Effects of the size of particles on rainfall-induced slope instability in granular soils

Ahmad-Adli, Mohammad
Huvaj, Nejan
Toker, Nabi Kartal
Rainfall-triggered landslides is a common natural hazard with significant consequences all over the world. Most available methods for predicting rainfall-triggered landslides are based on regional statistical data of past slope failures and rainfall records rather than a physically based model that takes the mechanism of the problem into account. Stability of slopes in unsaturated soils is mainly affected by suction distribution, which influences seepage and shear strength. Soil-water characteristic curve (SWCC) plays a critical role in suction distribution of the soil. This parametric study investigates the effects of changes in the size of particles, and related changes in SWCC, on the stability of an unsaturated slope under rainfall. A numerical model has been created for a real flume experiment, and a sensitivity study has been carried out. Results show that changes in the size of particles, and related changes in SWCC, cause significant changes in the stability of the slope, the time to failure, and triggering-rainfall intensity-duration threshold. This study could be useful for early warning for rainfall-triggered landslides.


Effect of Unsaturated Soil Properties on the Intensity-Duration Threshold for Rainfall Triggered Landslides
Kenanoğlu, Melih Birhan; Ahmadi-Adli, Mohammad; Toker, Nabi Kartal; Huvaj Sarıhan, Nejan (Teknik Dergi, 2019-03-01)
Rainfall triggered landslides are one of the most common natural hazards in many countries throughout the world, as well as in Turkey. This study investigates the effect of unsaturated soil properties on landslide-triggering rainfall intensity-duration threshold. In addition to the time to failure, the suction (negative pore water pressure) distribution in the slope, the shape and depth of the failure surface are also evaluated. Properties of soil-water characteristic curve which affect the distribution of ...
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Rainfall threshold to trigger landslides in unsaturated soils: A laboratory model study
Ahmadi-adli, Mohammad; Huvaj Sarıhan, Nejan; Toker, Nabi Kartal (2017-09-22)
Rainfall triggered landslides are common natural hazards with significant consequences all over the world. In this study, laboratory model tests are conducted which aims to obtain the rainfall intensity-duration threshold to trigger landslides in a slope composed of unsaturated soil in a flume setup. Sixteen laboratory model tests are conducted to obtain the rainfall intensityduration threshold. Some of the conclusions in this study are: (1) rainfall intensity-duration (I-D) thresholds that would trigger a ...
Citation Formats
M. Ahmad-Adli, N. Huvaj, and N. K. Toker, “Effects of the size of particles on rainfall-induced slope instability in granular soils,” 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40807.