Question

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 1.5 m wide square footing founded at a depth of 1.5 m in the same sub-soil. Assume the total unit weight and factor of safety of 18.2 kN/m3 and 2.0 respectively

Answer #1

for a clayey soil

ultimate bearing capacity = ultimate load on the plate

Qu = load on plate / area

Qu = 45 kN / (.3 * .3)

Qu = 500kN/ m2

safe bearing capacity = Qu/ factor of safety

sbc = 500/2 = 250 kN / m2

total load that can be bear by the footing = (safe bearing capacity * area of footing) - weight of soil

(250 * 1.5*1.5) - ( area * depth * density of soil)

(562.5) - ( 1.5* 1.5* 1.5 * 18.2)

501.075 kN

hence the bearing capacity of soil is 250 kN/m2 and the load bearable by footing is 501.075 kN.

An Engineering consultant appointed on the construction of a
Bridge site decided to conduct the Plate load test to get fair idea
about the bearing capacity of the sub soil. The test was conducted
on a circular plate of 200 mm radius at a depth of 1.20 m below the
natural ground surface in pure clayey soil. The failure took place
at a load of 55000N. Calculate the safe bearing capacity of a 1.2 x
1.4 m rectangular footing founded...

PART – 1 Q.1 An Engineering consultant
appointed on the construction of a Bridge site decided to conduct
the Plate load test to get fair idea about the bearing capacity of
the sub soil. The test was conducted on a circular plate of 200 mm
radius at a depth of 1.20 m below the natural ground surface in
pure clayey soil. The failure took place at a load of 55000N. i.
Calculate the safe bearing capacity of a 1.2 x...

The ultimate bearing capacity of a 450mm diameter
plate is 200kN/m2. Determine the following
The ultimate bearing capacity of a circular footing
with a diameter of 2m in Clayey soil
The ultimate bearing capacity of a circular footing
with a diameter of 3m in Sandy soil
Settlement in footing if the total settlement of plate
is 5mm with footing diameter of 2.5m.

A plate load test was carried out on a sand soil at the
expected foundation depth on a circular plate of 45 cm diameter.
Failure of the soil below plate occurred when the applied load on
plate reached 734 kg. If a square footing of 3 m width is going to
be constructed on the same soil and at the same testing depth, what
will be the allowable bearing capacity in kg/cm2. (Take
F.S = 3).

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.

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