A group of nine piles in a 3×3 square pattern in embedded in a soil strata comprising dense sand underlying recently filled clay layer, as shown in the figure. The perimeter of an individual pile is 126 cm. The size of pile group is 240 cm×240 cm. The recently filled clay has undrained shear strength of 15 kPa and unit weight of 16 kN/m3. The negative frictional load in (in kN, up to two decimal places) acting on the pile group is472.32

A group of nine piles in a 3×3 square pattern in embedded in a soil s

1.	A group of nine piles in a 3×3 square pattern in embedded in a soil strata comprising dense sand underlying recently filled clay layer, as shown in the figure. The perimeter of an individual pile is 126 cm. The size of pile group is 240 cm×240 cm. The recently filled clay has undrained shear strength of 15 kPa and unit weight of 16 kN/m3. The negative frictional load in (in kN, up to two decimal places) acting on the pile group is472.32
Answer» A group of nine piles in a $3 \times 3$ square pattern in embedded in a soil strata comprising dense sand underlying recently filled clay layer, as shown in the figure. The perimeter of an 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 (in kN, up to two decimal places) acting on the pile group is 472.32

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