The main objective of this paper is to discuss the experimental and theoretical approaches developed by different researchers in order to understand and to evaluate the soil geosynthetic interaction under different loading conditions. In the paper, the soil-geosynthetic interaction in pullout, direct shear, and inclined plane tests under both static and cyclic loading is analyzed based on the different theoretical and experimental results carried out by the authors and also available in literature. For each type of test, the factors affecting test results and soil-geosynthetic interface behavior, the theoretical model developed to predict the interface resistance and mobilized friction, and the relevance of the interface parameters obtained through the different tests in the design and performance of geosynthetic reinforced earth structures are discussed in detail.

The paper shows the application of heuristic methods to assess qualitatively the landslides susceptibility of an area located at the end of the flowslides path. Numerical analyses have been performed to study the flowslide propagation phase and landslides susceptibility maps of the studied area have been obtained. Focusing the attention on a zone located at the end of the flowslides path, qualitative susceptibility analyses have been applied using two heuristic methods. The comparison of obtained results highlighted how heuristic methods strongly depend on the judgement of the person carrying out the analysis