLEXIBLE PILE AND INTERACTING WITH A TRANSVERSELY ISOTROPIC SOIL
DOI:
https://doi.org/10.26512/ripe.v2i6.21592Keywords:
Dynamic Soil-structure Interaction. Foundations Dynamics. Pile Dynamics. Green’s Function.Abstract
This paper investigates the vertical response of rigid circular foundation resting on the surface of a three-dimensional, transversely isotropic soil. The foundation interacts with the soil by two mechanisms. First, the foundation is partially supported by a flexible pile embedded in soil, in which case there are no stresses at the soil-foundation interface. In the second mechanism, the foundation is partially supported by the soil through soil-foundation interface stress. This article studies the change in the foundation dynamic response when supported by these two distinct mechanisms. The present analysis is based on two previously solved problems, namely the interaction of a rigid foundation with a transversely isotropic soil (Labaki, Mesquita and Rajapakse, 2014) and the response of a flexible pile embedded in
the transversely isotropic soil (Labaki, Mesquita and Rajapakse, 2015). The solutions to these two problems are computationally very demanding. The numerical studies reported in this article investigate the role of the mass-to-pile inertia ratio as well as the relative stiffness of the soil and the pile. An external vertical force acting on the foundation is considered as the excitation mechanism. The results are expressed in terms of vertical displacements of the foundation for distinct sets of parameters.
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Labaki, J., Mesquita, E., Rajapakse, R. K. N. D., 2014. Vertical Vibrations of an Elastic Foundation with Arbitrary Embedment within a Transversely Isotropic, Layered Soil. Computer Modeling in Engineering & Sciences, v. 103, p. 281-313.
Labaki, J., Mesquita, E., Rajapakse, R. K. N. D., 2015. Vertical Vibrations of a Pile in a Transversely Isotropic Soil. ICGE International Conference on Geotechnical Engineering.
Nazir, A. K., Azzam, W. r., 2010. Improving the bearing capacity of footing on soft clay with sand pile with/without skirts. Alexandria Engineering Journal, vol 49, pp. 371-377.
Rajapakse, R. K. N. D and Wang. Y. Green’s Functions for Transversely Isotropic Elastic Half Space. Journal of Engineering Mechanics, 119, No. 9, pp. 1724-1746, 1993.
Rangawala, H., Mukerjee, S., & Saran, S., 2012. Parametric analysis of pile foundations under dynamics loads. Proceedings of Indian Geotechnical Conference, n. H836, pp. 1005-1008.
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