The stability of slopes is the one significant topic of geotechnical engineering. Slopes can be classified according to their geometries, mechanisms, and origins. The stability of slopes is affected by many factors such as soil type, density, water content, fine content, external load, rainfall intensity, etc. In addition, slope stability directly affects the design process of civil engineering applications. The slope stability behavior can be evaluated by back stability analysis, laboratory experiments, and field tests. These methods have some advantages and disadvantages over each other. Laboratory modeling stands out with its ability to keep external conditions under control and to measure deformations precisely. In this study, slope models were created with the effect of precipitation and external loading under laboratory conditions. Models were created with 45 56, and 72 angles using noncohesive coarse-grained soil. In order to investigate the effect of fine content on stability, different mixtures with various high plastic clay content were prepared. The basic engineering properties of the soil mixtures were determined with laboratory experiments such as direct shear, standard compaction, consistency limits, and particle size analysis. Incremental surcharge loads were placed on the crest of the slope models and surface deformations were recorded under the influence of precipitation. Laboratory model results showed that the fine content has a non-negligible effect on stability. In slopes modeled under the same conditions, the increase in the fine-grain ratio may deteriorate the stability. Moreover, fine-grained clays have higher water retention capacities and increase the weight of the slope body, and decrease the factor of safety.
Anahtar Kelimeler: Slope Stability, Rainfall Intensity, Load - Settlement Behavior Laboratory Model
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