Study on Settlement Calculation Method for Subgrade of High Rockfill Embankment

As the settlement for subgrade of high rockfill embankment is influenced by the condition of construction and the settlement regularity for subgrade during and after construction is obviously different,which could not be described by one expression for the relation betweeh the settlement and the time.A modification of DuncanChang model is presented to calculate the subgrade settlement during construction,taking into account of compression deformation and shear deformation.As for the early settlement of subgrade,it is described by negative exponential function,in which both time and consolidation pressure are considered.The computation results of the early settlement for the subgrade during construction and postconstruction are in agreement with the data from the onthespot survey.