TGPSC HMWSSB Manager 2015 Paper 2 · Question 39

Question 39 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) · Q39 · Geotechnical Engineering · Soil Mechanics

   According to Boussinesque's theory, under the application of a point load of 100 kN on the surface, the pressure bulb corresponding to an increment in vertical stress of 47.75 kN/sqm will extend to a depth of:

   1. 0.50 m
   2. 1.00 m
   3. 2.00 m
   4. 4.00 m
   Show answer

   Answer: (2) 1.00 m

   Directly below the load, Boussinesq gives σ_z = (3/2π)Q/z² = 0.4775 Q/z². Setting 47.75 = 0.4775 × 100/z² gives z² = 1, so the bulb extends to z = 1.00 m.

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