evaluation and verification of static and quasi-static behavior of sheetpile wall using equivalent soil shear strength Anahita kamalnejad kamalnejadanahita@gmail.com , a.kamalnejad@cv.iut.ac.ir September 21.2020 Department of Civil Engineering Isfahan University of Technology, Isfahan 84156-83111, Iran Degree: M.Sc Language: Farsi Supervisors: Hamid Hashemolhosseini, Alireza Baghbanan,bagh110@cc.iut.ac.ir, bagh110@kth.se One of the main problems and concerns in the construction of civil structures is the protection of excavations and adjacent buildings when its not used properly, will lead to irreparable damage. One type of soil retaining method is steel sheet-pile walls. These structures are made in different sections and used as temporary or permanent structures. So far, various methods have been proposed to design and study the behavior of these earth retaining structures. Analytical design methods can be separated into "continuous methods" and "finite element methods " . Geotechnical calculations design of cantilever or restrained sheet-pile walls perform based on the lateral earth soil pressure, horizontal forces and moments equilibrium, to adjust the rupture state and buried depth, dredging line. In this study, using the mohr-coulomb failure criterion and finite difference software, the behavior of cantilever and restrained sheet-pile walls in frictional soils are investigated and the equivalent shear strength of cohesion sandy soils is considered with granular soil, the reliability coefficients of sheet-pile walls are calculated. Finally, it can be observed that the reliability coefficients of sheet-piles assuming the equivalent friction angle are often lower than the actual soil condition, so calculations based on equivalent soil shear strength are efficient but conservative. Keywords teel sheet-piles wall, granular cohession soils, Reliability, Shear strength of soil, Finite difference software