Lecture 28 : Anchored sheet pile walls [ Section 28.2 : Different types of anchored sheet pile walls ]
There are types of anchored sheet pile walls
1.
Free earth support piles,
2.
Fixed earth support piles.
Free earth support piles
An anchored sheet pile is said to have free earth support when the depth of embedment is small and pile rotates at its bottom tip. Thus, there is no point of inflection in the pile. It is assumed that
The base of the pile is relatively free to move, so passive resistance is mobilized on one face only.
The lateral pressure increases linearly with depth.
Wall friction is negligible.
Fig. 6.19 Free earth support
Fixed earth support piles
An anchored sheet pile is said to have free earth support when the depth of embedment is large and the bottom tip of the pile is fixed against rotation. Thus, there is change in curvature of pile, hence inflection point occurs. It is assumed that
The base of the pile is relatively fixed, so that there is a point of contra-flexure above the toe of the pile.
Passive resistance is mobilized on both faces (similar to cantilever pile).
The lateral pressure increases linearly with depth.
