416 Copyright © 2018, IGI Global. Copying or distributing in print or electronic forms without written permission of IGI Global is prohibited. Chapter 12 DOI: 10.4018/978-1-5225-2709-1.ch012 ABSTRACT Liquefaction may be triggered by cyclic loading on saturated silty sands, which is responsible of severe geotechnical problems. Development of excess pore water pressure in soil results in a liquid-like behavior and may be the reason of unavoidable superstructural damage. In this study, in order to investigate the behavior of saturated silty sands exposed to cyclic loading under undrained conditions, a systematic testing program of stress-controlled cyclic triaxial tests was performed on specimens of diferent silt contents, under diferent loading conditions and environment. The efect of parameters such as silt con- tent on the liquefaction behavior of specimens was studied. Pore water pressure and shear strain curves were obtained for the silty sands. Furthermore, the boundaries existing in the literature on sands are compared with the results current research, on silty sands. Conclusively, the outcomes of this study were useful to develop insight into the behavior of clean and silty sands under seismic loading conditions. 1. INTRODUCTION While the cyclic behavior of clean sands has been investigated in-depth over the fifty years, this phe- nomenon in silty sand containing varying amounts of fines, stimulated a real interest in recent twenty years. The number of researches on this subject are quite limited and the studies claim that this type of soil is more susceptible to liquefaction, in comparison with clean sand. However, the reported results are still contradictory due to effect of fines content on the shear strength of silty sands. The effect of fines content on the cyclic liquefaction potential of sands has been investigated extensively in geotechnical literature. Several investigations in the field shows that the presence of fines increases liquefaction resistance (Seed and Lee 1966; Seed et al., 1985) while laboratory tests results show dif- ferent trends, for the fine content less than 30% (Koester et al., 1994; Troncoso, 1990). Koester (1990) Determination of the Cyclic Properties of Silty Sands Eyyüb Karakan Kilis 7 Aralik University, Turkey Selim Altun Ege University, Turkey