Abstract
Synopsis The response of a pore-pressure measuring system to a change of total stress in the soil is usually delayed since pore-water must enter the instrument. The relation between this time lag, the permeability and compressibility of the soil, and the compliance of the measuring system, is investigated on the basis of consolidation theory. Two cases are examined, namely, the response of an open standpipe or a closed system to pore-pressure changes in a clay stratum, and the time-lag associated with base measurement of pore pressure in the triaxial test. The in situ measurement of the consolidation characteristics of a soil by a constant head test is also examined. Les réactions d'un système de mesure par pression interstitielle à un changement de tension totale dans le sol sont en général retardées étant donné que l'eau de pression interstitielle doit pénétrer dans l'instrument. Le rapport entre ce retard, la perméabilité et la compressibilité du sol et réaction du système de mesure, est étudié à partir de la théorie de consolidation. Deux cas sont étudiés, soit, la réaction d'un tuyau de montée ouvert ou d'un système fermé à des changements de pression interstitielle dans une couche d'argile, et retard lié à la mesure de base de la pression interstitielle dans l'essai triaxial. La mesure sur place des caractéristiques de consolidation d'un sol par un essai à charge constante est aussi étudiée.
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