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Hi,

In the supporting excel file of webinar-8, to compute the Lysmer-Kuhlemeyer Dashpot's damping coefficients, these formulae are used:

C_v= element_size * density_of_soil*P_wave_velocity_of_soil
and
C_h=element_size * density_of_soil*S_wave_velocity_of_soil

Can you please share any reference, where we can see the derivation of these formulae?

Thank you in Advance!

should be here:
Lysmer, John, and Roger L. Kuhlemeyer. "Finite dynamic model for infinite media." Journal of the engineering mechanics division 95.4 (1969): 859-877.