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GATE 2019 CE (CE1) – Question 39

Geotechnical Engineering · Sub-surface investigations: boring, SPT, CPT, plate load test · 2 marks · Multiple choice

Assess: P: Lateral stress in soil tested in an oedometer is always at rest. Q: For a perfectly rigid strip footing at deeper depth in sand, vertical normal contact stress at the edge exceeds that at the centre. R: Overburden-pressure and dilatancy corrections are not applied to measured SPT-N values in clay deposits.

  1. P true, Q true, R true
  2. P false, Q false, R true
  3. P true, Q true, R false
  4. P false, Q false, R false

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Correct answer: (A) P true, Q true, R true

Explanation

Oedometer confinement prevents lateral strain,corresponding to at-rest lateral stress(P true). At depth,the confinement around a rigid footing makes the contact stress edge-enhanced(Q true). The specified overburden and dilatancy corrections are conventionally used for granular soils,not clay SPT values(R true). Thus **all true,A**.