What is the primary function of a grading layer in slope stabilization?

The primary function of a grading layer in slope stabilization is to prevent soil extrusion. This layer serves as a crucial component in stabilizing the slope by managing the distribution of forces acting on the soil. By effectively preventing soil extrusion, the grading layer helps maintain the integrity of the slope and minimizes the risk of erosion or landslides.

While enhancing water infiltration, providing structural support, and facilitating plant growth can be beneficial aspects of slope stabilization, they are secondary to the primary role of preventing soil from being displaced or extruded under the influence of gravity and surface water. The grading layer ensures that the underlying soil remains compacted and stable, which is essential for the long-term durability of the slope.