Evaluation of Slope Stabilization by Vegetation Reinforcement: Modelling Aspects

Abstract

In geotechnical engineering, slope stability is one of the main issues. In order to strengthen the safety factor of slopes against failure, this study focuses on the numerical evaluation of planting (vegetation) reinforcement as an environmentally beneficial strategy. For this purpose, the MohrCoulomb failure model incorporates the apparent root cohesion—a physical contact between the vegetation root and the soil structure. Thus, utilizing parametric investigation, both the numerical and limit equilibrium methods are used to assess the impacts of root cohesion (Cr) and root depth (Zr) corresponding to different types of plants and trees on the safety of various slopes. The considered Cr and Zr values are (0,5,10,15,20, and 25 kPa) and (0,0.5,1.0,1.5 and 2.0 m), respectively. These values are looked at in a variety of instances involving slopes with slope angles (β°) of 18.4°,26.6°,33.7°,39.8°,45°, and 55°. Additionally, the consequences of slope sections that might become vegetated are simulated in various circumstances, and the outcomes are contrasted with a root-free strategy. The findings show that increasing root cohesiveness and depth improves the slope's stability. Even in scenarios with steep slopes (i.e. β>45°)., this rise is noteworthy. According to the results, scenarios where vegetation is integrated onto the slope's surface have a higher safety factor than crest and toe covered zones. Furthermore, there is no evidence of any impact from the vegetation cover in the toe region.

Keywords

• slope stability;
• vegetation;
• soil reinforcement;
• numerical modelling;
• parametric study