TGPSC HMWSSB Manager 2015 Paper 2 · Question 40

Question 40 of the TSPSC Manager (Engineering), HMWSSB, 2015: Paper 2 (Civil Engineering) (1 November 2015). Try it first, then open the answer and explanation.

1. Manager 2015 Paper 2 (Civil) · Q40 · Geotechnical Engineering · Foundation Engineering

   The ultimate bearing capacity of a shallow foundation laid on a cohesion-less soil medium was estimated as 200 kN/sqm, when the water table was far below. All other conditions remaining the same, the ultimate bearing capacity of the foundation, when the water table was risen to ground level, is:

   1. 400 kN/sqm
   2. 200 kN/sqm
   3. 100 kN/sqm
   4. 50 kN/sqm
   Show answer

   Answer: (3) 100 kN/sqm

   For a cohesionless soil both terms of the bearing capacity equation (γD_f N_q and 0.5γBN_γ) contain the unit weight, which becomes the submerged unit weight (about half) when the water table rises to ground level. The capacity is therefore halved: 200/2 = 100 kN/sqm.

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