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Evaluation of the influence of soil mechanical parameters on the position of rainfall thresholds for shallow landslides

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Abstract

A phenomenon of natural origin that is part of our landscapes is shallow landslides, which have been accelerated by human activity in pursuit of urban development, generating loss of human lives and multiple economic and social consequences. Around the world, physically based models have been used to evaluate the possible occurrence of landslides and to define rainfall thresholds. In this study, the physically based model TRIGRS was run to examine the effect of mechanical parameters (cohesion, friction angle, and unit weight of soil) on the position of rainfall intensity and duration thresholds in four watersheds of the Aburrá Valley (Colombia) by means of a sensitivity analysis. In addition, a first-order second moment (FOSM) analysis was performed in the La Liboriana watershed (Salgar, Colombia) to determine which of the mechanical parameters has the greatest influence on the safety factor. In the sensitivity analysis, the results showed a clear trend with increasing values of each parameter studied, marking changes in the threshold position upwards and to the right (most extreme rainfall conditions), in addition to increasing the initial and final duration of the threshold, as cohesion and friction angle increased. The opposite is true for soil unit weight, as the threshold curve moves downward and to the left, decreasing the initial and final duration. In the FOSM analysis, it was established that the parameter that has the greatest influence on the stability of the basin is cohesion, followed by the friction angle and with a lesser influence the unit weight of the soil. The rainfall intensity and duration conditions of each of the thresholds obtained and the variation of the parameters in the factor of safety using the methodology of this study allow a better understanding of the parameters analyzed and their effects on the spatial variability of shallow landslides.

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Acknowledgements

The authors would like to thank the support fund for undergraduate degree works Faculty of engineering of the University of Antioquia, the Infrastructure Research Group (GII), and Landslide Scientific Assessment (LandScient) for their support in conducting this research.

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Correspondence to María Fernanda Velásquez.

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The authors declare that they have no competing interests.

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Responsible Editor: Zeynal Abiddin Erguler

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Velásquez, M.F., Marin, R.J. Evaluation of the influence of soil mechanical parameters on the position of rainfall thresholds for shallow landslides. Arab J Geosci 15, 1678 (2022). https://doi.org/10.1007/s12517-022-10859-z

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  • DOI: https://doi.org/10.1007/s12517-022-10859-z

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