Civil Engineering - Soil Mechanics and Foundation Engineering - Discussion

3. 

The angle of internal friction of clays, is usually

[A]. 0° to 5°
[B]. 5° to 20°
[C]. 20° to 30°
[D]. 30° to 45°

Answer: Option B

Explanation:

No answer description available for this question.

Prasenjit Mandal said: (Aug 14, 2016)  
The answer must be 0 to 5.

Loben said: (Sep 6, 2016)  
5° - 20° is correct.

Archana Johari said: (Mar 12, 2017)  
Yes, as far as I know clay has a least angle of internal friction compare to all soils. So it must be 0-5.

Raju Raut said: (Mar 13, 2017)  
As angle of internal friction of clay is vary from 18 minimum and maximum 28 it is correct answer is B.

Parveen said: (Apr 24, 2017)  
Yes, it's 18 to 28.

Gokulnath said: (Aug 7, 2017)  
Option C correct.

If the clays are partial saturated and dry then it is said to be the angle of angle of internal friction >0, that is 20-28'.

For fully sat and pure clay angle of internal friction is 0.

Siddharth Shah said: (Sep 7, 2017)  
Clays are cohesive soils and their particle size is in the range of microns, they have very less angle of internal friction. Ideally it should be 0 or in the range of 0-5. Answer is A.

Biswajit P said: (Feb 11, 2018)  
Approximate maximum value of the angle of internal friction.
Rock- 30°.
Clay 20°.
Silt 34°.
Sand 30° to 40°.
Gravel 35°.

Anuj said: (Mar 5, 2018)  
It is 0-5.

Nikhil said: (Mar 16, 2018)  
Angle of internal friction:

Rock 30°.
Sand 30-40°.
Gravel 35°.
Silt 34°.
Clay 20°.
Loose sand 30-35°.
Medium sand 40°.
Dense sand 35-45°.
Gravel with some sand 34-48°.
Silt 26-35°.

Priya said: (Mar 20, 2018)  
Theoretically, a pure clay would have a value of 0° and Π would rise with increasing sand content and density to approximately 40° for a compact sandy loam soil. Loose sands range between 25 to 30°. As pure clays are rarely found in topsoils the typical value for a \'clay\'
soil would be in the range 5 to 10°

Priyanka said: (Aug 19, 2019)  
For Clay, the range is 5° - 10°.

Naveen Ceg said: (Jan 20, 2020)  
5° - 10° is correct.

Emanuel said: (Sep 27, 2021)  
Theoretically angle of internal friction for clay is 0°.

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