What is the negative skin friction, Civil Engineering

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A square pile group of 16 piles passes by a filled up soil of 3 m depth. The pile diameter is 25 cm and pile spacing is 75 cm. If the unit cohesion of the material is 18 kN/m2 and unit weight is 15 kN/m3.

Compute the  negative skin friction on the group.

 


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