Question

Plate bearing test with 20 cm diameter plate on soil subgrade yielded pressure of $2.5\times {10}^{5}N/m^2$ at 0.5 cm deflection. The modulus of sugrade reaction is:

• A. $8\times {10}^{7}N/m$
• B. $5\times {10}^{7}N/m$
• C. $2.5\times {10}^{7}N/m$
• D. $7.5\times {10}^{7}N/m$

Answer 1

The correct option is B $5\times {10}^{7}N/m$

$K=\frac{P}{\Delta }=\frac{2.5\times {10}^5}{0.5\times {10}^{-2}}=5\times {10}^{7}N/m$