Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux

Type de document

COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)

Langue

anglais

Auteur

LEVACHER ; RAZAKAMANANTSOA ; KIMURA ; KATSUMI

Résumé / Abstract

Consistency and sensitivity of soft soils and sediments are important properties for geo-environment 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 T-bar test offers new opportunities as recap in this paper. A continuous profile of Su during penetration, pulling out and repeated cycles can be obtained. Su de-termination needs only the use of T-bar factor. Laboratory conditions of T-bar use is to be defined due to the small thickness of soft soil or sediment layer. Analyses of data results illustrate these difficulties. Another limitation of the test is based on the assumption that the full flow must be effective around the bar. Different authors have theoretically studied the full flow influence zone. The mechanism of full flow has been investigated experimentally using image analysis. Some of data analysis are report-ed and discuss considering full flow parameters. T-bar test is developed and adapted to soft soils and contaminated or not sediments for laboratory and field testing to provide for geo-environmental engi-neer a new investigation tool: a Sedi-bar test.