Anzali as one of the populated coastal cities in the Northern Iran, contains a particular type of marine sand which is worth to be investigated for many engineering practices. This particular sand is mainly composed of saturated fine grains and is highly prone to liquefaction phenomenon during seismic events. Geotechnical zonation of the subterraneous layers show that most of sandy sedimentary soils found below the surface in this area is formed by relatively clean and fine sand. In this research, the geotechnical characteristics of Anzali sand have been studied. It is done based on three sources of information, i.e. field studies, static tests and physical modeling by dynamic tests. In this regard, the overall zonation of this area has been carried out and the extent of the sandy area has been investigated. Anzali sand has been characterized by making use of a number of soil samples obtained from various parts on which, index tests have been carried out. Furthermore, based on laboratory shear tests and information gathered from in situ tests, the shear strength parameters and the critical limits for Anzali sand have been classified. Finally, large scale physical model tests were conducted to show the dynamic behavior of the sand under cyclic and dynamic loads and also the development of the excess pore water pressure during dynamic loading that could cause the liquefaction initiation.
In essence, the paper’s primary contribution is to find or estimate Anzali Sand parameters which are required for prediction or analysis of liquefaction potential during seismic effects. This is done by a number of tests on samples extracted from locations in this area.
Ahmadi, H., A. Eslami and M. Arabani, 2014. Effect of soil improvement by grouting on settlement of Anzali sand under siesmic loading. 1st National Conference of Soil Mechanics and Foundation Engineering, Tehran, Iran.
Asefi, A., A. Eslami and M.A.L. Neshaei, 2009. Investigation of Anzali harbor sand behavior using a glass tank and a vibration table. Sharif: Civil Engineering, 25(48.1): 15-22.
Azizi, S. and A. Ghadimi, 2010. Study of dynamic behaviour of Anzali beaches sand in the critical state soil mechanics framework. 4th Iranian Geotechnical Engineering and Soil Mechanics Conferences, Tehran, Iran.
Bolton, M.D., 1986. The strength and dilatancy of sands. Géotechnique, 36(1): 65-78.
Brunet, M.F., M.V. Korotaev, A.V. Ershov and A.M. Nikishin, 2003. South Caspian basin: A review of its evolution from subsidence modelling. Sediment. Geol, 156(1-4): 119-148.
Budhu, M., 2011. Soil mechanics and foundations. 3rd Edn., Hoboken, NJ: John Wiley & Sons.
Fattahzadeh, S., 2005. Behavior and determining the properties of Anzali sand using triaxial tests. M.Sc Thesis, University of Guilan.
Ghorbani, A., M. Veiskarami, N. Hamidzadeh and A. Nemati Mersa, 2013. A study on the bearing capacity alteration of shallow foundation resting on Anzali sand after applied cyclic loading. 7th Int’l. Sym. on Adv. in Sci. and Tech. (7th SASTech 2013), 7-8 March, Bandar-Abbas, Iran.
Hasani, M., 2009. The effect of dynamic forces on the pore water pressure and displacement changes of Anzali sand using a transparent tank. M.Sc Thesis, University of Guilan.
Ishihara, K., 1993. Liquefaction and flow failure during earthquakes. Geotechnique, 43(3): 351–415.
Jackson, J., K. Priestley, M. Allen and M. Berberian, 2002. Active tectonic of the South Caspian basin. Geophys. J. Int, 148(2): 214-245.
Olson, S.M. and T.D. Stark, 2003. Use of laboratory data to confirm yield and liquefied strength ratio concepts. Canadian Geotechnical Journal, 40(6): 1164–1184.
Ranjbar, M., 2012. Anzali wetland and morphological characteristics of the impact of changes in land use. Quarterly Geographical Journal of Territory, 9(34): 93-111.
Talebi, K., 1998. Diazinon residues in the basins of Anzali Lagoon. Iran. Bull. Environ. Contam. Toxicol, 61(4): 477-483.
Xiao, J., J. Fan, L. Zhou, D. Zhai, R. Wen and X. Qin, 2013. A model for linking grain-size component to lake level status of a modern clastic lake. Journal of Asian Earth Sciences, 69(5): 149-158.