New method for forecasting subgrade settlement of railway passenger dedicated line

The control of post-construction settlement of subgrade is one of the key problems of railway passenger dedicated line construction; therefore, it is beneficial to design and construction that using the field observation data of railway passenger dedicated line subgrade to find the corresponding settlement laws. The thought of three-point method is introduced into hyperbola model based on analyzing mass data of some high-speed railway subgrade; a three-point method based on hyperbola model for subgrade settlement prediction has been proposed. The concrete method is that three suitable points of the measured settlement curve taken as forecast sample are substituted in hyperbola model to forecast the settlement. The common forecast methods such as hyperbola method, three-point method, Asaoka method, Hushino method and Poisson curve method are used as comparison to check the new method. The research results show that the model of hyperbola based on three-point method agrees better with the measured data, with small errors and high correlated coefficient, so as to provide references for the settlement prediction of laying ballastless track of railway passenger dedicated line.