Soil Nailing Installation

Soil nailing is an earth retention technique which uses grouted tension-resisting steel or fibreglass reinforced nails.

content-45

The use of Soil Nails can be employed for permanent or temporary support.

Soil nailing is a specialist technique for earth retention, erosion control, and the stabilisation of slopes, construction areas, tunnels, deep cuts, and repairs to existing structures.

Soil nails are a strong and reliable solution to soft, unstable earth. Used in conjunction with TRM (erosion matting), soil nails can stop loose soil from shifting and prevent further erosion. This is crucial for infrastructure and civil construction projects on a strict timeline or contract.

Soil nail installation must be executed by a fully trained and experienced ground stabilisation staff in order to be 100% effective. A collaboration of techniques and specialist materials is required to evaluate the ground pressure and assess which soil nails are most suitable for the ground conditions.

Ground Stabilisation Systems is one of the most experienced ground engineering specialist in Australia. Highly regarded for our geotechnical services and engineering solutions for commercial, civil, mining, and construction industries, we will approach your project with expertise and professionalism.

Get in touch with us for more information about our soil nail installation services.

How does it work?

Soil nailing uses multiple types of materials consisting of steel, fiberglass and even hollow bars made up to penetrate the surface and stabilise unstable ground conditions. Soil nailing provides strength and retention to soft soil and also promotes regrowth in those areas.

At Ground Stabilisation Systems, we only use the highest quality soil nails and utilise the latest innovations in ground stabilisation for our clients. Detailed investigation and planning, along with the latest technology, ensures every project provides a stable, long term solution to even the most demanding slopes and unstable sites.

Soil nailing equipment can be small enough to easily negotiate areas with restricted access. For existing steep slopes, the soil nails can be installed from Telehandlers/EWP’s and crane-suspended working platforms and even by means of position drills with helicopters. Soil nails can also be installed directly beneath existing structures adjacent to excavations and used to stabilise retaining walls or existing fill slopes.

Care should be exercised when applying the system underneath an existing structure. Ground Stabilisation Systems uses extensive 3D modelling to avoid conflicts between soil nails and other earth retention systems on complex projects that involve the use of multiple techniques and to ensure the safety of buried utilities.

Some investigation and analysis are required to determine whether soil nail installation is the right solution to your ground stabilisation problems. Considerations include:

  • The condition of the ground
  • The suitability of other systems like ground anchors and geosynthetic materials
  • Costs and budgetary requirements.

While soil nails are versatile and can be used for a wide variety of soil conditions, Soil types like clay, glacial soils, sand, and gravel are well suited for soil nail installation. Soil nails can also be used on weathered rock so long as the weathering is even and without any weak planes.

Soil types with a high groundwater table, soft fine-grained soils, corrosive soils, loose granular soils, and ground exposed to repeated freeze-thaw action are generally not suited to soil nail installation.

For the team at Ground Stabilisation Systems, we will also need to consider the design and the capability of soil nails to complete the task at hand. These considerations include:

  • Ground properties and soil type
  • Nail length, diameter, and maximum force
  • The inclination of the soil nails
  • Vertical and horizontal spacing of the soil nails
  • The strength limit i.e. where potential failure or collapse could occur
  • Drainage
  • Wind and hydrostatic forces.

There is a wide range of benefits to soil nail installation:

  • The equipment is small enough to use in areas with restricted access. Soil nails can even be installed from crane-suspended working platforms for steep slopes like bluffs and existing failing retaining walls.
  • Soil nails are a fast and cost-effective solution for excavation support. Generally, soil nail walls are more economical than concrete gravity walls and ground anchor walls. Soil nail installation is also more cost-effective for sites with remote access because the equipment required is smaller and readily mobilised.
  • Soil nails are less disruptive to traffic and have a smaller environmental impact compared to other construction techniques like drilled shafts and soldier pile walls.
  • Soil nail walls are flexible and can accommodate differential movements. They have also performed well during seismic events like earthquakes.

However, even the most effective system have their limitations. For soil nail installation, these include:

  • Utilities behind the soil nail wall will create restrictions to the location, inclination, and length of the soil nails. This includes some kinds of communication lines like optic fibre running adjacent to the soil nails.
  • Soil nails are not suited to areas where large amounts of groundwater seep into the excavation. Soil nails require a temporarily unsupported excavation face during construction.

To reduce groundwater in a soil nailing installation project, a sub horizontal drainage system may be inserted once the nails are in place. This involves a PVC drainage pipe or synthetic drainage mat that is placed vertically between the nail heads and extends to the wall base while also connecting to a footing drain.

Drainage is often required to avoid flooding and other damage in civil engineering and construction projects.

This service is applicable to various terrains and locations.

Over 20 years of soil nail installation expertise.
icon-photosFeatured Projects
View All

At GSS, we pride ourselves on our certified management systems, as supported by the standards and awards we have achieved. Our focus is on delivering the highest quality ground engineering services for every project we undertake. To achieve this, safety and efficiency are at the forefront of all operations that GSS are involved in.