EGT SAMPLING METHOD; TOWARD UNDISTURBED SAND SAMPLE

Jean-François St-Laurent, Jean-Marie Konrad

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: In Situ Testing and Instrumentation I / Essais in situ et instrumentation I

ABSTRACT: Numerous publications showed and described the impact of sampling technique disturbance effects on cohesionless soil samples and behavior. This paper presents a new sampling technique for fine granular soils in a saturated state, called EGT sampling technique. The EGT sampling technique stabilizes the soil by using a gelatin solution. As the gelatin solution temperature decrease, hydrogenous bridges are created between gelatin molecules to form a dissolvable elastic gel. Undrained triaxial tests were conducted to establish the viability of the technique. Obtained results suggest that the developed method maintains the soil grain to grain structure. Observed divergence between behaviors are associated to system saturation difference. In order to support and assist the EGT technique, an advanced and unified thermo fluid-mass flow numerical model, based on 11 equations was developed. The finite element model, allowed determining the stabilized soil volume under various boundaries conditions.

RÉSUMÉ: , ce qui a un impact sur leur comportement géotechniques sols pulvérulent fins saturés. Lpour créer un gel élastique pouvant être dissous. Des essais triaxiaux en condition non drainée la viabilité de cette technique. Les résultats obtenus suggèrent que cette technique ne modifie pas la structure du sol, que la configuration des contacts grains à grains est conservée. Les divergences de comportement observées sont reliées au degré de saturation du système. Afin de valider la méthode EGT, un modèle numérique équations de masse a été développé. Ce modèle numérique permet le

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