A Study on Mechanical Properties of Filling Composite Pavement under Different Surface Combination Types

Considering stress and deformation of pavement in design of composite pavement structure,combined with an elastic layered theory system,the ABAQUS software is used to establish a mechanical simulation model of composite pavement with different surface combination types.The simulation including circumstances of surface and middle layers both using modified asphalt concrete or cement mortar pouring concrete;surface layer using modified asphalt pavement-middle layer using cement mortar pouring concrete;surface layer using cement mortar pouring concrete + middle layer using modified asphalt pavement.The mechanical properties,i.e.bottom stress,strain,and deflection of road surface,of different combination types of pavement are computed.Results show that compared with the common pavement structure,when surface and middle layers both using cement mortar pouring concrete,tensile stress of bottom layer and deflection of road surface are reduced by 25.7% and 50.9 %,respectively.When cement mortar is poured into middle layer,the relevant properties are also better than common pavement structure.When cement mortar is pouring into surface layer,the maximum tensile stress has greater influences than which of common pavement structure.It suggests that composite pavement has best mechanical properties when cement mortar is used for both surface and middle layer.When cement mortar is used for middle layer is less good,while it is only used for surface layer is not recommended.