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Home > News > Industry Information > Soil Nails Support Subgrade Settlement

Soil Nails Support Subgrade Settlement


The stability of subgrade infrastructure is crucial for ensuring the longevity and safety of transportation routes, especially roads and highways. Various natural factors, such as geographical, geological, climatic, and hydrological conditions, significantly influence subgrade settlement.

Factors Influencing Subgrade Settlement

1. Geographical Condition

- Terrain Influence: The topography of an area plays a pivotal role in subgrade design. Whether it's a plain or hilly region, drainage considerations and water table depth must be factored in to prevent issues like slope slides and collapse.

2. Geological Conditions

- Rock Characteristics: The variety, weathering degree, layer attributes, and joint development of rocks impact subgrade stability. - Layer Stratification: The inclination, thickness, and strike of geological layers contribute to the overall stability of the subgrade.

3. Climate Conditions

- Temperature and Humidity: Seasonal variations affect subgrade water temperature conditions, and climate is influenced by terrain features, further impacting stability. - Rainfall and Frozen Depth: Precipitation, freeze-thaw cycles, and evaporation rates contribute to subgrade water dynamics.

4. Hydrological and Hydrogeological Conditions

- Surface Runoff and Flood Stage: Hydrological conditions, including runoff and flood stages, influence subgrade stability. - Underground Water Movement: Hydrogeological factors like underground water level and movement affect the soil mass and subgrade stability.

Introduction to Soil Nailing

Soil nailing emerges as a crucial technique to address subgrade instability. This method involves reinforcing the existing ground through the use of steel tendons, encapsulated in a cement-grouted body. The primary goal is to increase normal loads and shear strength on potential sliding surfaces. Originating in France, soil nail technology has evolved to become a common methodology for stabilizing soil masses.

Key Aspects of Soil Nailing

1. Application

- Excavated Soil Face and Landslide Zone Stabilization: Soil nailing is effective in stabilizing excavated soil faces and landslide-prone areas, offering an economical solution.

2. Development History

- Evolution: Initially used for a permanent retaining wall in soft rock in France, modern soil nailing techniques date back to 1972 near Versailles. - Applications: Soil nailing has become widely adopted for stabilizing soil masses in various applications.

3. Mechanics of Soil Nailing

- Tensile and Compressive Forces: Soil nails primarily work in tension, though bending/shear forces are considered in specific circumstances. - Stabilization Effect: Nail reinforcement improves stability by increasing normal forces and reducing driving forces along potential slip surfaces.

4. Construction Facing

- Shotcrete Reinforcement: A construction facing, usually shotcrete reinforced by welded wire mesh, complements soil nailing to enhance stability.

5. Installation Orientation

- Horizontal or Sub-Horizontal Installation: Nails are installed parallel to the major tensile straining direction in the soil to minimize tensile forces and maximize resisting potential.

6. Versatility

- Permanent and Temporary Applications: Soil nailing can be applied for both permanent and temporary stabilization needs, providing flexibility in construction projects.

The Role of Sinorock in Soil Nailing

Sinorock has established itself as a reputable consultant for executing and designing soil nailing techniques for stabilizing natural or manmade soil slopes. With a track record of successful applications in challenging environments, Sinorock offers expertise in employing soil nailing for subgrade stabilization.

Specialized Soil Nailing Tools by Sinorock

When precision is paramount, Sinorock's self-drilling soil nails come into play. Available in a range of sizes to accommodate diverse project requirements, these tools epitomize quality and reliability. Sinorock maintains a well-stocked inventory to ensure prompt availability of products, thus facilitating the seamless completion of construction projects.


Subgrade stability is a multifaceted challenge influenced by various natural factors. Soil nailing emerges as a versatile and effective solution, providing a means to reinforce and stabilize soil masses. Sinorock's expertise in executing soil nailing projects further reinforces the viability and reliability of this technique. As infrastructure development continues, the role of soil nailing in ensuring stable and durable subgrades becomes increasingly indispensable.