A Sedi-bar test for measuring consistency of sediments
LEVACHER ; RAZAKAMANANTSOA
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
LEVACHER ; RAZAKAMANANTSOA
Résumé / Abstract
Consistency and sensitivity of soft soils and sediments are important properties for geoenvironment design as for as sediment management. Usually these properties are deduced from the determination of undrained shear strength Su using different laboratory and field tests namely fall cone test, vane shear test, cone penetrometer test, unconfined compressive test, shear box testing. Recently full flow penetrometers are used in offshore engineering. Based on the concept of full flow of soils around a horizontal diameter, the Tbar test offers new opportunities as shown and demonstrated in this paper. A continuous profile of Su during penetration, pulling out and repeated cycles can be obtained. Su determination needs only the use of T-bar factor. A Sedi-bar test is developed specially for soft soils and sediments and implemented for thin layers. But in laboratory testing, Sedibar must be carefully used. The conditions of Sedi-bar use are clearly reported from laboratory tests performed on kaolin clay and further on sediments. Conclusions are drawn and Sedi-bar test developments and future investigations are proposed for contaminated sediments characterization.
