Feedback Analysis Method and Its Application on Consolidation Settlement of Subgrade

Subgrade consolidation settlement was the basic content of deformation monitoring and settlement assessment for the railway, controlling settlement deformation was one of the key factors for the project. Based on measured settlement from subgrade, major mechanical parameters about subgrade soil were obtained by finite element method and BP neural network. After obtaining these parameters, finite element calculation would be done for consolidation settlement about subgrade, the deformation from pavement in different periods and post construction settlement and the average degree of consolidation for every stratum would be predicted based on the results, feedback analysis on consolidation settlement for the subgrade would be obtained. The results from it’s application in a railway subgrade project show that: this method may not only obtain rapidly the major mechanical parameters of soil layer, but also predict the consolidation settlement from subgrade reasonably. It can provide a good reference for the design and the operation and the settlement assessment in the railway project.