where p = plate bearing pressure 



c = average soil shear strength along failure zones 



Df = depth of embednnent 



7^ = unit weight of soil (subnnerged unit weight if under water) 





\ 



\ 

 \ 



\ 



\ 



\ 



I 



95 



Ex 



% confidence lin 

 pected value 



nits 





\ 

 \ 



v. 









"^ 











/ 



/ 

 / 

 / 



1 



— -''''' 



^"" — —. 







D 0.05 0.10 0.15 0.20 ( 



p (tsf) 



Figure 18. Statistical presentation of parameter A(p) as a function of 

 bearing pressure, p. 



yields 



Applying this to the plate bearing device with a plate settlement S 



6c (1 + 0.2 - ) + St, 



(11) 



where D is the plate width or diameter. 



Considering that most of the soil bearing capacity resistance is derived 

 from nearly circular failure surfaces extending below the base of the footing, 

 the quantity c may be taken as the shear strength at the depth D/2 below the 

 footing base. If the shear strength is assumed to vary linearly according to 

 Equation 7, then Equation 1 1 may be rewritten as 



24 



