Abstract:For high-speed railway,deformations of embankment are divided into three categories:(1) residual deformations due to loading of train during transport operation;(2) elastic deformations due to loading of train during transport operation;and (3) consolidation of embankment and foundation. As to red layer,which belongs to weak rock,its engineering properties are unfavorable bad because that it is easy to collapse,and its strength is very low. Based on results of long-term static test of simple compression without confining pressure,in which the grain size of sample is less than 2 mm and compacting degree is about 95%,permanent settlement can be predicted by numerical algorithm. At the same time,subgrade is reinforced by vibration test of embankment in laboratory;and deformations of dynamic load are estimated. It is proved that red layer can be served as filling with a certain construction methods;and deformations in permanent operation are under control.