Secant or Tangent Piles. Secant or tangent piles are columns constructed adjacent (tangent) or overlapping (secant) each other to form structural walls that resist lateral pressures and groundwater inflow for bulkhead support, earth retention, groundwater control, or slope stability. Credits to @haywardbaker Follow us! @engineeringandarchitecture . . . #soilmechanics #columns #pile #wall #structuralwall #lateralpressure #groundwaterinflow #inflow #waterworks #structuralworks #bulkhead #support #

🔔 🔔 🔔 Secant pile walls are constructed by drilling and overlapping primary (unreinforced) and secondary (reinforced) piles to form a continuous retaining structure. They provide excellent groundwater control and structural stability in deep excavations, particularly for shafts, basements, and tunnel portals. The secondary piles are installed between the primary ones, cutting slightly into them to ensure full contact and minimise permeability. https://tunnel.engineering/courses/detail/tunnel-

TBM breakthrough into a secant pile reception shaft. When a Tunnel Boring Machine (TBM) is scheduled to break through into a secant pile or diaphragm wall reception shaft, careful consideration must be given to the design and preparation of the shaft. A critical aspect is the incorporation of a soft eye in the shaft wall, which is an area with specific reinforcement arrangement to facilitate the TBM's arrival. This soft eye is engineered to withstand the pressures of tunnelling while allowing th