SOME FACTORS AFFECTING K₀-VALUES OF SAND MEASURED IN TRIAXIAL CELL

Abstract

A series of K₀-consolidation tests on reconstituted sand specimens was performed to evaluate the effects of several stress or strain factors on K₀-values. A double-cell triaxial apparatus was used to investigate the effects of (1) unpreferable variation in the radial strain during K₀-consolidation, (2) the different initial stress condition from which K₀-consolidation is started, (3) pre-shearing in the triaxial compression or extension stress condition and (4) the different sample preparation methods. A double-cell torsional shear apparatus was also used to evaluate the effects of torsional pre-shearing on K₀-values. It was found that in order to obtain reasonably accurate K₀-values of sand samples, the variations in radial strain induced both before and during K₀-consolidation should be limited to a rather small value. It was also found that the effects of torsional preshearing on the K₀-values were rather small as far as these torsional shearings induce small values of radial strain.