10 20 30 40 50 60 70 80 90 100 



Relative Density, in % 



Figure 27. Triaxial cell friction angles 

 for various sands as a func- 

 tion of relative density 

 (Schmertmann, 1978). 



100 200 300 400 500 



CPT Bearing Capacity - q (kg/cm ) 



Figure 28. Method for estimating effec- 

 tive angle of friction (<j>') 

 from static cone bearing 

 resistance (c i ) (from 

 Mitchell et al. , 1978). 



45 



