Rayleigh Wave discussion

[msucog]

anyone here learned in Rayleigh waves?

in particular, i'm interested in discussing the subject relative to application for evaluating deep foundations. i haven't found much on the subject but am trying to see if there may be possibilities to determine the depth of deep foundations by evaluating the Rayleigh waves. i've actually obtained field data and found some striking similarities to what we know exists. but i may just be trying to see something that doesn't exist. either way, anyone with input on the subject would be greatly appreciated. i would be glad to continue the discussion via email if that is more desirable than on this public board.

 

[RWF7437]

* Aki, K. and Richards, P. G. (2002). Quantitative seismology (2nd ed.). University Science Books. ISBN 0-935702-96-2.

* Fowler, C. M. R. (1990). The solid earth. Cambridge, UK: Cambridge University Press. ISBN 0-521-38590-3.

* Lai, C.G., Wilmanski, K. (Eds.) (2005). Surface Waves in Geomechanics: Direct and Inverse Modelling for Soils and Rocks"

Series: CISM International Centre for Mechanical Sciences , Number 481 , Springer, Wien, ISBN 978-3-211-27740-9

* Viktorov, I.A. (1967) “Rayleigh and Lamb Waves: physical theory and applications”, Plenum Press, New York

* Dilbag Singh and S. K. Tomar "Rayleigh–Lamb waves in a microstretch elastic plate cladded with liquid layers" Journal of Sound and Vibration, Volume 302, Issues 1-2, 17 April 2007, Pages 313-331

 

[msucog]

thanks. i'll take a look.

 

[DocDirt]

There is a relationship between R wave velocities and S wave velocities based on Poisson's ratio. If you have deifficulty estimating poisson's ratios, you assume shear wave velocity to be approximately equal in magnitude to R Wave velocity with 10% error. I was able to develop some correlations when I was a graduate student, long back.
DocDirt

 

[zaqqaz]

Can you provide more detail about the test that you have done? I have some experience with estimating the embedment depth of cavities in soil using Rayleigh waves and I got good results. Though, I am not sure whether they are applicable to this case.

 

[msucog]

i can't provide a lot of details at this particular time (because i'm not sure if the data is "real" or just a coincidence). essentially, i'm trying to figure out a way to use rayleigh waves to evaluate deep foundations (embeddment and/or integrity and/or other). it's sort of a "non-typical" approach and may be completely wrong for the application. in a sense, i'm just running a traverse at the foundation location.
once i've had the chance to perform some blind testing and gather the thoughts and opinions of those much more knowledgeable than myself, i'll gladly provide as much detail as i can (or am capable of). i've been told that i'm searching for the holy grail...so the odds are apparently stacked against me.
were you looking for vertical or horizontal planed cavities?