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Abstract

This paper presents an advanced concept for numerical analysis of slope stability, which simultaneously analyzes the mechanical and hydraulic behavior of sandy material as a multiphase system depending on time (fully coupled flow-deformation analysis). The main goal is to understand the hydromechanical behavior and to show that through the infiltration of atmospheric water from intense rainfalls, the change of the parameters of the unsaturated soil is affected. The numerical modeling of slope with the finite element method is done using the mechanical and hydraulic models that define the constitutive dependencies of the main variables in the analysis. The stability analysis shows that the change of the saturation level begins immediately after the application of precipitation as a result of infiltration. After three hours of intense rainfall of 30 mm/h, the effect of moisture changing is up to a depth of 1.0 m, while the surface 50 cm is completely saturated. The greatest suction occurs at the part where the saturation is the smallest, 2.0 m below the top of the slope. The greatest reduction of suction occurs on the surface of the slope where the material is saturated by the influence of precipitation. The maximum deformations occur at the top of the slope. By reducing the strength parameters of the soil, the safety factor from the influence of precipitation decreases from 1.63 to 1.59.

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