Y . = saturated unit weight of soil beneath phreatic surface; 



S 3.x. 



= unit weight of soil above phreatic surface; 



Y = unit weight of water; 

 w 



n = transformed coordinate (= z - z^^) ; 



rig = transformed coordinate at phreatic surface (= 0) ; 



9 = slope of ground surface; 



X, = parameters in Frontard's solution; 



a = effective normal stress; 



= normal stress coordinate of center of Mohr stress circle; 



o = effective normal stress on plane parallel to ground surface; 



= effective normal stress coordinate of origin of planes on Mohr stress circle 



= effective normal stress on plane oriented at angle a and depth z; 



= effective normal stress on plane parallel to ground surface; 



0^ - effective normal stress on plane normal to ground surface; 



a = effective normal stress coordinate of point of tangency of Mohr stress 

 circle with strength envelope; 



T = shear stress; 



Tg = shear stress coordinate of center of Mohr stress circle (= 0) ; 



T - shear stress on plane parallel to ground surface; 



3. 



= shear stress coordinate of origin of planes on Mohr stress circle; 



= shear stress on plane oriented at angle a and depth z; 



= shear stress on plane parallel to ground surface; 



T = shear stress on plane normal to ground surface; 

 sn r 6 ' 



T - shear stress coordinate of point of tangency of Mohr stress circle with 

 strength envelope; and 



4> = angle of internal friction. 



33 



