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Soil Nailing – Advantages And Disadvantages Of Soil Nailing

What Is Soil Nailing?

Soil Nailing is a technique used for soil improvement and stabilizing slopes. This technique is generally used to bring soil stability where landslides might be a problem. This process consists of reinforcing the natural ground with closely spaced steel or metal bars or sections (i.e nails) grouted in the pre-drilled holes and providing front face support.


Soil nail walls are generally constructed from top to the down. It is called soil nailing because it’s like having a nail being hammered into the soil where the nails are the steel bars.

Types Of Nails:

1. Driven nails

2. Grouted nails

3. Corrosion protected nails

4. Jet grouted nails

5. Launched nails.

Application:

1. Slope stabilization

2. Repair and reconstruction of existing retaining structures.

3. Roadway cuts.

4. Tunnel portals

5. Underbridge abutments.

6. Temporary excavation shoring.

Advantages Of Soil Nailing:

1. It is suitable for confined spaces with restricted access.

2. It uses less materials and minimum shoring.

3. Less noise, fewer traffic obstructions and less impact on surrounding areas. Thus environment-friendly.

4. It can be used on new construction, temporary structures, remodeling process as well as to repair the existing wall system.

5. This technique is flexible, relatively quick and easy to install.

6. No restriction on wall height.

7. Time-saving, cost-saving, requires less labors.

Limitations:

1. Not suitable to use in areas of a high water table.

2. In soils of low shear strength, very high soil density may be required.

3. Not recommended for permanent long term applications in sensitive and expansive soil.

4. Metal nail will corrode.

5. Sand and gravels might not be compatible with soil technique.

6. The soil might be overexposed prior to the installation of nail.

7. Requires specialized and experienced contractors.

Soil Nailing

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