The study of influence of geological factors on landslide occurrence in Zaman-Abad region, south of Hamedan

Understanding geological factors affecting landslides in order to understand their mechanisms and methods of stabilization is of utmost importance. In this research using field checking 10 stations were identified and during laboratory tests the mineralogical composition, physical and mechanical properties of slide components were determined. Then, using slide ver5.014 (2004) software static and dynamic stability were analyzed. Slide forming soils are sediments transported along channels that have been diagnosed in seven layers. The seven layers of the soil based on Unified soil classification are four layers namely; SM-SP, SW, SC, SP-SM, and three layers of CL. Clay minerals in the clay layer (CL) are Illite, Kaolinite and Montmorillonite. The most important factors in the occurrence of slides are clay mineralogical composition, toe crusher gradient, active faults, material heterogeneity of slope, and creep. According to the analysis conducted, heterogeneous slopes are prone to rupture. Stations I and IV are the most heterogeneous which represent the minimum safety factors in static mode. Except for stations 5, 9, and 10 other stations have a safety factor of less than one in a dynamic mode.