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Foundation Engineering

Modes of Shear Failure

In case of fo...

Question

In case of footing on the surface or shallow depth in very dense sand which one of the following types of failure is likely to occur?

Punching shear failure

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Local shear failure

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General shear failure

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Any of the above three

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Solution

The correct option is C General shear failure
At shallow depth or surface
Relative Density Type of failure
< 35 Punching shear
35 - 70 Local shear
> 70 General shear

Very dense sands have high relative density so general shear failure is most likely.

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Q. Likelihood of general shear failure for an isolated footing in sand decreases with

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 k N / m^{3}

, and bearing capacity factors

N_{q} = 40

and

N_{γ} = 45

. For loose slit, saturated unit weight =

18 k N / m^{3}

N_{q}

= 15,

N_{γ}

= 20. Effective cohesion C' is zero for both soils. Unit weight of water is

10 k N / m^{3}

. Neglect shape factor and depth factor. Average elastic modulus E and Poisson's ratio (1/m) of dense sand is 60

\times

10^{3}

kN/

m^{3}

and 0.3 respectively.

Using factor of safety = 3, the net safe bearing capacity (in kN/

m^{2}

) of the foundation is

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In case of footing on the surface or shallow depth in very dense sand which one of the following types of failure is likely to occur?

The correct option is C General shear failureAt shallow depth or surface Relative Density Type of failure < 35 Punching shear 35 - 70 Local shear > 70 General shear Very dense sands have high relative density so general shear failure is most likely.

The correct option is C General shear failure
At shallow depth or surface
Relative Density Type of failure
< 35 Punching shear
35 - 70 Local shear
> 70 General shear

Very dense sands have high relative density so general shear failure is most likely.