Thin-walled tube samples were obtained at depths of 5 m and 10 m in a deep depos

Question

Thin-walled tube samples were obtained at depths of 5 m and 10 m in a deep deposit of normally consolidated clay. The water table is at a depth of 3 m below the ground surface. The average total unit weight for the clay is 16 kN/m3 above or below the water table. An unconsolidated undrained (UU) triaxial compression test on a sample from the 5 m depth gave an undrained shear strength of 18 kPa. Estimate the undrained shear strength that would expected for the sample from the depth of 10 m, given the data for the other sample. Thin-walled tube samples were obtained at depths of 5 m and 10 m in a deep deposit of normally consolidated clay. The water table is at a depth of 3 m below the ground surface. The average total unit weight for the clay is 16 kN/m3 above or below the water table. An unconsolidated undrained (UU) triaxial compression test on a sample from the 5 m depth gave an undrained shear strength of 18 kPa. Estimate the undrained shear strength that would expected for the sample from the depth of 10 m, given the data for the other sample.

Explanation / Answer

In case of UU test the Mohr circle failure envelop is horizontal. So in this test phi of the soil is zero.So, shear strength only depends upon the 'C' value of the soil.
From the 1st sample the shear strength =18 kPa, so 'C' =18 kPa
in case of UU test shear strength does not depends upon the overburden pressure, o=and it is same for all identical sample of different stress.
So, the undrained shear strength for 2nd sample also 18kPa.

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