Fig. 6.
Two panels, labelled a and b, each contain two graphs comparing C o T and C o P responses. In panel a, the left graph plots deviatoric stress q in kilopascals vertically from 0 to 1,200 against axial strain epsilon sub a horizontally from 0 to 22. The horizontal axis is labelled axial strain epsilon sub a in kilopascals. The legend identifies C o P D 95 S at 50 kilopascals and C o T D 86 S at 50 kilopascals, both with square markers. C o P D 95 S rises rapidly from zero to about 120 kilopascals at low axial strain, then gradually approaches approximately 150 kilopascals and remains nearly level through about 18 per cent axial strain. C o T D 86 S rises rapidly to approximately 80 kilopascals, then increases gradually to around 100 kilopascals by about 8 per cent axial strain, reaches approximately 120 to 130 kilopascals around 10 to 12 per cent and ends near 135 kilopascals at about 19 per cent. The right graph in panel a plots volumetric strain epsilon sub v in per cent vertically against axial strain epsilon sub a in per cent horizontally from 0 to 22, with the horizontal axis placed at the top. The volumetric-strain scale runs from negative 1 at the top through 0 to 7 per cent at the bottom. The legend identifies C o T D 86 S at 50 kilopascals and C o P D 95 S at 50 kilopascals. Both curves begin near zero. C o T D 86 S increases steadily downwards, reaching about 1 per cent near 3 per cent axial strain, 2 per cent near 6 per cent, 3 per cent near 12 per cent and approximately 3.8 per cent near 19 per cent. C o P D 95 S changes much less, reaching approximately 0.3 per cent by about 3 per cent axial strain and gradually increasing to approximately 0.6 per cent near 18 per cent. In panel b, the left graph plots deviatoric stress q in kilopascals vertically from 0 to 500 against axial strain epsilon sub a in per cent horizontally from 0 to 22. The legend identifies C o T U 86 S at 100 kilopascals and C o P U 95 S at 100 kilopascals, both with circular markers. C o P U 95 S rises rapidly to approximately 180 to 190 kilopascals by about 2 to 3 per cent axial strain, remains near 180 to 195 kilopascals with modest fluctuations, and ends near 185 kilopascals at about 19 per cent strain. C o T U 86 S initially reaches approximately 110 kilopascals and then decreases continuously, falling below 50 kilopascals by about 3 per cent axial strain, approaching approximately 10 kilopascals around 7 per cent and remaining close to zero from roughly 10 to 16 per cent. The right graph in panel b plots excess pore pressure delta U in kilopascals vertically against axial strain epsilon sub a, with the horizontal axis labelled in kilopascals and positioned at the top from 0 to 22. The vertical scale runs from negative 100 kilopascals at the top through 0 to 400 kilopascals at the bottom. The legend identifies C o T U 86 S at 100 kilopascals and C o P U 95 S at 100 kilopascals. Both begin near zero. C o T U 86 S increases rapidly to about 50 kilopascals and then more gradually towards approximately 100 kilopascals by about 18 per cent axial strain. C o P U 95 S increases to approximately 30 kilopascals at low axial strain and remains nearly constant around 30 kilopascals through the remainder of the plotted range.Comparison of CoT and CoP tailings at a same void ratio prior to shearing under (a) drained and (b) undrained triaxial compression loading