Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

In seismic wave measurements, soil dynamic parameters, i.e., shear wave velocity and shear modulus are determined from a dispersion curve of phase velocity with employing the theory of elasticity of soils. In this paper, a developed technique from Spectral Analysis of Surface Waves (SASW), namely as the Wavelet Spectrogram Analysis of Surface Waves (WSASW) is introduced for measurement of the soil dynamic properties at soft marine clay soils sites. This technique has capability to localize the interested response spectrum of surface waves, to reconstructed spectrograms of noisy seismic waves and produces the enhanced phase data to develop the phase velocity dispersion curve. A filtration procedure is also proposed in order to remove the noisy signals from the seismic records received during field measurement. The identification, denoising and reconstruction of the wave response spectrum from seismic surface wave propagation on a soft soil were carried out by using time-frequency analysis of continuous wavelet transforms. The wavelet analysis was used for providing good resolution of spectrogram at low frequency and their spectrograms could be used to clearly identify the various events of interest of the seismic surface waves and noisy signals. Good agreements were obtained between the measured shear wave velocities and the corresponding dynamic shear modulus by the WSASW technique compared to Continuous Surface Wave (CSW), SASW and conventional soil testing method that performed in the same site location. Some good empirical correlations were also obtained as study case for soft soil site.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

WSASW Application for Soil Dynamic Properties in Soft Soil Investigation at Kelang, Malaysia

Chicago, Illinois

In seismic wave measurements, soil dynamic parameters, i.e., shear wave velocity and shear modulus are determined from a dispersion curve of phase velocity with employing the theory of elasticity of soils. In this paper, a developed technique from Spectral Analysis of Surface Waves (SASW), namely as the Wavelet Spectrogram Analysis of Surface Waves (WSASW) is introduced for measurement of the soil dynamic properties at soft marine clay soils sites. This technique has capability to localize the interested response spectrum of surface waves, to reconstructed spectrograms of noisy seismic waves and produces the enhanced phase data to develop the phase velocity dispersion curve. A filtration procedure is also proposed in order to remove the noisy signals from the seismic records received during field measurement. The identification, denoising and reconstruction of the wave response spectrum from seismic surface wave propagation on a soft soil were carried out by using time-frequency analysis of continuous wavelet transforms. The wavelet analysis was used for providing good resolution of spectrogram at low frequency and their spectrograms could be used to clearly identify the various events of interest of the seismic surface waves and noisy signals. Good agreements were obtained between the measured shear wave velocities and the corresponding dynamic shear modulus by the WSASW technique compared to Continuous Surface Wave (CSW), SASW and conventional soil testing method that performed in the same site location. Some good empirical correlations were also obtained as study case for soft soil site.