JTS Geotechnical Solutions – Soil nailing

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RETAINING WALLS

JTS Geotechnical Solutions Ltd

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Retaining walls

A stabilised slope becomes a Retaining wall when it exceeds an angle of 70 degrees.
Retaining walls are structures designed to retain soil to a slope that it would not naturally keep to (typically a very steep over 70 degree slope, near-vertical or vertical slope). They are used to support soils between two different elevations often in areas of terrain possessing undesirable slopes or in areas where the landscape needs to be shaped severely and engineered for more specific purposes such as building plots on sloping ground or roadway overpasses. .

New Soil Nailed Retaining Walls:

Soil nails can be used with a slope facing to form a relatively rigid wall used for supporting soil laterally so that it can be retained at different levels on the two sides as detailed on our Soil Nailing page.

Stabilising of Existing Retaining Walls:

Soil nails can also be used to stabilise or repair existing retaining walls, where it is preferable to leave the existing structure in place rather than remove and rebuild it. 

This has the advantage of avoiding the cost of removal and the need for temporary support whilst a new wall is built. If the requirement is to remove and rebuild a wall we can design and install a soil nailed solution to provide the temporary works required to stabilise the exposed slope in the short term. 

Stabilising of Failed Retaining Walls:

More efficient uses of soil nails are:

    • Provision of permanent support to an existing wall by coring through the wall and installing soil nails to anchor the existing structure
    • Installation of soil nails to provide both the temporary support needed whilst a new wall facing is constructed whist also forming a permanent stabilisation approach for the existing slope.

Where an existing wall (concrete, stone or brick) is in need of additional support we can design and install a soil nailed or anchor solution to provide permanent support to enable the existing wall to be left in place. The existing wall will be cored to allow for the installation of the soil nails / anchors and dependant on the design requirements, location and aesthetics required, surface mounted bearing plates, recessed plates, structural mesh and or an additional facing can be installed to the face of the existing wall as well as the installation of weep-holes as required to provide permanent drainage.

Where a wall or section of wall has already failed a soil nailed solution can provide permanent stability to the slope material in the failed section and the soil nailed bar can be extended to connect to a new/rebuilt wall facing. The soil nails providing the structural support to the bank. The soil nail solution can also be extended to stabilise adjacent sections of wall, which may be at risk of future failure.

This is an ideal solution where an insurance claim may be involved and we have extensive experience in liaising with insurers and loss adjusters in these situations.

A soil nailed approach with the installation of a surface facing has also been successfully designed and utilised to stabilise failing timber crib walls and provides an effective solution for residential areas where space may be limited.

Who we collaborate with

JTS Geotechnical Solutions Limited work with businesses of all sizes, from homeowners to insurers and businesses small to large. We will liaise with any other designers, contractors, organisation or services providers involved within a project, as required, to establish the best design and installation method for your project.