Use of Rayleigh Waves in Liquefaction Studies

by Kenneth H. Stokoe, II, Univ of Texas, Civil Engineering, Dep, Austin, TX, USA,
Soheil Nazarian, Univ of Texas, Civil Engineering, Dep, Austin, TX, USA,

Abstract: The Spectral-Analysis-of-Surface-Waves method is a new seismic method for efficient determination of shear wave velocity in situ. Vertical impacts applied to the ground surface are used to generate Rayleigh waves with different frequencies. Propagation of the waves is monitored with surface receivers located known distances apart. By employing waveform analysis techniques, the variation of Rayleigh wave velocity with frequency is calculated. With inversion, shear wave velocity, shear modulus and layering of the site are determined. Several case studies where liquefaction occurred are presented. In each case, the shear wave velocities of the liquefiable layer were less than 450 fps.

Subject Headings: Shear waves | Surface waves | Wave velocity | Rayleigh waves | Shear stress | Wave propagation | Shear modulus | Shear strength

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