Accession Number : AD0778715

Title :   Evaluation of the O'Neil Shear-O-Meter for Performing Constant-Volume Direct Shear Tests.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : Gilbert,Paul A.

Report Date : APR 1974

Pagination or Media Count : 75

Abstract : Stability analyses of soil structures require knowledge of the shear strength of the soil in questions of drainage anticipated during loading in the field. An undrained strength measurement may be obtained in the triaxial compression test by closing all valves to the soil specimen to ensure no drainage during shear, but the triaxial compression test requires saturation and consolidation, processes which could require weeks to accomplish. The immediate concern of this study was to evaluate the O'Neil Shear-O-Meter, a direct shear apparatus so modified as to perform an undrained strength test by varying the normal stress during shear. O'Neil undrained strength tests may be performed in a very short time compared with the time required for triaxial compression undrained tests. The two tests are compared herein, as well as a comparison of drained strength information, which also can be obtained from the O'Neil test, with the standard drained direct shear. (Modified author abstract)

Descriptors :   *Foundations(Structures), *Soil mechanics, *Shear strength, *Measuring instruments, Calibration, Test methods

Subject Categories : Soil Mechanics
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE