1. A 15x15 concrete pile of 90 length is used to support a vertical load in a 90

Question

1. A 15x15 concrete pile of 90 length is used to support a vertical load in a 90' deep heavily over- consolidated clay layer followed by a deep sand layer. Assuming that the ground water table is located deep below ground surface, unit weight of concrete is 150pcf, elastic modulus of concrete is 3x106psi and using the soil properties given below determine the ultimate load and assuming a factor of safety value of 3 the allowable vertical load Properties of Clay = (total stress) 00 Cohesion 15psi Unit weight- 110pcf Properties of Sand -300 Cohesion = 0 Average Unit weight-105pcf

Explanation / Answer

Tip bearing in sand startas according to Meyerhof

Qp= 1.25*1.25*0.5*90*tan30=40.6 tonn

skin bearing =15*15*90*!2*15*0.0005= 1822.5 ton

total load of pile = 1.25*1.25*90*125*0.0005=10.5 tonn

ultimate load = 1822.5+40.6 -10.5=1852.6 ton

allowable load= 1852.6/3=617.53 ton

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