[Solved] The minimum depth of foundation below ground level for a res (2024)

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UPPSC AE Civil 2013 Official Paper II

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  1. 100 cm
  2. 80 cm
  3. 60 cm
  4. 50 cm

Answer (Detailed Solution Below)

Option 4 : 50 cm

Detailed Solution

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As per Cl. 7.2, IS:1904,

All foundations shall extend to a depth of at least 50 cm below the natural ground level.

Important Point:

The design of building foundations is performed based on prescribed serviceability and strength criteria laid down by various standard codes adopted by different countries.

Generally, the total settlement of a foundation is described under the serviceability criterion; whereas a strength criterion is described by bearing capacity of the soil or rock underlying the foundation.

As per Rankine formula, minimum depth of foundation is given as

\({{\rm{D}}_{\rm{f}}} = \frac{{\rm{q}}}{{\rm{\gamma }}} \times {\left( {\frac{{1 - {\rm{sin}}\phi }}{{1 + {\rm{sin}}\phi }}} \right)^2}\)

Where,

q = Gross bearing capacity, γ = Unit weight of soil, and ϕ = Angle of internal friction of soil

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More Shallow Foundation Questions

Q1.If two individual footings are too close as per design, then they should be converted as

Q2.A footing 3 m× 1.5 m in plan transmits a pressure of 160 kN/m2 on a cohesive soil having E = 8 × 104 kN/m2 and μ = 0.48. What is the immediate settlement at the centre, assuming the footing to be flexible? (Take Iw = 1.52)

Q3.Consider the following statements related to ultimate bearing capacity of footing based on the SPT and CPT values:1. The empirical correlations established in the USA between N and soil properties indicate the value of N conforms to certain standard energy ratios.2. The value of N to be used for getting ϕ is the corrected value for standard energy.3. The angleϕ obtained by this method can't be used for obtaining the bearing capacity factors.Which of the above statements are correct?

Q4.According to Terzaghi, a foundation is shallow if its

Q5.What is a raft foundation?

Q6.Two columns Ca and Cb spaced 3 m centre to centre are subjected to axial loads of 600 kN and 800 kN, respectively. IF good soil for foundation with safe bearing capacity as 200 kN/m2, is available at 2 m depth below the ground level, identify the type of foundation that is suitable and economical. Assume width of footing restricted to 2 m.

Q7.Which of the following is NOT a limitation of plate load test?

Q8.Two columns C1 and C2 spaced 3 m centre to centre, are subjected to axial loads of 600 kN and 800 kN, respectively. If good soil for the foundation with safe bearing capacity as 200 kN/m2, is available at 2 m depth below the ground level, identify the type of foundation which is suitable and economical. Assume the width of footing is restricted to 2 m.

Q9.The bearing capacity of soil supporting an isolated footing of size 3 m × 3 m will be affected by the presence of a water table located at a depth of __________ below the base of the footing.

Q10.The bearing capacity factors Nc, Nq and Nτare functions of :

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Q1.To determine _______________, the total load is divided by the safe bearing capacity of soil.

Q2.The safe bearing capacity of compact and dry coarse sand is

Q3.The piles driven at an inclination to resist inclined loads are known as

Q4.Wall footings is a type of

Q5.The gross bearing capacity of a strip footing 1.5 m wide located at a depth of 1.2 m in clay is 420 kN/m2. If the unit weight of the soil is 20 kN/m3, estimate the net bearing capacity in kN/m2 units.

Q6.If the soil has a very low bearing capacity and still if piles are not a feasible option, then the best choice is -

Q7.The most reliable field test to determine the bearing capacity of a soil is -

Q8.If two individual footings are too close as per design, then they should be converted as

Q9.The old type of wall foundation consisting of multiple steps of bricks or stone layers of gradually increasing width is called as

Q10.If the hard rock strata is very great depth, then the feasible economical pile type is -

[Solved] The minimum depth of foundation below ground level for a res (2024)
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