Author(s): Bonomelli Riccardo; Marco Pilotti

Linked Author(s): Marco Pilotti

Keywords: Slope stability; Soil slip; Factor of safety; Hydrological modelling; Janbu method

Abstract: Landslides in mountain areas can be a direct hazard for underlying settlements and provide sediments for debris flow along the drainage network. Accordingly, the identification of unstable areas is a fundamental issue for hazard mapping. Considering soil instability at the watershed scale, this problem has often been studied using the Infinite Slope (IS) assumption coupled with suitable hydrologic hypothesis. However, there is evidence in the literature, that the IS assumption, that considers single cells stability, becomes increasingly inadequate with growing resolution of the elevation model. In this contribution we present some preliminary results obtained with an original improvement of the Janbu's method. We show that the proposed method is systematically better than the local IS prediction for a set of controlled simple test cases that have been proposed in the geotechnical literature. Lastly, we show an application of the introduced methodology considering a simple idealized slope.

DOI: https://doi.org/10.3850/978-90-833476-1-5_iahr40wc-p0185-cd

Year: 2023