The dynamic finite element coupled model of track-embankment-foundation system was established for parametric effect on dynamic stresses of subgrade under high-speed train load. The influence of fastener stiffness and the elastic modulus of the CA mortar layer

supporting layer

surface layer of subgrade

bottom layer of subgrade

subgrade body

and foundation has been analyzed. Comparison between measured data of the full-scale model and the simulation results shows good agreement. The result of the analyses indicated that the elastic modulus of the supporting layer

bottom layer of subgrade and subgrade body has a bigger effect on the dynamic stress response on the subgrade. The elastic modulus of the bottom layer of subgrade has the biggest effect on the dynamic stress response on the subgrade. When the elastic modulus of bottom layer of subgrade increased from 60 MPa to 180 MPa

the surface layer of subgrade dynamic stress increased by 31.53%

the bottom layer of subgrade dynamic stress reduced by 14.43%

the subgrade body dynamic stress reduced by 16.10%.