Abstract
There are many applications that require the information of near surface soil properties. The related areas include agricultural land management, levee/dam evaluation, landmines/UXO/tunnel detection, battle field condition assessment, and site foundation characterization, to name a few. To obtain soil properties in a non-invasive manner, a multi-channel analysis of surface wave (MASW) method based on laser-Doppler vibrometer was developed recently and reported in 157th ASA Meeting, Portland, OR. This talk will present the latest development. In particular, two methods of determination of the dispersive curve, i.e., the phase slope method and the two dimensional FFT transformation method, will be discussed. The emphasis will be given to demonstrate the capabilities of the two methods in identifying the fundamental mode and high modes of Rayleigh waves. An inversion algorithm using the measured dispersive curve can back calculate the soil profile, i.e., the shear wave velocity as a function of depth. Several case studies of the MASW method will be addressed.
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