Soil nails are a cost effective method for long or short term stabilisation of steep existing or proposed slopes. The stability of the slope is increased with the installation of steel or glass fibre threaded soil nails placed into pre-bored holes or simultaneous drilling and installation techniques. The end results along with the correct drainage significantly reduce the chances of a landslide or other ground movements.
Whether it’s for roadway cut excavations, slope stabilisation or retaining wall support, soil nails are a versatile and practical form of earth retention used to prevent horizontal movement. Aarsleff Ground Engineering proves time and time again that Soil nailing is a proven technique for the construction of new steep cuts or the strengthening of an existing slopes
We take pride in being fully proactive with our clients to offer a one-stop design and build soil nail and ground anchor solution to enable our clients to rest easy in the knowledge that their contract is in safe hands. In certain conditions, soil nails offers a viable alternative from the viewpoint of technical feasibility, construction costs, and construction duration when compared to ground anchor walls, which is another popular top-to-bottom retaining system.
Soil nail walls are particularly well suited to excavation applications for ground conditions that require vertical or near-vertical cuts and have been shown to be particularly well suited for the following temporary or permanent applications:
- Roadway cut excavations.
- Road widening under an existing bridge end.
- Repair and reconstruction of existing retaining structures.
- Temporary or permanent excavations in an urban environment.
Soil nail advantages
Soil nail walls exhibit numerous advantages when compared to ground anchors and alternative top-down construction techniques. Some of these advantages are described below:
- Less disruptive to traffic and causes less environmental impact compared to other construction methods.
- Provide a less congested workplace, particularly when compared to braced excavations.
- There is no need to embed any structural element below the bottom of excavation as with soldier beams used in ground anchor walls.
- Soil nail installation is relatively rapid and uses typically less construction materials than ground anchor walls.
- Nail location, inclination, and lengths can be adjusted easily when obstructions (cobbles or boulders, piles or underground utilities) are encountered. On the other hand, the horizontal position of ground anchors is more difficult to modify almost making field adjustments costly.
- Soil nailing is advantageous at sites with remote access because smaller equipment is generally needed.
- Soil nail walls are relatively flexible and can accommodate relatively large total and differential settlements.
- Measured total deflections of soil nail walls are usually within tolerable limits.
- Soil nail walls have performed well during seismic events owing to overall system flexibility.
- Soil nail walls are more economical than conventional concrete gravity walls when conventional soil nailing construction procedures are used.
Soil nail walls are typically equivalent in cost or more cost-effective than ground anchor walls when conventional soil nailing construction procedures are used.
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