A circular raft foundation of $20 \mathrm{~m}$ diameter and $1.6 \mathrm{~m}$ thick is provided for a tank that applies a bearing pressure of $110 \mathrm{kPa}$ on sandy soil with Young's modulus, $E_{s}^{\prime}=30 \mathrm{MPa}$ and Poisson's ratio, $v_{s}=0.3 .$ The raft is made of concrete $\left(E_{c}=30 \mathrm{GPa}\right.$ and $\left.v_{c}=0.15\right) .$ Considering the raft as rigid, the elastic settlement (in $\mathrm{mm}$ ) is

(A) 50.96

(B) 53.36

(C) 63.72

(D) 66.71

A circular raft foundation of $20 \mathrm{~m}$ diameter and $1.6 \mathrm{~m}$ thick is provided for a tank that applies a bearing pressure of $110 \mathrm{kPa}$ on sandy soil with Young's modulus, $E_{s}^{\prime}=30 \mathrm{MPa}$ and Poisson's ratio, $v_{s}=0.3 .$ The raft is made of concrete $\left(E_{c}=30 \mathrm{GPa}\right.$ and $\left.v_{c}=0.15\right) .$ Considering the raft as rigid, the elastic settlement (in $\mathrm{mm}$ ) is

(A) 50.96

(B) 53.36

(C) 63.72

(D) 66.71

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