Lecture 28 : Anchored sheet pile walls [ Section 28.4 : Design of sheet pile wall by fixed earth support ]
As exact analysis of the anchored sheet pile with fixed earth support is complicated, an approximate method known as equivalent beam method is generally used. It is assumed that the sheet pile is a beam which is simply supported at anchor point M and fixed at the lower end K. Figure shows the bending moment diagram. The bending moment is zero at the inflection point I. The beam is divided into two parts as shown in figure. The following procedure is used for the analysis:
(a)
For beam AI:
determine the pressure at the dredged level,
determine the distance I of the inflection point from table 1.
determine the distance a i.e. the point of zero earth pressure ,
determine the pressure at the point of inflection as
determine the reaction for the beam IB by taking moments about point M of the anchor.
at the dredged level, 
at the point of inflection as 
for the beam IB by taking moments about point M of the anchor. 
