Against many popular opinions modulus of subgrade reaction is not an exclusive property of a soil but depends mainly on the loaded area size of the footing or mat. Foundation selection this publication is adapted from the unified facilities criteria of the united states government which are. The subgrade modulus also known as the modulus of subgrade reaction is a stiffness parameter typically used in defining the support conditions of footings and mat foundations such as that shown on figure 1 the parameter is expressed in units of force length 3 physically however it is defined as the contact bearing pressure of the foundation against the soil that will produce a unit.
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