Authors: Vessia, G.; Cherubini, C.

Source: Canadian Geotechnical Journal, Volume 44, Number 11, November 2007 , pp. 1378-1390(13)

Publisher: NRC Research Press

Abstract:

The evaluation of the pile-soil adhesion plays a fundamental role in the estimation of the side resistance for total stress analysis. Over the years, researchers have presented proposals for adhesion factor formulations even though only a few of them have shown a certain agreement in numerical and (or) methodological terms. Hence, several real-size experimental analyses have improved the understanding of the pile-soil adhesion phenomenon and mechanism. Nevertheless, the undrained shear strength (c_u) values depend on the experimental technique employed. Such results force engineers to make a difficult choice among various formulations. A reliability analysis is performed in this paper to take into consideration the variations in formulations and values of the side resistance of bored piles in clayey soils. This study involves piles having different lengths and diameters, which are supposed to be bored in Matera clays. Such soil is characterized by means of laboratory investigation campaign, and its mechanical and stochastic main features are reported here. Values of reliability index β are calculated by means of the first-order reliability method.

L'évaluation de l'adhésion pieu - sol joue un rôle fondamental dans l'estimation de la résistance des fûts pour l'analyse en contrainte totale. Au cours des ans, les chercheurs ont présentés des propositions pour les formulations du facteur d'adhésion même si seulement quelques-uns d'entre eux ont montré une certaine concordance en termes numériques et (ou) méthodologiques. Ainsi, plusieurs analyses expérimentales à pleine échelle ont amélioré la compréhension du phénomène et du mécanisme d'adhésion pieu - sol. Néanmoins, les valeurs de résistance au cisaillement non drainé c_u dépend de la technique expérimentale utilisée. De tels résultats obligent les ingénieurs à faire un choix difficile parmi les diverses formulations. Dans cet article, on fait une analyse de fiabilité pour prendre en considération les variations dans les formulations et les valeurs de résistance des fûts des pieux forés dans les sols argileux. L'étude implique des pieux ayant différentes longueurs et diamètres, qui sont censés être forés dans les argiles de Matera. Un tel sol est caractérisé au moyen d'une campagne d'essais en laboratoire et on fait rapport ici de ses caractéristiques mécaniques et stochastiques. Les valeurs de l'indice de fiabilité β sont calculées au moyen de la méthode de fiabilité du premier ordre.

Document Type: Research article

Publication date: 2007-11-01

More about this publication?

• Published since 1963, this monthly journal features articles, notes, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers, theoreticians, and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Papers on actual case records from practice are encouraged and frequently featured.
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