Numerical study of the SILARD landslide in the Latian Dam watershed

The mountainous areas that cover most of Iran have always been threatened by slope instabilities and landslides. This phenomenon causes a lot of damage to the roads and lands used by humans in these areas every year. The predisposing factors of slope instability such as slope, soil layers and land use cause a lot of damage to natural resources such as rapid soil loss, destruction of agricultural lands, forests and roads. The purpose of this study is to reach the position, role and application of numerical modeling in predicting landslides. Therefore, for this purpose and in FLAC software environment, modeling and numerical analysis were performed by reverse analysis method for seismic landslide in Latian dam watershed and considering all geotechnical criteria (laboratory and field experiments and factors affecting its occurrence). The results were reviewed and evaluated.Reliability calculations for slope stability as well as measuring the displacement of assumed points on the slope, which was performed on accurate geometric modeling and application of physical and mechanical properties of soil layers; showed that the reduction of soil resistance parameters in the region for reasons such as weathering of soil layers and rainfall have been the main causes of this landslide in which the role of water in reducing resistance (severe reduction of adhesion and internal friction angle) and increasing shear force from The pore water pressure is very prominent due to soil saturation.