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Shear stiffness from in-situ field vane testing: Theory, results, and reservations

Mark A. Styler, John A. Howie, James T. Sharp

In the proceedings of: GeoRegina 2014: 67th Canadian Geotechnical Conference

Session: Soil Mechanics

ABSTRACT: This paper applies a theoretical equation to calculate the shear strain at the periphery of an in-situ vane. This is a new approach to interpreting pre-failure geotechnical vane data. We performed a suite of vane tests at a well characterized site in Surrey, BC to investigate the limitations of this equation. We found that the vane system, with a down-hole torque cell, has sufficient accuracy. We also found that the underlying assumptions behind the shear strain equation are reasonable. Our calculated shear stiffness degradation curves were comparable to empirically estimated curves. With this technique, high quality in-situ vane tests can be combined with shear wave velocities to calculate in-situ shear stiffness degradation curves in fine grained soil.

RÉSUMÉ: Cet article utilise une équation théorique pour calculer la déformation en périphérie des essais in situ au scissomètre. Ceci constitue une nouvelle approche qui permet de calculer la déformation de la rupture des essais in situ au scissomètre. Afin de déterminer les limites de cette équation, des tests au scissomètre ont été effectués sur un site à Surrey en C.-B. Nous avons remarqué que la mesure des capteurs de torque dans le trou de sondage est suffisamment courbes de la dégradation dtechniques empiriques. Avec cette technique, des essais in situ au scissomètre de grandes qualités peuvent être combinés à la vitesse de propagation des ondes de cisaillement afin de calculer des courbes de la dégradation du module de cisaillement dans des sols à grains fins.

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Cite this article:
Mark A. Styler; John A. Howie; James T. Sharp (2014) Shear stiffness from in-situ field vane testing: Theory, results, and reservations in GEO2014. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GeoRegina14Paper304, author = Mark A. Styler; John A. Howie; James T. Sharp,
title = Shear stiffness from in-situ field vane testing: Theory, results, and reservations ,
year = 2014
}