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UPPSC AE Civil 2013 Official Paper II
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- 100 cm
- 80 cm
- 60 cm
- 50 cm
Answer (Detailed Solution Below)
Option 4 : 50 cm
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CT 1: Indian History
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Detailed Solution
Download Solution PDFAs 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)
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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 :
More Bearing Capacity Questions
Q1.To determine _______________, the total load is divided by the safe bearing capacity of soil.
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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
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