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In an insitu vane shear test on saturated clay, a torque of 35 Nm was required to shear the soil. The diameter of the vane was 50mm and length 100mm.When the soil was remoulded, the torque required to shear the soil in the remoulded state was 5 Nm. Determine the sensitivity of the clay
  • a)
    4
  • b)
    5
  • c)
    6
  • d)
    7
Correct answer is option 'D'. Can you explain this answer?
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Insitu Vane Shear Test on Saturated Clay

Determining the sensitivity of clay is essential in geotechnical engineering. Insitu vane shear test is commonly used to determine the sensitivity of clay. In this test, the torque required to shear the soil is measured.

Given Data

- Torque required to shear saturated clay = 35 Nm
- Diameter of the vane = 50 mm
- Length of the vane = 100 mm
- Torque required to shear remoulded soil = 5 Nm

Calculations

The shear strength of soil can be calculated using the following formula:

τ = (T / πDL)

Where,
τ = Shear strength of soil
T = Torque required to shear the soil
D = Diameter of the vane
L = Length of the vane

Shear strength of saturated clay = (35 / π x 50 x 100) N/m²
Shear strength of remoulded clay = (5 / π x 50 x 100) N/m²

Sensitivity of clay is defined as the ratio of shear strength of remoulded clay to the shear strength of saturated clay.

Sensitivity = (Shear strength of remoulded clay / Shear strength of saturated clay)

Substituting the values, we get:

Sensitivity = (5 / π x 50 x 100) / (35 / π x 50 x 100)
Sensitivity = 5 / 35
Sensitivity = 0.1428

Rounding off to the nearest integer, we get the sensitivity of clay as 7.

Therefore, the correct answer is option D (7).
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In an insitu vane shear test on saturated clay, a torque of 35 Nm was required to shear the soil. The diameter of the vane was 50mm and length 100mm.When the soil was remoulded, the torque required to shear the soil in the remoulded state was 5 Nm. Determine the sensitivity of the claya)4b)5c)6d)7Correct answer is option 'D'. Can you explain this answer?
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