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Dispersion of Extensional and Torsional Waves in Porous Cylinders with Patchy Saturation.

DE200515013444

Publication Date	2002
Personal Author	Berryman, J. G.; Pride, S. R.
Page Count	16
Abstract	Laboratory experiments on wave propagation through saturated and partially saturated porous media have often been conducted on porous cylinders that were initially fully saturated and then allowed to dry while continuing to acquire data on the wave behavior. Since it is known that drying typically progresses from the outside to the inside, a sensible physical model of this process is concentric cylinders having different saturation levels -- the simplest example being a fully dry outer cylindrical shell together with a fully wet inner cylinder. We use this model to formulate the equations for wave dispersion in porous cylinders for patchy saturation (i. e., drainage)conditions. In addition to multiple modes of propagation obtained numerically from these dispersion relations, we find two distinct analytical expressions for torsional wave modes.
Keywords	Dispersion Waves Equations Poroelasticity Wave propagation Torsional wave modes Porous cylinders Patchy saturation Saturated porous media
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200603

Dispersion of Extensional and Torsional Waves in Porous Cylinders with Patchy Saturation.

Dispersion of Extensional and Torsional Waves in Porous Cylinders with Patchy Saturation.
DE200515013444

Publication Date	2002
Personal Author	Berryman, J. G.; Pride, S. R.
Page Count	16
Abstract	Laboratory experiments on wave propagation through saturated and partially saturated porous media have often been conducted on porous cylinders that were initially fully saturated and then allowed to dry while continuing to acquire data on the wave behavior. Since it is known that drying typically progresses from the outside to the inside, a sensible physical model of this process is concentric cylinders having different saturation levels -- the simplest example being a fully dry outer cylindrical shell together with a fully wet inner cylinder. We use this model to formulate the equations for wave dispersion in porous cylinders for patchy saturation (i. e., drainage)conditions. In addition to multiple modes of propagation obtained numerically from these dispersion relations, we find two distinct analytical expressions for torsional wave modes.
Keywords	Dispersion Waves Equations Poroelasticity Wave propagation Torsional wave modes Porous cylinders Patchy saturation Saturated porous media
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200603