Sheet piles are used for retaining soil, for water front structures, for coffer dams etc. Unlike retaining walls sheet piles provide flexibility in use, that means these can be reused or can be used as temporary structures.
They are made of timber, steel, RCC etc.
Types of sheet piles:
1. CANTILEVER SHEET PILE:
Stability is due to lateral passive resistance of the soil only. Suitable for small depths (say 5 m)
2. ANCHORED SHEET PILE:
Anchor rods are provided to increase stability. Total stability is due to lateral passive resistance and due to the anchor rod.
- An anchored sheet pile is usually called "BULKHEAD'.
- Suitable for large depths (10 to 12 m)
Anchored sheet piles are of two types:
- Free-earth support pile
- Fixed-earth support pile
1. Free-earth support piles:
An anchored sheet pile is said to have Free earth support 'when the depth of embedment is small and the pile rotates at its bottom tip. No point of contraflexure (or inflection point) in the pile.
2. Fixed-earth support piles:
An anchored sheet pile is said to have 'Fixed earth support when the depth of embedment is large. (Here the bottom tip of the pile behaves as fixed). There is a point of contra flexure.
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