TerraTrel® is a lightweight mechanically stabilized earth (MSE) wall structure constructed using a durable steel wire mesh facing.
Placed and compacted backfill behind the wire facing is layered with either high-adherence (HA) steel strips or welded wire bar mat elements. These elements are structurally connected to the wire facing creating a Reinforced Earth® structure capable of supporting heavy loading and tolerant to settlement and deformation while remaining operable for all the same purposes as concrete clad MSE walls.
See also Geotrel™ for wire faced MSE using geosynthetic soil reinforcement.
Applications for TerraTrel®
TerraTrel® is used to build both permanent and temporary civil structures. This includes both sloping and vertical retaining walls for bridge abutments, phasing and staging walls, equipment platforms, and temporary pre-load embankments.
> Industrial environment
Common applications include building crusher pocket walls, industrial platforms, and tunnel collars walls.
> Natural risks mitigation
Terratrel® barriers are well known for constructing rockfall and avalanche protection. These are reliable structures that permit both high energy levels and multiple impacts to be controlled.
> Landscaping with steep slopes and terraces
Terratrel® offers owners and developers an attractive alternative to concrete methods to building permanent residential or urban retaining wall and vegetated slope applications.
For phasing of grade separation (particularly bridge construction), this solution allows the grade to be raised on one side while traffic flow is maintained on the existing lower passage. Once the raised portion is completed, traffic is diverted and the balance of the roadway or bridge is raised to desired grade.
Staged construction is often done when significant differential settlement is anticipated (>760mm). Two-stage construction of MSE walls:
- The Terratrel® wall is initially constructed with a flexible wire facing and allowed to settle (with or without surcharge).
- Following settlement, a permanent precast concrete facing is attached, leaving a void between the concrete and wire facing that is filled with either soil, crushed stone or flowable fill.
Our soil reinforcements have been designed and tested to optimize the pull-out and tensile capacity for various types of backfill. The reinforcing strips are patterned with “ribs” to optimize bonding with the compacted backfill. Our welded wire bar mats are used for efficiency in low-height walls or lightweight backfill situations where tension is low and extra pull-out capacity is needed.
Corrosion protection for all components in the form of galvanization is included when necessary to achieve a design life of 75 years, 100 years, or more. For temporary walls, using black steel is an option.
When building permanent structures, we recommend that a column of rock facade (normally 150 to 250 mm wide) be placed just behind the wire mesh facing to control erosion. A separation geotextile is installed behind the facade and is protected from UV light. This alternative provides a permanent structure having an appealing look resembling an architectural stone finish.