Research on estimation modle of post construction settlement for soft ground

Estimation of the post construction settlemen is one of the most critical problems in expressway. Exponential curve method and hyperbola method is the most common method in the previous research; but the estimation results from the former model tend to be the smaller and those from the latter model tend to be larger. Based on analytical results, a kind of hyperbola model is proposed that the relationship between the settlement rate and the settlement seems as half-cube nonlinear behavior. Theoretical analysis and engineering case application prove that the estimation results of the new model are placed in those of two kinds models in common use; and they are close to the average. It is shown that the reliability of the estimation results is a little higher than the other two models.