Undisturbed piston samples of arev silty Chicago clay were obtained from a depth ol 9 m, a...

Undisturbed piston samples of arev silty Chicago clay were obtained from a depth ol 9 m, as shown in the soil profile in Fig, lot laboratory testing. Different types strengths as well as consideration test were conducted, and the results of the consolidation test are shown in Fig. Unconfined com pression (UCC) tests on adjacent specimens from that depth had an average unconfined compressive strength of about 100 kPa.

(a) An additional specimen was trimmed and consolidated hydrostatically in a triaxial cell to 300 kPa: then it was sheared undrained (CU test). Estimate the compressive strength of this specimen.

(b) A companion specimen of the same clay was also consolidated to 300 kPa, but then it was sheared drained (CD test). Estimate the compressive strength of this specimen.

(c) Estimate the water content at failure for both the CD and CU triaxial specimens.

FIGURE P13.70b