Abstract
Proper understanding of the ball penetration behavior under centrifuge condition is important for accurate soil property determination. In this study, large deformation finite element (LDFE) analyses are conducted to investigate the scale effect of ball penetrometer on its behavior in clay-over-sand deposit in centrifuge tests. The finite element model of this study is validated against previous theoretical solutions and available centrifuge test data with good agreement. Parametric studies are then carried out to explore the effects of potential factors, including the layer thickness ratio, the shaft-ball area ratio, the undrained shear strength of clay, and the relative density of sand. The results indicate that the soil failure mechanisms can be divided into three stages: i) shallow embedment stage, ii) cavity evolution stage, and iii) full-flow stage. The penetration resistance profiles in centrifuge tests can be better quantified, which can provide more accurate shear strength interpretation for the top clay.
Published Version
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