Document Type : Research Paper


1 Civil Engineering Department , University of Technology, Iraq,

2 Department of Civil Engineering, University of Technology-Iraq.


This paper comprises the study and analysis of Baghdad soil for eight geotechnical properties, which extract from field experiments of 630 boreholes with depth taken to 30m and representing 200 sites. Soil investigation reports are composed from altered laboratory tests. The soil layers. Divided into each 2m, which means 15 studied’ layers and soil properties values were embraced and submitted. in tables and charts which have been analysis-using excel2013 and check the charts using curve expert program to get the relationships between the properties values and the factor of safety against liquefaction. The correlations between liquefaction potential represented by the safety factor and soil properties for the available data of 200 sites in Baghdad have been studied and statistically studied ‘to evaluate both of soil properties and liquefaction potential index. Eight factors affecting liquefaction have been correlated with factor of safety for all earthquake magnitudes (ML= 4to 6.5 with 0.5 interval). These factors are, groundwater table, fill layer depth, standard penetration test (SPT- N value), saturated unit’ weight (γ), Relative density (Dr %), soil fractions (clay, silt and sand %), and total settlement (Stot). For better correlations, the same factors have been correlated with safety factor but for each earthquake magnitude alone.


[1] C. R. I. Clayton, M. C. Matthews, and N. E. Simons, “Site investigation,” Wiley-Blackwell, second edition, 1995
[2] H. H. Karim, and S.J. Wadaa, “Evaluation of liquefaction potential of Baghdad soil during earthquakes,” Global Journal of Engineering Science and Research Management, 4, 5, 86-99, 2017.
[3] H. H. Karim, and T. Schanz, “A study of sediments homogeneity of Baghdad area with evaluating liquefaction potential and settlement,” Iraqi Geol. J., 40, 1, 2006.
[4] H. H. Karim, M. Y. Fattah, and A.M. Hasan, “Evaluation of some geotechnical properties and liquefaction potential from seismic parameters,” Iraqi Journal of Civil Engineering, 6, 3, 30-45, 2010.
[5] H. H. Karim, and S. J. Wadaa, “Geotechnical study of Baghdad soil,” Global Journal of Engineering Science and Research Management, 4, 9, 92-106, 2017b.
[6] S. Toprak, and T.L. Holzer, “Liquefaction potential index field assessment,” J. of Geotechnical and Geoenvironmental Engineering, ASCE, 129, 4, 315-322, 2003.
[7] T. Iwasaki, F. Tatsuoka, K. Tokida, and S. Yasuda, “A practical method for assessing soil liquefaction potential based on case studies at various sites in Japan,” Proc. 2nd Int. Conf. on Microzonation, San Francisco, 885-896, 1978.
[8] T. Iwasaki, T. Arakawa, and K. Tokida, “Simplified procedures for assessing soil liquefaction during Earthquakes, Proc. of the conference on Soil Dynamics and Earthquake Engineering, Southampton, UK, 925-939, 1982.
[9] R. Luna, and I.D. Frost, “Spatial liquefaction analysis system,” J. Comput. Civ. Eng., 12, 11, 48-56. 1998.
[10] C.H. Juang, H. Yuan, D.K. Lee, S.F. Yang, and R.A. Christopher, “Estimating severity of liquefaction–induced damage near foundation,” Soil Dynamics and Earthquake Engineering, 2005