Sensitivitätsanalyse der unterschiedlichen Einflussfaktoren auf numerische Untersuchungen von Hangrutschungen

Abstract

AbstractCalculation approaches, shear strength approaches, material parameters and external influences have a significant impact on the results of slope stability analyses. This influence can be quantified as influence on the safety factor in sensitivity analyses. As expected, a lower shear strength of the soil or a higher groundwater flow through a slope lead to lower factors of safety. In the two case studies considered here, it is evident that the parameter with the highest sensitivity of the safety factor is not unique. This most influencing parameter depends on the boundary conditions and the geometry of the landslide. In addition to the safety factor, the above parameters also strongly influence the geometry of the failure mechanism. Here, for example, different permeability coefficients for stratified soil and the consideration of a nonlinear shear strength criterium show significant changes in the failure geometry. Therefore, the modelled failure geometry has to be considered in addition to an certain safety factor for the validation of a landslide modelling.