沥青路面沥青层剪应力变化简化模型研究

根据层状弹性理论利用有限元软件ANSYS建立了计算多层沥青路面的有限元模型,并利用其计算多层沥青路面结构的沥青层剪应力沿深度方向的分布规律,通过计算大量结构分析总结出沥青层剪应力随着面层厚度、基层模量和基层厚度改变的变化规律;在这些规律的基础上通过修改伽马分布的密度函数的公式试算得出了沥青面层沿深度方向剪应力规律曲线的数学方程.结合此方程和本课题组研究的车辙预估方程编纂了计算剪应力分布和路面车辙预估的应用软件.

Research on Simplified Model for Variation of Shear Stress of Asphalt Layers in Asphalt Pavements

The model of the multi-layer asphalt pavements is built with the finite element software ANSYS according to the elastic layer system theory.Based on the model,the shear stress distribution along the depth of the asphalt layer in asphalt pavements is calculated.The shear stress distribution changing rules of the asphalt layer as thickness of surface,modulus of base or thickness of base change are found by calculating lots of structural compositions.Based on these rules a shear stress curve functional equation along the depth of the asphalt layer is obtained by modifying the probability density function of the Gamma Distribution.Software used calculating shear stress and pavement rut is programmed according to the function above and the function of pavement rut evaluation.