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Wave Propagation In A Fluid-Filled Fracture-An Experimental Study

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dc.contributor.author Tang, X. M.
dc.contributor.author Cheng, C. H.
dc.contributor.other Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.date.accessioned 2012-11-29T20:44:45Z
dc.date.available 2012-11-29T20:44:45Z
dc.date.issued 1989
dc.identifier.uri http://hdl.handle.net/1721.1/75114
dc.description.abstract A laboratory experimental study has been carried out to investigate the mode trapping characteristics of a fluid-filled fracture between two elastic solids. Using a small circular cylindrical receiver of 2.7 mm diameter, we were able to measure the wave motion directly inside a 2.8 mm thick fracture and to obtain array data for the propagating waves. The data was processed using Prony's method to give velocity of the wave modes as a function of frequency. The experimental results agree with the theoretical predictions quite well. Specifically, in a "hard" (aluminum) fracture where the shear velocity of the solid is greater than the fluid velocity, four normal modes were detected in the frequency range up to 2.4 MHz. Whereas in a "soft" (lucite) fracture where the shear velocity is smaller than the fluid velocity, four leaky-P modes were detected in the same frequency range. In both cases, a fundamental mode analogous to Stoneley waves in a borehole was detected. In particular, the velocity of this mode approaches zero in the low frequency limit, as indicated by the theory and confirmed by the experiment in a low frequency range down to 25 kHz. en_US
dc.description.sponsorship Massachusetts Institute of Technology. Full Waveform Acoustic Logging Consortium en_US
dc.description.sponsorship United States. Dept. of Energy (Grant DE-FG02-86ERI3636) en_US
dc.publisher Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.relation.ispartofseries Earth Resources Laboratory Industry Consortia Annual Report;1989-04
dc.title Wave Propagation In A Fluid-Filled Fracture-An Experimental Study en_US
dc.type Technical Report en_US
dc.contributor.mitauthor Tang, X. M.
dc.contributor.mitauthor Cheng, C. H.
dspace.orderedauthors Tang, X. M.; Cheng, C. H. en_US


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