Compute the negative skin friction of the pile group, Civil Engineering

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A square pile group of 9 piles passes by a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 90 cm centre to centre. If the unconfined compression strength of the cohesive material is 60 kN/m2 and unit weight is 15 kN/m3, compute the negative skin friction of the pile group

 


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