Characterization of Heterogeneous Soils Using Surface Waves: Homogenization and Numerical Modeling

Chammas, R.; Abraham, Odile; Côté, Philippe; Pedersen, H.; Semblat, Jean‐François

doi:10.1061/(asce)1532-3641(2003)3:1(55)

Cited by 20 publications

(11 citation statements)

References 10 publications

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“…As regards the purely numerical aspects of this work, a complete parametric study has ensured the stability of these FDM in surface-wave analyses (Bodet, 2006). In this particular parametric study, FDM are targeted for comparison with finite element models that have previously been validated in several studies (Semblat and Brioist, 2000;Chammas et al, 2003;Abraham et al, 2004;Bodet et al, 2004). Two examples of synthetic data computed from the homogeneous and two-layer FDM are presented in Fig.…”

Section: Synthetic Seismogramsmentioning

confidence: 99%

Near-offset effects on Rayleigh-wave dispersion measurements: Physical modeling

Bodet

Abraham

Clorennec³

2009

Journal of Applied Geophysics

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Section: Synthetic Seismogramsmentioning

confidence: 99%

Near-offset effects on Rayleigh-wave dispersion measurements: Physical modeling

Bodet

Abraham

Clorennec³

2009

Journal of Applied Geophysics

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“…Indeed, for wavelengths 7.5 times greater than the radius of circular inclusions, and within a concentration range from 0 to 50 %, surface waves homogenize the soil in accordance with the multiple-scattering homogenization theory (Christensen & Lo, 1979). By simulating via finite-element analysis, several random distributions of inclusions made of limestone or sandstone in a sandy matrix, Chammas et al (2003) evinced the increase of the shear wave velocity Vs with the concentration of stiff inclusions (for velocity contrasts ranging from 2.4 to 5.5). This relationship, validated using a small-scale model (Abraham et al, 2004) at two different concentrations (19% and 35%), allows one to estimate the concentration of inclusions present in a soil using only seismic measurement techniques.…”

Section: Introductionmentioning

confidence: 84%

“…Our measurements and interpretation showed that the obtained limestone particle concentrations were consistent with the grain size data. Compared to surface wave acquisition and processing, which also provide an estimation of the particle concentration in the ground (Chammas et al 2003), the main advantages of resistivity measurements are their rapidity and the ability of obtaining a 2D image allowing lateral variations of particle concentrations to be detected on a site. Table 2 …”

Section: Discussionmentioning

confidence: 99%

“…Recently, Chammas et al (2003) showed that Rayleigh waves are well-suited to the determination of shear wave velocity of a heterogeneous soil layer. Indeed, for wavelengths 7.5 times greater than the radius of circular inclusions, and within a concentration range from 0 to 50 %, surface waves homogenize the soil in accordance with the multiple-scattering homogenization theory (Christensen & Lo, 1979).…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of soils with stony inclusions using geoelectrical measurements

Rey

Jongmans

Gotteland

et al. 2006

Journal of Applied Geophysics

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Characterisation and sampling of coarse heterogeneous soils is often impossible using common geotechnical in-situ tests once the soil contains particles with a diameter larger than a few decimetres. In this situation geophysical techniques - and particularly electrical measurements - can act as an alternative method for obtaining information about the ground characteristics. This paper deals with the use of electrical tomography on heterogeneous diphasic media consisting of resistive inclusions embedded in a conductive matrix. The adopted approach articulates in three steps: numerical modelling, measurements on a small-scale physical model, and field measurements. Electrical measurements were simulated using finite element analyses, on a numerical model containing a random concentration of inclusions varying from 0 to 40 %. It is shown that for electrode spacing 8 times greater than the radius of inclusions, the equivalent homogeneous resistivity is obtained. In this condition, average measured resistivity is a function of the concentration of inclusions, in agreement with the theoretical laws. To apply these results on real data, a small-scale physical model has been built, where electrical measurements were conducted both on the model and on each phase. From these laboratory measurements, a very satisfying estimation of the percentage of inclusions has been obtained. Finally, the methodology applied to a real experimental site composed of alluvial fan deposits made of limestone rocks embedded in a clayey matrix. The estimated percentage of rock particles obtained via electrical measurements was in accordance with the real grain size distribution

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“…For material characterization applications, the results produced consist of the thickness and c T profile. MASW can be applied regardless of the variation in material properties with depth for: geotechnical purposes [17,11,8,2], road investigations [37,29], or underwater applications [34]. MASW has also been proposed for the localization and sizing of faults, e.g.…”

Section: Introductionmentioning

confidence: 99%