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Foundation Engineering
Bearing Capacity - Terzaghi Theory
The bearing c...
Question

The bearing capacity factors Nc Nq and Nγ are functions of

A
width and depth of footing
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B
density of soil
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C
cohesion of soil
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D
angle of internal friction of soil
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Solution

The correct option is D angle of internal friction of soil
Terzaghi's bearing capcity factors Nc, Nq and Nγ are function of angle of friction only.

Nc>Nq>Nγ for ϕ<30∘
Nc>Nγ>Nq for 30∘<ϕ<40∘
Nγ>Nc>Nq for ϕ<40∘

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Q. A strip footing of width 1.5 m is laid at a depth of 1 m. The ultimate bearing capacity of soil (in kN/m2) is ?


For ϕ=30∘, (Nc=19,Nq=8.3,Nγ=5.7)
Q.

A square footing of 2 m sides rests on the surface of a homogeneous soil bed having the properties: cohesion c = 24 kPa, angle of internal friction ϕ = 25o, and unit weight γ = 18kN/m3. Terzaghi's bearing capacity factor ϕ= 25o are Nc = 25.1, Nq = 12.7, Nγ = 9.7, N′c = 14.8, N′q = 5.6, and N′γ = 3.2. The ultimate bearing capacity of the foundation (in kPa, round off to 2 decimal places) is


Q. A multistory building with a basement is to be constructed. Top 4 m consists of loose silt, below which dense sand layer is present upto a great depth. Ground water table is at the surface. The foundation consist of the basement slab of 6 m width which will rest on the top of dense sand as shown in the figure. For dense sand, saturated unit weight = 20 kN/m3, and bearing capacity factors Nq=40 and Nγ=45. For loose slit, saturated unit weight = 18kN/m3, Nq= 15, Nγ = 20. Effective cohesion C' is zero for both soils. Unit weight of water is 10 kN/m3. Neglect shape factor and depth factor. Average elastic modulus E and Poisson's ratio (1/m) of dense sand is 60 × 103 kN/m3 and 0.3 respectively.


Using factor of safety = 3, the net safe bearing capacity (in kN/m2) of the foundation is
Q. A circular concrete pile of 3 m diameter carries a gross load of 4000 kN. The supporting soil is a clayey sand having the following properties : C=5kN/m2, ϕ=300 and γ=18.5 kN/m3. Find the depth at which the pier is to be located such that a factor of safety 3.0 (in m).
Bearing capacity factor for ϕ=300 are Nc=30.1, Nq=18.4 & Nγ=22.4

Q. The mean unconfined compressive strength of a purely cohensive soil was found to be 50kN/m2, The ultimate bearing capacity of a square footing calculated by Terzaghi's concept (bearing capacity factor Nc = 5.7) will be
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