Analysis of Dynamic Response and Stiffness Sensitivity of Red-bed Soft Ground Embankment under Vibration Load
In order to expand the selection range of subgrade filling in red bed region,taking spoil residue from excavation and tunneling of red-bed soft rock as the filling of the high-speed railway subgrade in the Southwest,a ballast track-subgrade system model for the embankment was established,and the dynamic response of subgrade structure under the action of train vibration load was studied.Combined with the orthogonal test and GRA analysis,the parameter sensitivity ranking of subgrade dynamic stress is determined.The result shows that,the dynamic stress and dynamic displacement distribute unevenly in saddle shape on the transverse direction of subgrade,and the distribution of dynamic stress is more uneven;the increased elastic modulus of track bed material can effectively reduce the dynamic stress on the surface of foundation bed,but there is almost no effect on the dynamic displacement;when the elastic modulus of the subgrade body and the foundation material is increased,although the dynamic stress increases slightly,the dynamic displacement can be inhibited to increase and the plastic deformation may be decreased;at the same time,each lower structural layer shall be matched a proper stiffness,and the subgrade body and the foundation shall not have too large stiffness,the elastic modulus of the material is appropriate not to exceed 90 MPa and 80 MPa respectively.
万方数据
维普
