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GATE CE 2020 Geotech. Engg. Quiz 9 (App update required to attempt this test)

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Question 1

A laterally unconfined saturated soil specimen is subjected to failure under an axial vertical stress of 120kN/m2. The failure plane is inclined at an angle of 450 to the horizontal. The cohesion value and the angle of Internal friction for the soil are respectively

Question 2

Following are the statements related to the stress paths in a triaxial testing of soils:
P. If , the stress point lies at the origin of the p-q plot
Q. If, the stress point lies on the p-axis of the p-q plot.
R. If, both the stress points p and q are positive.
For the above statements, the correct combination is

Question 3

A drained triaxial compression test on a saturated clay yielded the effective shear strength parameters as c' = 15 kPa and ϕ' = 22o. Consolidated Undrained triaxial test on an identical sample of this clay at a cell pressure of 200 kPa developed a pore water pressure of 150kPa at failure. The deviator stress (expressed in kPa) at failure is _________ .

Question 4

A consolidated undrained triaxial compression test is conducted on a normally
consolidated clay at a confining pressure of 100 kPa. The deviator stress at failure is 80 kPa, and the pore-water pressure measured at failure is 50 kPa. The effective angle of internal friction (in degrees, up to one decimal place) of the soil is_________

Question 5

A consolidated undrained tri-axial test was conducted on a normally consolidated clay yielding the following data
The difference between the normal stress and shear stress on the failure plane is _____ kN/m2.

Question 6

A conventional drained triaxial compression test was conducted on a normally consolidated clay sample under an effective confining pressure of 200 KPa. The deviator stress at failure was found to be 400 kPa. An identical specimen of the same clay sample is isotropically consolidated to a confining pressure of 200 kPa and subjected to standard undrained triaxial compression test. If the deviator stress at failure is 150 kPa, the pore pressure developed (in kPa, up to one decimal place) is _______________
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Dec 19ESE & GATE CE