Role of Sedimentary Changes and Groundwater Level in Liquefaction of the South of Tehran

Tehran city located on the large alluvial fans in recent decades due mainly to the north of the Alborz mountain range located south east and west has trend of industrial development and population growth spawned the development high buildings also in southern parts of has created change the size sediments from north to south and also the water level underground in conditions, event, earthquake-possibility to create phenomenon, Liquefaction take probable, makes. This paper has attempted to examine the geology of the site with the use of boreholes and geotechnical characterization of sediments and soil mechanics changes in groundwater level as well as liquefaction potential was evaluated results showed that different parts of the south of Tehran, was susceptible to liquefaction, Using dynamic analysis of potential risk zones on the verge of separation and liquefaction areas were also identified. These areas at depths less than 20 m below ground water surface and fine-grained sediments are non-cohesive.