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Secant Pile Wall


Securing the foundations of a building or structure is often an important step in construction. Secant Pile Walls offer one such way to achieve this, using intersecting reinforced concrete piles.

In this blog post, you will learn about how secant pile walls are constructed and used for various purposes, their advantages and disadvantages compared with other solutions available on the market today.

For anyone looking for a more comprehensive understanding of secant pile walls and what they mean for your project, then look no further! With this blog editorial we’ll help shed some light on why leaning towards seemingly unconventional methods during your foundation works may just be worth it after all.

Secant Pile Wall Construction

Secant pile walls are constructed by repetitively installing reinforced concrete piles of various diameters and depths. The piles overlap each other in order to form a continuous wall for ground retention purposes.

For reinforcement of the secant wall, steel rebar or steel beams may be used during installation.The construction process involves creating two sets of parallel bored holes on either side of the excavation which is then filled with reinforced concrete to form perfectly interlocking “secant” circles around the excavation area.

This creates an overlapping pair of concentric rings at various points along the length (or depth) of the excavation that effectively functions as a single unified vertical sheet piled wall with its water tight integrity intact due to its continuous overlapping structure.

As these circular units increase in size so does their strength by varying degree allowing it sustain greater pressure from any external forces such as hydrostatic forces caused by water infiltrations or from lateral pressure applied by adjacent grounds soils or surrounding buildings/structures in case it is being installed closeby them.

Detailed Process of Piling in Secant Pile Walls

• Secant pile walls are constructed by alternating primary secondary and unreinforced piles that partially overlap.

Advantages of Secant Pile Walls


  • Secant pile walls offer increased construction alignment flexibility compared to other retaining wall designs.
  • They provide greater wall stiffness than sheet pile walls, allowing them to be used in a wide range of applications.
  • Secant piles can be installed in difficult ground condition such as areas with cobbles or boulders.
  • These walls are cost-effective for short-term water retention requirements.
  • The verticality tolerances for deep piles are better with secant piles than those of sheet piling methods.
  • They have more design options and can create shapes not achievable with diaphragm retaining walls.
  • Their lateral strength is significantly higher than that of diaphragm retaining walls.



Secant Pile Walls are an effective and reliable form of ground retention, providing stability in deep excavations as well as water tightness. They are constructed by intersecting reinforced concrete piles that can be installed using both drilling techniques or mud.

Secant pile walls offer a variety of advantages such as increased stability and cost efficiency compared to other forms of wall construction such as diaphragm walls or contiguous pile walls.

In addition, secant piled foundations require minimal maintenance throughout their lifetime which makes them ideal for a multitude of applications both underground and on the surface.

Overall, they are an excellent engineering tool for engineers today with proven results in ground reinforcement projects across various types of soil conditions.

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