Effect of rainfall ıntensity on the stability of unsaturated slopes of silty clay soils of Kazan, Ankara, Turkey

Rainfall-induced landslides are among the most common natural hazards in many countries. Especially in unsaturated soils, rainfall is one of the basic causes of slope failure. This stems from the suction zone, where the negative pore-water pressure occurs in unsaturated soils. This zone causes an in...

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Bibliographic Details
Published in:Arabian journal of geosciences 2022, Vol.15 (9), Article 894
Main Authors: Erdağ, Ahmet, Sinan Işık, Nihat
Format: Article
Language:English
Subjects:
Clay
Clay soils
Earth and Environmental Science
Earth science
Earth Sciences
Groundwater
Groundwater levels
Hydrostatic pressure
Infiltration
Landslides
Matric suction
Original Paper
Pore pressure
Pore water
Pore water pressure
Rain
Rainfall
Rainfall infiltration
Rainfall intensity
Safety
Safety factors
Shear strength
Slope stability
Slopes
Soil
Soil stability
Soil strength
Soils
Stability
Stability analysis
Unsaturated soils
Water pressure
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Summary:Rainfall-induced landslides are among the most common natural hazards in many countries. Especially in unsaturated soils, rainfall is one of the basic causes of slope failure. This stems from the suction zone, where the negative pore-water pressure occurs in unsaturated soils. This zone causes an increase in the shear strength of the soil. After rainfall events, infiltration of the rain causes reduction of the suction and increase groundwater level. Then, the pore water pressure becomes positive and slope failures occur in unsaturated soils. This study examines the slope failure occured due to rainfall intensity and duration threshold on the unsaturated soil slopes in the Ankara province of Turkey. Stability analyses of unsaturated soil under the effect of rainfall infiltration were performed using Seep/W and Slope/W modules of the Geostudio software suite. The study shows that the matric suction pressure is an important parameter that must be considered for stability analyses. The study reveals that there is a non-linear relationship between rainfall infiltration and the factor of safety. Besides, it was determined that the changes in pore water pressure and infiltration significantly affect the safety factor of safety.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-022-10174-7