Energy Dissipation in Nearly Saturated Poroviscoelastic Soil Columns during Quasi-Static Compressional Excitations
Publication: Journal of Engineering Mechanics
Volume 138, Issue 10
Abstract
This paper presents a theoretical investigation on the energy dissipation in a nearly saturated poroviscoelastic soil column under quasi-static compressional excitations. Different components of the energy dissipation are evaluated and compared. The magnitude of fluid- induced energy dissipation is primarily a function of a normalized excitation frequency . For small values of , a drained soil column is fully relaxed and essentially behaves as a dry column with negligible pore pressure. For such a soil column, fluid-induced energy dissipation is negligible, and the total damping ratio of the column is essentially the same as that of the solid skeleton. For very high values of , a drained soil column is fully loaded and the excitation-generated pore pressure decreases as the fluid becomes more compressible. For such a soil column, the fluid pressure gradient only exists in a thin boundary layer near the drainage boundary, where drainage occurs and fluid induces energy dissipation, whereas the rest of the column is essentially undrained. Significant fluid-induced energy dissipation occurs for moderate values of because of a combination of moderate fluid pressure, pressure gradient, and fluid relative motion throughout the soil column. The effects of the boundary drainage condition, saturation, porosity, and skeleton damping ratio on fluid-induced energy dissipation are discussed.
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Acknowledgments
Support of this study is provided by the U.S. National Science Foundation under Grant Nos. CMMI-0826097 and CMMI-1059588. This support is gratefully acknowledged.
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Published In
Journal of Engineering Mechanics
Volume 138 • Issue 10 • October 2012
Pages: 1263 - 1274
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Sep 7, 2011
Accepted: Feb 23, 2012
Published online: Feb 25, 2012
Published in print: Oct 1, 2012
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