In the paper a new approach, based on the idea above indicated and on the elastic solution by Randolph and Wroth (1978), is proposed. The main difference is that non-linearity is taken into account not resorting to a backcalculated “operational stiffness” but directly using a “typical” shear stiffness degradation curve, deduced from laboratory tests, and introducing “pseudostrain” values to be used in accordance to the decay curve. The "pseudo- strain” is evaluated according to field performance: so it is possible to pass from a laboratory modulus non-linearity to a field modulus non-linearity. The assumed “pseudo strain” is directly the ratio between the settlement w (at the head of the pile) and the diameter D (i.e. the relative settlement) or a shear strain g, function of the pile settlement. Starting from the knowledge of the soil initial stiffness and pile characteristics, a complete non-linear load settlement curve can be evaluated.

Influence of field modulus non-linearity on pile settlement

BOVOLENTA, ROSSELLA;BERARDI, RICCARDO
2003

Abstract

In the paper a new approach, based on the idea above indicated and on the elastic solution by Randolph and Wroth (1978), is proposed. The main difference is that non-linearity is taken into account not resorting to a backcalculated “operational stiffness” but directly using a “typical” shear stiffness degradation curve, deduced from laboratory tests, and introducing “pseudostrain” values to be used in accordance to the decay curve. The "pseudo- strain” is evaluated according to field performance: so it is possible to pass from a laboratory modulus non-linearity to a field modulus non-linearity. The assumed “pseudo strain” is directly the ratio between the settlement w (at the head of the pile) and the diameter D (i.e. the relative settlement) or a shear strain g, function of the pile settlement. Starting from the knowledge of the soil initial stiffness and pile characteristics, a complete non-linear load settlement curve can be evaluated.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11567/238786
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