Application of a Simplified Inversion Technique to Published Surface Wave Dispersion Data–Comparisons with Advanced Methods of Inversion

Pelekis, Panagiotis; Athanasopoulos, George

doi:10.1061/9780784412121.278

Cited by 4 publications

(6 citation statements)

References 18 publications

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“…[36] and then improved by Pelekis et al . [37]. There are two steps in the process of scaling the parameters in the SIM: (i) determining the equivalent depth Z eq from the wavelength value of the phase velocity L PH ; (ii) calculating the S-wave velocity V s from the phase velocity V ph .…”

Section: Methodsmentioning

confidence: 99%

Falling weight deflectometer dispersion curve method for pavement modulus calculation

Xue

Huang

Zhang

et al. 2023

Phil. Trans. R. Soc. A.

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The falling weight deflectometer (FWD) test is a common non-destructive testing method for evaluating the structural capacity of pavements. At present, data processing of the FWD test mainly focuses on the deflection data, while paying less attention to the deflection-time history. Because a FWD is equipped with impulse loads and geophones, which allow for the generation and capture of surface wave signal propagation, it is hypothesized that Rayleigh wave dispersion theory can be applied to calculate the modulus profile along the pavement depth by analysing the dispersive properties of the deflection signal measured during FWD tests. To test this hypothesis, we develop a new methodology for the FWD test and data analysis, referred to as the FWD dispersion curve method. We first introduce the concept of the new method, followed by an illustration of the procedure and the experimental set-up. Case studies on three concrete pavement segments are then presented to evaluate the effectiveness of the FWD dispersion curve method. Modifications to the existing FWD device are further recommended for the impact loading sources and signal collection process so that the modulus of a much shallower layer, such as the concrete slab and upper asphalt layers, can be obtained. This article is part of the theme issue 'Artificial intelligence in failure analysis of transportation infrastructure and materials'.

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Section: Methodsmentioning

confidence: 99%

Falling weight deflectometer dispersion curve method for pavement modulus calculation

Xue

Huang

Zhang

et al. 2023

Phil. Trans. R. Soc. A.

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“…The SIM method can handle both normally and inversely dispersive soil profiles without using the concept of the elastic Half Space. The critical parameter of the SIM is the wavelength to depth converter which is highly affected by the shape of the dispersion curve and the Poisson's ratio, (Pelekis and Athanasopoulos, 2012).…”

Section: Simplified Inversion Methods (Sim)mentioning

confidence: 99%

A Comparative Study of Surface Waves Inversion Techniques at Strong Motion Recording Sites in Greece

Pelekis

Savvaidis

Kayen³

et al. 2015

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2015

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Surface wave method was used for the estimation of Vs vs depth profile at 10 strong motion stations in Greece. The dispersion data were obtained by SASW method, utilizing a pair of electromechanical harmonic-wave source (shakers) or a random source (drop weight). In this study, three inversion techniques were used a) a recently proposed Simplified Inversion Method (SIM), b) an inversion technique based on a neighborhood algorithm (NA) which allows the incorporation of a priori information regarding the subsurface structure parameters, and c) Occam's inversion algorithm. For each site constant value of Poisson's ratio was assumed (ν=0.4) since the objective of the current study is the comparison of the three inversion schemes regardless the uncertainties resulting due to the lack of geotechnical data. A penalty function was introduced to quantify the deviations of the derived Vs profiles. The Vs models are compared as of Vs(z), Vs30 and EC8 soil category, in order to show the insignificance of the existing variations. The comparison results showed that the average variation of SIM profiles is 9% and 4.9% comparing with NA and Occam's profiles respectively whilst the average difference of V s30 values obtained from SIM is 7.4% and 5.0% compared with NA and Occam's.

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“…The model was developed by obtaining V s vs. depth profiles at a number of locations of the urban area, through surface wave measurements, and applying geostatistical interpolation to derive V s values for unsampled points. Surface Wave Methods (SWM), have evolved during the past decade, into a powerful and economic tool for establishing V s vs. depth profiles and they are being used with increasing frequency in soil dynamics and geotechnical earthquake engineering applications [38,39]. The Spectral Analysis of Surface Waves (SASW) method was used in the present study to obtain 1D V s vs. depth profiles at 19 locations in the urban area of Chania [1,8].…”

Section: Measurement and Interpetation Of V S Profilesmentioning

confidence: 99%

“…The recorded signals are processed to generate a dispersion curve (phase wave velocity, V R vs. frequency of vibration), which is, in turn, inverted i.e. transformed to a shear wave velocity profile (V s vs. depth) through the process of inversion [39,38]. The maximum depth of wave penetration depends on the lowest frequency contained in the recorded time histories of ground vibrations.…”

Section: Measurement and Interpetation Of V S Profilesmentioning

confidence: 99%

See 1 more Smart Citation

Seismic microzonation of Chania, Crete (Greece) based on SASW measurements and non-linear site response analyses

Pelekis

Athanasopoulos

2013

Soil Dynamics and Earthquake Engineering

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Application of a Simplified Inversion Technique to Published Surface Wave Dispersion Data–Comparisons with Advanced Methods of Inversion

Cited by 4 publications

References 18 publications

Falling weight deflectometer dispersion curve method for pavement modulus calculation

Falling weight deflectometer dispersion curve method for pavement modulus calculation

A Comparative Study of Surface Waves Inversion Techniques at Strong Motion Recording Sites in Greece

Seismic microzonation of Chania, Crete (Greece) based on SASW measurements and non-linear site response analyses

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