Dynamic response analysis of a geosynthetic-reinforced embankment overlying voids under traffic loads
To study the dynamic characteristics of a geosynthetic-reinforced embankment overlying voids,the geosynthetic-reinforced system was simplified as a double-layer foundation beam overlying voids,and the cor-responding analytical solutions were derived for the dynamic responses of the reinforced system under moving loads.The proposed solutions were verified by comparing with the calculation results of the existing theoretical model.The effects of model parameters on the dynamic response of the reinforced system were discussed,in-cluding the void length,the bending stiffness of the pavement slab and that of the reinforced cushion,and the elastic coefficient of the embankment fill and that of the foundation soil.Analyses show that the width of voids underlying the reinforced system,the bending stiffness of the pavement slab and the elastic coefficient of the foundation soil have significant impacts on the vibration response of the reinforced system under moving loads,and the impact on the vibration displacement of the midpoint of the reinforced cushion is more significant than that on the pavement slab.The bending stiffness of the reinforced cushion has a significant impact on its own midpoint vibration displacement,but has a relatively small impact on the midpoint vibration displacement of the pavement slab.On the contrary,the elastic coefficient of the embankment fill has a larger vibration dis-placement at the midpoint of the pavement slab,but a smaller vibration displacement at the midpoint of the re-inforced cushion.
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