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The plate load test is essentially a ___________
Plate load test is a field test to determine the ultimate bearing capacity of the soil, and the probable settlement under a given loading.
From the plate load test, the ultimate bearing capacity of plate of size 0.3 m × 0.3 m on sand deposit is observed to be 200 kN/m2, the ultimate bearing capacity of a footing of size 1.5 m × 1.5 m will be:
qup, qup = Ultimate load of plate and footing respectively,
Bf, Bp = Width of footing and plate respectively.
qup = 200 kN/m2, Bf = 1.5 m Bp = 0.3 m
For cohesive soil, qup = qup
Bearing Capacity is independent of footing size or plate width
The bearing plate used in plate load test is in the shape of __________
The bearing plate is either circular or square, made of mild steel of not less than 25 mm in thickness.
The loading to the test plate is applied with __________
The loading to the test plate may be applied with the help of a hydraulic jack. The reaction of the hydraulic jack may be borne by either any of gravity loading methodor reaction truss method.
The settlement of the plate in a load test is measured with the help of _________
The settlement of the plate is measured with the help of sensitive dial gauges. For square plate, two dial gauges are used. The dial gauges are mounted on independently supported datum bar.
A seating pressure of ___________ is applied on the plate before starting the load test.
A minimum seating pressure of 70 g/cm2 (0.7 t/m2), shall be applied and removed before starting the load test.
The value of factor of safety used, for finding safe bearing capacity is __________
In order to determine the safe bearing capacity, it would be normally sufficient to use a factor of safety of 2 or 2.5 on the ultimate bearing capacity.
For a c-φ soil, Housel suggested which of the following expression?
In 1929, Housel suggested the following expression for a c-φ soil:
Q = A .q + P .s
Where, Q = total load on bearing area;
P = perimeter of footing;
S = perimeter shear;
A = contact area of footing or plate.
The plate load test consists in loading a rigid plate at the _________
The plate load test essentially consists in loading a rigid plate at the foundation level, and determining the corresponding to each load increment.
The size of bearing plate, which used in plate load test varies from ___________
The bearing plate used varies in size from 300 to 750 mm with a chequered or grooved bottom.