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  1. A number of studies examining the effect of shear strain rate on undrained shearing resistance of clean sands using conventional laboratory tests have been reported. Constant-volume direct simple shear laboratory tests were performed to model flow displacements at various shearing rates after triggering flow liquefaction. Tests on clean sand (Ottawa F-65 sand) at shear strain rates of 0.1%/min and 10%/min illustrated that the undrained yield (peak) shear strength at a shear strain rate of 10%/min was about 14% greater than that measured at a shear strain rate of 0.1%/min, while the undrained critical-state shear strength is relatively independent of shear strain rate for the shear strain rates (0.1%/min and 10 %/min), sand type, and initial state considered in this study. 
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