Question

Asked Oct 27, 2019

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a 2.0m wide continuous foundation is placed at 1.5m depth in a saturated clay layer where Cu=40kn/m2 and gamma=18.5 kn/m3. At 2m below ground level, clay underlain by another stiffer clay layer, where Cu=60 and gamma=19. Whats the max wall load allowed if FS=3

Step 1

Given:

The width of the continuous foundation is 2 m.

The depth of the foundation *D _{f} *is 1.5 m.

The Factor of safety FOS is 3.

Detail of the soil existing up to the base of the foundation (Top layer):

The soil is saturated clay with cohesion value *C _{u1}* is 40 kN/m

The unit weight of the saturated clay is g_{1} is 18.5 kN/m^{3}.

Detail of the soil from the base of the foundation upto a depth of 2m from ground (Bottom layer):

The soil is stiffer clay with cohesion value *C _{u2}* is 60 kN/m

The unit weight of the stiffer clay is g_{2} is 19 kN/m^{3}.

Step 2

Assume:

The ultimate bearing capacity of the upper and the lower soil layer is denoted by *q _{t}* and

For clay soil, the value of bearing capacity factors *N*_{c} is 5.14, *N _{q}* is 1, and

For clay soil, the value of shape factors *S*_{c} is 1, *S _{q}* is 1, and

Step 3

Find the Ratio to determine whether the weaker soil laye...

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