Finite element analysis of stress caused by load on leanconcrete-asphalt overlays composite pavement

In order to study the stress state of lean concrete-asphalt overlays composite pavement under different road structure and material parameter,a 3D finite element method was used to analyze the effects of the thickness of asphalt overlays, the modulus of asphalt overlays,the thickness of stress absorbing layers,the modulus of stress absorbing layers and the width of lean concrete crack to the bottom stress of asphalt overlays.Calculation and analysis of the pavement construction indicate that: it is effective to avoid reflective cracking in lean concrete-asphalt overlays composite pavement by increasing thickness other than intensity of asphalt overlays;it is also effective to lower the stress lever of the bottom surface of asphalt overlays by set the stress absorbing layers which has stated thickness and modulus;the cracking width of lean concrete base has great effect on the bottom stress of asphalt overlays.6 tabs,6 figs,7 refs.