A group of bored piles, 0.5 m diameter and 15 m long is to be installed on a site underlain by the following strata:

0-3 m Medium clay (y= 18 kN/m3 and c = 40 kN/m2)
3-10 m Firm brown clay (Y= 19 kN/m3 and cu= 60 kN/m2
10 - 20 m Dense sand (Y= 20 kN/m3 and (Angle of friction= 35°, Nq = 70 and Ks*tan*delta=O.2)

Calculate the design resistance of a single pile to meet requirements.

Question

A group of bored piles, 0.5 m diameter and 15 m long is to be installed on a site underlain by the following strata:      
                     
 0-3   m Medium clay   (y= 18 kN/m3  and c = 40 kN/m2)
3-10  m Firm brown clay   (Y= 19 kN/m3  and cu= 60 kN/m2
10 - 20 m  Dense sand  (Y= 20 kN/m3  and (Angle of friction= 35°, Nq = 70 and Ks*tan*delta=O.2)

Calculate the design resistance of a single pile to meet requirements.

anonymous · Answer

Any one please help i cannot seem to get the Qb value for the pile.

anonymous · Answer

?

anonymous · Answer

I can work out the total skin resistance Qs but not Qb?