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UPSC Civil Service Exam Questions

Q1: 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

ANS:B - decreases

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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