The modulus of subgrade reaction is obtained from the plate bearing test in the form of load-deformation curve. The pressure corresponding to the following settlement value should be used for computing modulus of subgrade reaction
A
0.250 cm
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B
0.175 cm
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C
0.375 cm
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D
0.125 cm
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Solution
The correct option is D 0.125 cm Modulus of subgrade reaction is based on a 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.