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GATE CE 2020 Geotech. Engg. Quiz 8
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Question 1
A cylindrical specimen of saturated clay 40 mm in diameter and 80 mm in overall length is tested in an unconfined compressive testing machine. If the specimen fails under an axial load of 46.5 N and the change in length at failure is 1 cm, then the unconfined compressive strength of sample ( in kN/m2) is
Question 2
A vane, 12 cm long and 8 cm in diameter, was pressed into a soft clay at the bottom of a bore hole. Torque was applied and the value at failure was 45 Nm. Find the shear strength (in kN/m2) of the clay on a horizontal plane.Assume 2 way shearing.
Question 3
Match List-I (Type of shear tests) with List-II (Mohr failure envelops of total stress) and select the correct answer using the codes given below the lists:
List-I
A) Undrained test on normally consolidated saturated clays.
B) Consolidated undrained test on normally consolidated saturated clays.
C) Drained tests on normally consolidated saturated cohesive soil.
D) Unconfined test on clays.
List-II
1)
2)
3)
4)
List-I
A) Undrained test on normally consolidated saturated clays.
B) Consolidated undrained test on normally consolidated saturated clays.
C) Drained tests on normally consolidated saturated cohesive soil.
D) Unconfined test on clays.
List-II
1)
2)
3)
4)
Question 4
A clay layer, 5 m thick, is covered by a 10 m sandy gravel stratum with a porosity of 30%, and with a dry unit weight of 19 kN/m3. Tests on the undrained samples of the clay gave results as follows: c = 32 kN/m2, 
and ∅ = 24 °.
The shear strength (in kN/m2) of the soil at the clay's mid level (point A) is
[Take specific gravity of sand = 2.77]
and ∅ = 24 °. The shear strength (in kN/m2) of the soil at the clay's mid level (point A) is
[Take specific gravity of sand = 2.77]
Question 5
A sample of clean sand was collected at a depth of 7m below ground. The sample had been under a horizontal load of 270 kN/m2, vertical load of 175 kN/m2 and a shear stress of 83.5 kN/m2. If the angle between the vertical stress and principal stress is 700, calculate the angle of internal friction.
Question 6
A soil along a horizontal plane at a depth of 6 m in a deposit of sand is having the following properties:
1) Dry unit weight = 18 kN/m3
2) Angle of internal friction = 33 °
3) Specific gravity = 2.65
If the ground water table rises from the depth of 2.4 m from the ground to the ground level, then the shear strength (in kN/m2) of soil change to
1) Dry unit weight = 18 kN/m3
2) Angle of internal friction = 33 °
3) Specific gravity = 2.65
If the ground water table rises from the depth of 2.4 m from the ground to the ground level, then the shear strength (in kN/m2) of soil change to
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Oct 22ESE & GATE CE
