Accession Number : AD0781488

Title :   Psychrometric Measurement of Total Suction in a Triaxial Compression Test.

Descriptive Note : Final rept.,


Personal Author(s) : Johnson,Lawrence D.

Report Date : JUN 1974

Pagination or Media Count : 72

Abstract : The shear strength of foundation soils in important in the design of all types of foundations. For soils that are less than full saturated, however, the shear strength is especially difficult to determine. This study was initiated to study the applicability of the thermocouple psychrometric method for measuring negative pore water pressures or suction in less than fully saturated soils during undrained shear strength tests and thus to provide a more accurate basis for determining shear strength. The feasibility for measuring total suction of less than fully saturated soil specimens was demonstrated during triaxial compression tests. Reproducibility is limited to about plus or minus 1/2 atm of suction with current testing techniques; however, precise temperature control is not required, and the range of the thermocouple psychrometric technique extends to at least 50 atm of suction. (Modified author abstract)

Descriptors :   *Foundations(Structures), *Pile structures, *Soil mechanics, Soil tests, Soils, Saturation, Pore pressure, Shear strength

Subject Categories : Soil Mechanics
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE