Question

2- An isolated square footing 2 m × 2 m is founded at a depth of 1.5 m below the ground surface, in an extended layer of C- soil. Soil angle of internal friction ()=25o, while C = 20 kN/m2. Density b = 16.5 kN/m3. Determine the net and gross allowable bearing capacity of this soil at foundation level, assuming a factor of safety equals 3.

Answer #1

Determine the depth at which a circular footing of (2+0.4Y) m
diameter be founded to provide a factor of safety of 3, if it has
to carry a safe load of (1500+10Y) kN. The foundation soil has a
cohesion of 10kN/m2, an angle of internal resistance of
(30 +Y)o. The water table is at the ground surface and
the unit weight of the soil is 19 kN/m3. Use Terzaghi’s
Analysis.
y=2

A wall is supported on a 1.0 m wide strip footing located 1.5 m
below the ground surface. The surrounding soil has a dry unit
weight of 17.5 kN/m3, a saturated unit weight of 19.0 kN/m3,
cohesion of 8 kPa and angle of internal friction of 26°.
Groundwater was located 2m below ground surface. Using a factor of
safety of 3, determine the allowable bearing capacity if a) the
footing is considered infinitely long, and b) the footing is 8...

A concrete strip footing with a width of B is
founded at the depth of D, below the surface of a
level site. The water table is at a depth of d
below the base of footing. The soil at the site consists of clay
having the following properties:
The unit weight =
gt, the
undrained cohesion = cu, the undrained
friction angle = fu,
the drained cohesion = c′ and the drained friction
angle = f′
Use Hansen’s theory...

A 1.5 m x 1.5 m square footing will be constructed on cohesive
soil. A centric column load on the footing is 250 kN. A unit weight
of soil, (γsoil) is 18.8 kN/m3 where as the unit weight of
concrete, (γconcrete) is 23.5 kN/m3. Cohesive soil with unconfined
compressive strength, (UCS) is 143.6 kN/m3. Design;
(i) the soil contact pressure.
(ii) the factor of safety against bearing capacity failure.

Part A
A square foundation has a width of 2.0 m. The soil has a
friction angle of φ' = 27 and c' = 15 kN/m2. The unit
weight of the soil γ = 18 kN/m3. Determine the allowable
gross load (kN) on the foundation with a factor of safety of of 3.
Assume that the depth of the foundation is 2.0 m and that general
shear failure occurs in the soil. Give only the numeric answer (no
unit).
Part...

A proposed square footing carrying a total load of 2,100 kN is
to be constructed on a uniform dense clean gravel. The gravel’s dry
unit weight is 20.7 kN/m3, and its angle of internal friction is
34°. The depth of the footing is 1.7 m below the ground surface.
Groundwater was not detected during the drilling program. Determine
the minimum dimensions of this proposed footing, using a factor of
safety of 3 and an assumed footing thickness of 0.5 m.

Determine the allowable design load for a column resting on a
rectangular footing 2 m by 9 m, buried to a depth of 2 m in clay
soil with a unit weight of 18.5 kN/m3, internal friction
of 39 degrees, a drained cohesion of 36 kPa and undrained shear
strength of 119 kPa. Assume the short-term condition governs, water
table is at the ground surface and use a factor of safety of 3.
Provide your answer in kN as a...

A 1.5 m square 0.4 thick footing supports a column load of 350
kN. The underlying soil has a unit weight of 18 kN/m3 and the
ground water table is 2 m below the ground surface. Compute the
change is vertical stress and final vertical stress beneath the
corner of this footing at a depth of 5 m using the 2:1 and
Boussinesq methods. The footing is placed on the ground surface.
Include selfweight of the footing. Discuss the differences...

Plate load test is adopted globally to determine in-situ bearing
capacity of the subsoil and considered as one of the most important
field test for any big construction project. A plate load test was
conducted on a 300 mm side square plate at a depth of 1.10 m below
the ground level in pure clayey soil for an important construction
site. Failure of the soil occurred at a load of 45 kN. A. Calculate
the safe bearing capacity of a...

500 mm thick square footing is to be placed at a depth of 0.5 m
in a clayey sand where c¢ = 10 kPa, f¢ =
34°, g = 19.0 kN/m3. The column load to be
applied on the footing is 2000 kN. What should be the width of the
footing?

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