Question

Plate bearing test with $20cm$ diameter plate on soil subgrade yielded a pressure of $1.25\times {10}^{5}N/m^2$ at $0.5cm$ deflection. What is the elastic modulus of subgrade?

• A. $56.18\times {10}^{5}N/m^2$
• B. $44.25\times {10}^{5}N/m^2$
• C. $29.50\times {10}^{5}N/m^2$
• D. $50.19\times {10}^{5}N/m^2$

Answer 1

The correct option is C $29.50\times {10}^{5}N/m^2$

In plate bearing test on soil sub-grade we always use rigid plate.
Hence,

$\Delta =\frac{1.18pa}{E_s}$
Where, a = Radius of contact area

$0.5=\frac{1.18\times 1.25\times {10}^5\times 10}{E_s}$

$E_s=29.5\times {10}^{5}N/m^2$