Lecture 28 : Anchored sheet pile walls [ Section 28.2 : Different types of anchored sheet pile walls ]
Fig. 6.20 Fixed earth support
Comparison between fixed earth method and free earth method
The free earth support method gives a pressure distribution that would apply when the wall is on the point of failure by rotation about the anchor.
The fixed earth support method is unlikely to represent the true loading at any stage.
Both methods tend to over-estimate the bending moment in the pile.
The free earth support method is simpler.
In the fixed earth support, depth provided is more, moment through out the section reduces, so thiner section is to be provided.
In the free earth support, depth provided is less, moment through out the section is more than fixed earth support, so thicker section is to be provided.
