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Secant Piles Wall

Photography of workers installing secant pile walls at a construction site.


Looking for an efficient way to retain ground before excavation? Secant pile walls provide the answer to your problem. These intersecting reinforced concrete piles not only work as support systems but also ensure water tightness due to their overlapping nature.

Dive into this blog and discover how secant pile walls revolutionise construction projects, potentially saving you time and money too! Ready to explore its advantages?.

Secant Pile Wall Construction

Construction workers building secant pile wall in bustling atmosphere, captured in high-quality photography.

Secant pile walls are constructed using a combination of primary piles and secondary piles, which intersect each other to form a continuous interlocking barrier.

Definition and purpose of secant pile walls

Secant pile walls provide strong, durable barriers in the ground. They consist of overlapping concrete cylinders, drilled vertically into the earth and linked by a capping beam to form an uninterrupted barrier without gaps.

Reinforcement comes from either steel rebar or beams within each pile, augmenting their strength even more. Primarily, these walls serve as retaining structures for soil retention before excavation starts on construction sites.

Their robust nature makes them excellent alternatives to diaphragm walls for any project seeking firm support against earth pressure and groundwater intrusion.

Construction process and materials used

Secant pile walls are built using a precise and meticulous construction process with specific materials.


  1. The initial step involves drilling the primary piles or ‘soft’ unreinforced piles.
  2. A mixture of cement and bentonite forms the primary piles.
  3. These non – reinforced piles are allowed to harden slightly before secondary or ‘firm’ piled are placed.
  4. The secondary, reinforced piles intersect with the primary ones, creating a steady interlocked wall system known as secant pile wall.
  5. Reinforcements for these piles usually consist of steel rebar or beams for added strength and stability.
  6. Piling guide walls can be improved by using sacrificial guide wall formers, ensuring accurate construction.
  7. This process guarantees an efficient excavation support system which aids in various construction projects.


Benefits and advantages of secant pile walls

Secant pile walls offer various benefits which make them a popular choice in construction projects. They conform to the surface of the ground, ensuring no sagging over time. This adaptability allows for increased alignment flexibility during construction, unlike other wall options that might have strict installation requirements.

Secant piles also boast sturdy wall stiffness compared to sheet piles, enhancing their durability and lifespan.

Importantly, these types of walls remain unperturbed by challenging ground conditions like cobbles or boulders – they can be installed with ease irrespective of site challenges. While providing impeccable service and convenience, secant pile walls are often cost-effective solutions for short-term water retention on construction sites.

The functionality and affordability combined show why this technique is valued amongst professionals in the field.

Applications of Secant Pile Walls

Construction site with secant pile wall installation, varied people, and landscapes.

Secant pile walls are commonly used for excavation support in construction projects, slope stabilization in geotechnical engineering, and various other applications.

Excavation support in construction projects

Secant pile walls play a crucial role in providing excavation support in construction projects. These walls are designed and installed to prevent soil collapse during deep excavations, ensuring the safety of workers and surrounding structures.

By creating a strong and stable barrier around the excavation area, secant pile walls keep the soil intact, preventing potential cave-ins or structural failures. This temporary support system is especially beneficial in urban environments where nearby buildings or utilities need to be protected during construction activities.

Secant pile walls offer an effective solution for maintaining stability throughout the excavation process, making them an essential component of many construction projects.

Slope stabilization in geotechnical engineering

Secant pile walls play a significant role in slope stabilization within the field of geotechnical engineering. These walls are constructed by overlapping piles, forming robust and stable structural or cutoff walls.

Their primary purpose is to provide stability and support to slopes, preventing soil erosion and potential landslides. The performance of secant pile walls has been extensively studied, especially in medium and dense sand conditions.

Research findings have shown that these walls possess remarkable structural strength as well as overall stability features, making them an effective solution for slope stabilization projects.

In addition to their strength and stability advantages, secant pile walls offer several other benefits in geotechnical engineering applications. They can help control groundwater flow and achieve water tightness in areas where moisture infiltration could be problematic.

Furthermore, due to their versatility and adaptability, secant pile walls can be used for various types of slopes, including steep embankments or hillsides with complex geological formations.

Other common uses and related projects

Secant pile walls have a wide range of applications in various construction projects. Here are some common uses and related projects that showcase the versatility of secant pile walls:


  1. Basement Construction: Secant pile walls are commonly used to create watertight basements in residential, commercial, and industrial buildings. The overlapping piles provide excellent groundwater control and structural stability.
  2. Bridge Abutments: Secant pile walls are often employed as abutments for bridges, providing support and preventing soil erosion around the bridge structure. This application ensures the longevity and safety of the bridge.
  3. Deep Excavations: When excavating deep trenches or constructing underground structures such as tunnels or subway stations, secant pile walls serve as temporary shoring to prevent cave-ins and maintain stability during excavation.
  4. Land Reclamation: Secant pile walls can be utilized in land reclamation projects to stabilize slopes and prevent soil erosion. By creating a solid barrier, these walls ensure the stability of newly reclaimed land.
  5. Flood Protection: In flood-prone areas, secant pile walls can be used as flood barriers to protect infrastructure from water damage. They act as an effective defense against floodwaters by providing a strong containment system.
  6. Environmental Protection: Secant pile walls are also employed in environments that require pollution containment or prevention, such as waste management facilities or contaminated sites. These walls effectively isolate hazardous substances from surrounding areas.



In conclusion, secant pile walls are a versatile and effective solution for ground retention in construction projects. Their intersecting reinforced concrete piles provide stability and water tightness, making them ideal for excavation support and slope stabilization.

The use of secant pile walls offers numerous benefits, making them a popular choice among piling enthusiasts in the industry.

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