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Stable inversion of measured V P and V S to estimate porosity in fluid-saturated soils / C.G. Lai in Géotechnique, Vol. 62 N° 4 (Avril 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 4 (Avril 2012) . - pp. 359–364 Titre : Stable inversion of measured V P and V S to estimate porosity in fluid-saturated soils Type de document : texte imprimé Auteurs : C.G. Lai, Auteur ; J.G.F. Crempien de la Carrera, Auteur Année de publication : 2012 Article en page(s) : pp. 359–364 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Dynamics  In  situ  testing  Theoretical  analysis Résumé : Porosity is an important state parameter which controls the response of porous materials under both static and dynamic loading. The possibility of determining porosity from direct inversion of V P and V S, which are routinely measured in geophysical prospecting, is appealing. A methodology has been recently proposed and successfully applied to a number of sites and it is based on the apparent insensitivity of porosity on Poisson ratio of the soil skeleton ν SK, which is a priori an unknown quantity. So far, however, the functional dependence of porosity on ν SK has only marginally been investigated and doubts arise regarding whether the method is always applicable. This study attempts to investigate thoroughly the stability of the inversion of measured V S and V P to estimate porosity and to assess the degree of well-posedness of the procedure for all the combinations of V P and V S relevant in real soils. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/issue/geot/62/4# [article] Stable inversion of measured V P and V S to estimate porosity in fluid-saturated soils [texte imprimé] / C.G. Lai, Auteur ; J.G.F. Crempien de la Carrera, Auteur . - 2012 . - pp. 359–364. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 4 (Avril 2012) . - pp. 359–364 Mots-clés : Dynamics  In  situ  testing  Theoretical  analysis Résumé : Porosity is an important state parameter which controls the response of porous materials under both static and dynamic loading. The possibility of determining porosity from direct inversion of V P and V S, which are routinely measured in geophysical prospecting, is appealing. A methodology has been recently proposed and successfully applied to a number of sites and it is based on the apparent insensitivity of porosity on Poisson ratio of the soil skeleton ν SK, which is a priori an unknown quantity. So far, however, the functional dependence of porosity on ν SK has only marginally been investigated and doubts arise regarding whether the method is always applicable. This study attempts to investigate thoroughly the stability of the inversion of measured V S and V P to estimate porosity and to assess the degree of well-posedness of the procedure for all the combinations of V P and V S relevant in real soils. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/issue/geot/62/4#