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GATE 2022 CE (CE2) – Question 40

Geotechnical Engineering · Shear strength, Mohr circle, stress-strain characteristics, stress paths · 2 marks · Multiple choice

Match P: volumetric strain of loose sand during drained triaxial compression; Q: excess pore pressure of loose sand during undrained compression; R: Skempton B for saturated soil; S: Terzaghi Nq for pure saturated clay. I: decreases; II: increases; III: remains same; IV: always 0; V: always 1; VI: always 0.5.

  1. (P)-(I), (Q)-(II), (R)-(V), (S)-(V)
  2. (P)-(II), (Q)-(I), (R)-(IV), (S)-(V)
  3. (P)-(I), (Q)-(III), (R)-(VI), (S)-(IV)
  4. (P)-(I), (Q)-(II), (R)-(V), (S)-(VI)

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Correct answer: (A) (P)-(I), (Q)-(II), (R)-(V), (S)-(V)

Explanation

Loose sand contracts during drained shearing, so the volume-change wording corresponds to decrease (I). Under undrained shearing that contraction tendency produces increasing positive excess pore pressure (II).

Saturated soil has Skempton B=1 (V). For pure clay φ=0, the surcharge bearing factor Nq=1 (V). **Answer: A**.