In using the data from a plate bearing test for deterring the modulus of sub-grade reaction, the value of settlement (mm) to be used is

3.75

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2.50

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1.25

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1.75

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Solution

The correct option is C 1.25
Modulus of subgrade reaction is based on settlement of 0.125 cm

Note : Modulus of subgrade reaction K may be defined as the pressure sustained per unit deformation of the subgrade at specified deformation or pressure level, using specified plate size. The standard plate size for finding K-value is 75 cm dia. But in some tests a smaller plate of 30 cm dia. is also used.

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