Q$1$ Isotropically consolidated drained $($CID$)$ and isotropically consolidated

undrained $($CIU$)$ triaxial tests are usually conducted to characterize the

drained and$/$or undrained behaviour of sand.

$(1)$ Illustrate the typical CID test results for loose and dense sand by

plotting the deviator stress versus axial strain and the volumetric strain

versus axial strain curves.

$(2)$ Illustrate the typical CIU test results for loose and dense sand by

plotting the deviator stress versus axial strain and the pore water

pressure change versus axial strain curves.

$(3)$ Explain using a stress path plot why a dense sand will exhibit a higher

failure deviator stress in a CIU test than that in a CID test when both

tests are conducted under the same effective confining stress prior to

shear.