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Primary research on dynamic backcalculation(based on FWD)of the moduli of road surface

YUAN Xigui1,LIANG Xinzheng2,YUAN Bo3(1.The Department of Civil Engineering of Southwest University of Science and Technology,Mianyang621000,China;2.Jiangsu Province Transportation Reseach Institute,Nanjing210000,China;3.The Department of Civil Engineering of Huaqiao University,Quanzhou362000,China)  
This essay adopts limited units of axial symmetry and theory of system recognizing backcalculation,in which the dynamic effect of the road surface reaction to load of FWD is considered.Through the analysis of the two examples,dynamic backcalculation is more practical when compared with backcalculation of simulated static,whereas backcalculation of simulated static is practical only when the depth of bedrock is very deep.
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