GATE Civil Engineering

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A group of nine piles in a $ 3 \times 3$ square pattern is embedded in a soil strata comprising dense sand underlying recently filled clay layer, as shown in the figure. The perimeter of a individual pile is $126$ cm. The size of pile group is $240$ cm $\times \: 240$ cm. The recently filled clay has undrained shear strength of $15$ kPa and unit weight of $16 \: kN/m^3$.

The negative frictional load (in kN, up to two decimal places) acting on the pile group is _____

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