Research Of Prediction Method For Subgrade Foundation Post-construction Settlement On High-speed Railway

The high-speed driving of train needs a highly smooth railway tracks and the stable foundation, therefore,the control the deformation is the key point of designing and construction of high-speed railway subgrade. The analysis of laying ballastless track of high-speed railway post-construction settlement is a new high-speed railway construction technical, this experience of domestic is not mature, it is necessary to analysis the high-speed railway post-construction settlement. This thesis analysis the traditional post-construction settlement forecast method and the gray theory,meanwhile jointly cubic spline interpolation grey system combined modeling applied to forecast of post-construction settlementIn the traditional post-construction settlement forecast method,Mainly analyses the hyperbolic method,expand hyperbolic method,three-point method,Asaoka method,Hushino method,Poisson curve method, Summarizes the applicability and stability of these methods.In the study of the grey theory forecast post-construction settlement, mainly compared with the traditional methods, the comparison results show that the accuracy of grey theory obviously higher than conventional forecast method Meanwhile in gray system GM (1,1) model research process, through the linear interpolation and cubic spline interpolation in gray system respectively joint modeling, draw cubic spline interpolation precision higher than the linear interpolation precision.This paper comprehensively expounded the high-speed railway subgrade engineering related technical requirements, discusses the forecasting methods of post-construction settlement, so as to provide reference for the design and construction of the high-speed railway.