Abstract
A large number of soft soil subgrade projects have been built in the tidal-flat zone of southeast China. Where, in addition to bearing the traffic loading, the soft soil subgrade may be swallowed up by tidal water. Therefore, the soft soil subgrade will bear long-term coupling action of tidal loading and traffic loading in the tidal-flat zone. Excessive settlement accidents of the subgrade occur frequently in the tidal-flat zone. In this study, a new dynamic constitutive relation considering seepage characteristics was used and the UMAT subroutine was embedded in ABAQUS. FE parametric analysis was analyzed considering three influencing factors of tidal amplitudes, traffic loading amplitude and tidal period. A multi-factor coupling settlement prediction expression considering tidal loading and traffic loading of soft soil subgrade suitable for soft soil subgrade in the tidal-flat zone was proposed. In addition, a settlement prediction program of soft clay subgrade under the combined tidal loading and traffic loading was designed and developed to facilitate engineering use. The research results can be applied to the subgrade projects in the tidal-flat zone, and provide a reference for engineering decision-making and disaster prevention and mitigation.
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