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LABORATORY SETUP TO EVALUATE THE IMPROVEMENT OF GEOTECHNICAL PROPERTIES FROM POTASSIUM CHLORIDE SATURATION OF A QUICK CLAY FROM DRAGVOLL, NORWAY
Session: Problematic Soils and Ground Improvement II / Sols problématiques et amélioration du comportement II
Tonje Eide Helle, NTNU (Norway)
Rikke Nornes Bryntesen, Norwegian University of Science and Technology and Norwegian Public Roads Administration (Norway)
Helene Amundsen, Norwegian University of Science and Technology and Norwegian Public Roads Administration (Norway)
Arnfinn Emdal, Norwegian University of Science and Technology (Norway)
Steinar Nordal, Norwegian University of Science and Technology (Norway)
Per Aagaard, University of Oslo (Norway)
This laboratory study comprises testing of soft leached quick clay samples under three storage conditions; wrapped in plastic, submerged in de-aired water and submerged in a potassium chloride slurry. The main purpose is to reveal the potential of improving the soil strength by introducing salt ions to the soil in order to enable future use of unsafe clay areas. To enhance the precision of the study, the clay samples are taken by use of a miniature version (sample diameter 160 mm) of the Sheerbrooke block sampler to reduce the sample disturbance to a minimum. The clay is tested by index, triaxial and oedometer testing. Adding KCl to the clay, a 25 % increase is found in the undrained shear strength whereas the remolded undrained shear strength dramatically increased from <0.5 to 4 kPa. Further, increase in soil plasticity, preconsolidation pressure and stiffness is noticeable.
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