Owing to the lack of complementary shear stress on vertical boundaries of a direct simple shear (DSS) specimen, the stress/strain distributions in soil specimens are not uniform. Although the previous studies discussed the effect of diameter-to-height ratio (D/H) on the mechanical and dynamic properties of soil, there is a lack of experimental studies that cover the influence of D/H ratio on the liquefaction potential of sand under stress and strain-controlled conditions. In this study, the influence of the D/H ratio on the cyclic behaviour and liquefaction potential of Ottawa sand C-109 and Ottawa sand F-65 specimens is experimentally investigated. Reconstituted soil specimens of Ottawa sands were prepared at four different D/H ratios using the combined triaxial simple shear (T_xSS) and conventional DSS devices. The influence of the D/H ratio on the cyclic behaviour in terms of pore pressure generation and decay …

The results of cyclic strain-controlled tests performed on reconstituted specimens of Ottawa sand F-65 using the combined triaxial simple shear (T_xSS) apparatus were used to establish a strain/energy-based pore pressure model. The model was utilized in conjunction with the sigmoid function (SIG4) to simulate the cyclic behavior of Ottawa F-65 sand under stress and strain loading conditions using FLAC at the element-level and in 1-D effective stress analysis. A counterpart set of cyclic stress-controlled direct simple shear (DSS) tests was performed to assess the predictive capability of the numerical model to determine the liquefaction potential curves. Two dynamic centrifuge tests were simulated using the proposed model and Finn model, and a satisfactory comparison of the observed and computed responses in terms of pore water pressure generation at different depths was obtained. Furthermore, model …