Project Description


Terre Armee’s retaining wall solutions are recognized worldwide as the preferred economical solution to ordinary and extraordinary earth retention and load support requirements for railroads.

Our retaining walls, include Reinforced Earth® (MSE), T-Wall®, and TechWall™. For constructing tunnels and large culverts, Terre Armee offers the TechSpan®, and TechBox® solutions. All of these solutions are ideally suited to construct many types of railway structures supporting heavy freight rail, light passenger rail, and high-speed railways.

Terre Armée applications include:

  • Grade separations
  • Bridge abutments
  • Slope stabilization
  • Cut-and-cover tunnels
  • Arch bridges
  • Rockfall galleries

The inherent strength and flexibility of a Reinforced Earth® wall solution gives rail and transit stakeholders and their engineers and constructors powerful means for meeting structural, geotechnical and economical challenges with solutions for projects of all types, sizes and complexities. And by working with Terre Armee, all stakeholders can reduce uncertainty and improve their bottom-line results.

Vertical Retaining Walls

Under restrictive circumstances the most effective alternatives to MSE walls include T-Wall® (modular), and TechWall™ (counterfort) precast retaining walls. These Terre Armee solutions offer optimal solutions when designers are challenged with constraints related to highly restrictive rights-of-way, narrow in-fill clearances, obstructions behind the wall facing, etc.

Shored MSE Walls

When designers for railway widenings and twinnings encounter existing structures in close and encroaching proximity to new structures, then the TerraLink™ solution is to be considered. TerraLink™ is a shored Reinforced Earth® wall constructed in front of an existing structure or natural soil/rock, with narrow space between the two.

Cut and cover railway tunnels

TechSpan® arches are frequently used for the construction of railway tunnels in built earth embankments or in cut-and-cover conditions. The TechSpan® solution involves a strong soil-structure interaction, associating three-hinge prefabricated concrete arches to a structural backfill. The main advantages of TechSpan® are the material and structural quality, the rapidness of installation and the adaptability to the specific clear opening size requirements of each project.

TechSpan® is especially efficient when building the structures over existing rail tracks below traffic when closure during installation is either not an option or must be minimized. Reinforced Earth® is a logical complementary technique for the construction of the spandrel walls and tunnel portal walls.

Having similar functional properties as that of the TechSpan® solution, TechBox® is a state-of-the-art articulated precast concrete “box” system comprised of free standing walls and over bridging units.

TechBox® is an engineered site-specific solution. The structural design is modeled on an elasto-plastic soil model with soil stiffness and elasticity parameters in Finite Elements Method (FEM) analysis. This FEM analysis design follows a standardized precast process ensuring better quality and superior durability. Reinforced Earth®, TechWall™, and T-Wall® are complementary to the design for use as head walls and wing walls.




Terre Armee wall systems provide for significant load bearing, resistance to stray currents, resistance to vibrations, and resistance to deformation.



Overall turnkey installed costs are typically lower than alternative wall systems and maintenance requirements are minimal. Rapid installation reduces construction time compared to alternatives and can lead to earlier project completion.



Standardized manufacturing for components ensures consistent and uniform quality and appearance. Using relatively thin sections results in lesser consumption of concrete, steel, and land use, thus reducing carbon emission while minimizing environmental footprints.

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