Cohesive Soil 



Refer to semi- 

 empirical method 

 of Vijayvergiya 

 and Focht (1972). 



Pile frictional 

 resistance (R ) 

 expressed as 

 function of 

 mean undrained 

 shear strength 

 (s ) and mean 

 effective over- 

 burden stress 

 (o ) over pile 

 length . 



R = \(a + 2s )A 

 a m s 



A. = empirical 

 coefficient 

 (below) ; A 

 = lateral 

 area of em- 

 bedded pile 

 (use area of 

 enclosed rec- 

 tangle for 

 "H" pile in 

 clay. 



(offer l/jayi/a./yY" """^ /^e.iT, /^72.). 



\ Method Simplification 



Above equation is rearranged to simplify process. R /A = f = 

 average, pile side friction 



Iterative selection process required ; Determine axial capacity 

 then increase length if needed. 



37 



