5. A consolidated undrained (CU) test on a saturated clay yielded the following results: (24%) .After isotropic consolid

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5 A Consolidated Undrained Cu Test On A Saturated Clay Yielded The Following Results 24 After Isotropic Consolid 1 (78.85 KiB) Viewed 29 times

5. A consolidated undrained (CU) test on a saturated clay yielded the following results: (24%) .After isotropic consolidation: chamber confining pressure, = 100 kPa. (Ignore the backpressure.) .At failure: [] = 100 kPa, u = 50 kPa, deviator stress D₁ = 85 kPa. (a) Assume c =0, determine the friction angle. 20 (b) Assume c'=0, determine the friction angle '. (c) Determine the direction of failure plane relative to the direction of minor principle stress. (d) Determine the Skempton's pore water pressure parameter A₁ (e) According to the test results, is this a normally consolidated, lightly overconsolidated, or a heavily overconsolidated clay? Why? (f) What would be the undrained shear strength of the soil if it is under a total confining stress of 200 kPa.