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The assumption by Boussinesq was the soil is homogeneous, elastic and isotropic under a circular load.
The two elastic theory was developed by Burnister after Boussinesq developed the equation for evaluation of stress.
Boussinesq assumed the load as a single point load acting at a depth z and radius r.
The depth is zero, so the stress represented is at the surface of the pavement.
The depth is a function of the stress, depth and radius of the load acting on the point.
The radius is zero so it is possible only in a chart, which represents a point in the center of the chart.
The Poisson’s ratio for a homogeneous soil is assumed as 0.5.
The value of the constant F in finding out the deflection is 1.5.
The deflection is measured in mm, cm or m depending on the requirement of the pavement.
The constant value of the pavement in rigid pavement design is assumed as 1.18.
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