ABSTRACT
A series of triaxial shear tests (CD test) is performed to examine the stress-strain characteristics of the materials. Figure 2 shows the test apparatus used in experiment. Dense (Dr = 80%) and loose (Dr = 30%) specimens are prepared for both ‘white’ and ‘red’ samples. They were set in the triaxial apparatus and were permeated by distilled water for 24 hours to raise the degree of saturation. But, B value resulted in staying around 0.7 to 0.8, because of existence of many micro voids in the particles which is thought to prevent saturating. And, the specimens were sheared under the drain condition with various confining pressures, 100, 200 and 300 kPa, at the rate of 0.1 mm/min. Figures 3 and 4 show the principal stress difference (shear stress) and the shear strain relations and shear stress and volumetric strain relations for the ‘white’ sample. Likewise, Figures 5 and 6 are for the ‘red’ sample. Figures 7 to 10 indicate plots of the principal stress difference, q, and the effective mean stress, p′, at the peaks of principal stress difference and the volumetric strain for
the ‘white’ and ‘red’ samples, respectively. According to the figures, the critical state theory would be applicable to the samples used in experiment.
