Secant walls provide a deep foundation cutoff system and lateral support through overlapping drilled shafts that form a continuous wall. Typically every second shaft is reinforced with a steel beam or reinforcing cage and the intermediate shafts are filled with lean concrete. When secant piles are used to shore a circular shaft excavation, vertical steel reinforcement is typically unnecessary, because the secant piles form a concrete compression ring. Secant pile walls are effective at retaining saturated soils, preventing water seepage, and preventing loss of retained soil during excavation.
Secant Pile Wall Applications:
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