Long-term traffic is bound to bring a greater accumulated plastic deformation with the growing masses

the improving speed and the increasing train density.Therefore

it is urgently needed to further research roadbed vibration.This paper mainly studies subsoil settlement of eolian in west Liaoning and takes its undisturbed sample to study

basic physic and mechanics parameters of eolian through indoor conventional geotechnical experiment.Based on the dynamic strength test results compare those with direct shear test results and consider train cycle load as well as dynamic strength and static load by using the dynamic strength relationship.Finally

according to the test results

the high-speed trains regressive analysis for settlement amount is made

and the prediction methods of settlement are obtained.Subsoil subgrade numerical simulation under the train vibration load based on Midas software is made

we get the relationship between settlement amount and some parameters through parameters adjustment in the simulation process.Finally the roadbed vibration design and roadbed isolation measures are proposed

and the unified design method is obtained.