Civil Engineering - UPSC Civil Service Exam Questions - Discussion

40. 

As the state of strain of an element of dense sand changes from plain strain to trivial condition, the effective angle of internal friction :

[A]. increases
[B]. decreases
[C]. remains constant
[D]. first increases and then remains constant

Answer: Option B

Explanation:

No answer description available for this question.

Manish said: (Jul 1, 2019)  
Increased because zero strain in all direction it gives a higher angle of internal friction compared to plane strain condition.

Cr Vivek said: (Sep 10, 2020)  
IF Dense sand is Sheared initially it will undergo compression & later interlocking b/w particles breaks and soil start to behave like loose sand; DILATION Occurs.

Loose sand: "coefficient of the angle of friction is less" (therefore "Less Strength ").
Dense sand: "coefficient of the angle of friction is More" (therefore "More Strength").

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