Lecture 28 : Anchored sheet pile walls [ Section 28.3 : Design of sheet pile wall by free earth support ]
The above equation can be solved for b. Then, d is determined as,
d = b + a.
The actual depth D is taken equal to 1.2 to 1.4 times d.
The force in the anchor rod can be calcualted as,
,
The values of and are determined from the pressure diagrams.
Cohesive soils
Consider the case, the sheet pile is driven in clay ( = 0), but has the backfill of cohesionless soil as shown in fig. The earth pressure distribution above the dredged line is same as that in case of cohesionless soil. However the pressure below the dredge line at any point at a distance of z from dredged level is given as,
For = 0 , = = 1.0.
Therefore, = 2c + 2c – h = 4c – h
Where,
h is the height of the sheet pile above the dredged level,
c is the cohesion and is the unit weight of the soil.
, 
and 
are determined from the pressure diagrams. 
= 0), but has the backfill of cohesionless soil as shown in fig. The earth pressure distribution above the dredged line is same as that in case of cohesionless soil. However the pressure below the dredge line at any point at a distance of z from dredged level is given as, 
= 0 , 
= 
= 1.0. 
= 2c + 2c – 
h = 4c – 
h 
is the unit weight of the soil. 
