Secant Pile Walls - Information - Advantages - Disadvantages
Secant and tangent pile walls can be designed easily with DeepEX shoring design software. This section examines the advantages and disadvantages of secant pile walls design.
Figure: Anchored Secant Pile Wall in DeepEX software.
Secant pile walls are formed by constructing intersecting reinforced concrete piles. The piles are reinforced with either steel rebar or with steel beams and are constructed by drilling under mud. Primary piles are installed first with secondary piles constructed in between primary piles once the latter gain sufficient strength. Pile overlap is typically in the order of 3 inches (8 cm). In a tangent pile wall, there is no pile overlap as the piles are constructed flush to each other.
Figure: Typical Secant Pile Wall Section.
The main advantages of secant or tangent pile walls are:
1. Increased construction alignment flexibility.
2. Increased wall stiffness compared to sheet piles.
3. Can be installed in difficult ground (cobbles/boulders).
4. Less noisy construction.
The main disadvantages of secant pile walls are:
1. Verticality tolerances may be hard to achieve for deep piles.
2. Total waterproofing is very difficult to obtain in joints.
3. Increased cost compared to sheet pile walls.
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