横观各向同性的半刚性基层沥青路面结构

为了分析土基和沥青面层材料的横观各向同性特性对半刚性基层沥青路面结构的影响,基于建立的横观各向同性沥青路面设计理论,运用编制的基于该理论解的路面结构分析程序ANISOLAYER,利用沥青面层及土基横观各向同性特性,对半刚性基层沥青路表(路表面)弯沉进行了研究。同时运用ANISOLAYER程序分析了在不同厚度沥青面层及不同半刚性基层弹性模量情况下,土基横观各向同性特性对路面结构关键性设计指标的影响(路表弯沉、半刚性基层底部拉应力及路基顶部压应变,沥青层底应变为压应变或较小的拉应变,故未考虑)。研究结果表明:无论是面层还是土基,其各向异性度(水平弹性模量与垂直弹性模量之比)对路表弯沉的影响曲线变化趋势是一致的;随着土基水平模量的增加,延长了路面的寿命;随着半刚性基层弹性模量的增大,土基水平模量的变化对路表弯沉及基层底部拉应力的敏感性将降低,对路基顶部压应变的敏感性更加显著,但其绝对值较小。

Asphalt pavement structure with semi-rigid base course based on cross-anisotropy

In order to analyze the effect of material cross-anisotropy of subgrade and AC on the asphalt pavement structure design for semi-rigid base course,based on the established cross-anisotropic asphalt pavement design theory,using the compiled analytical pavement structure program ANISOLAYER,through studying the asphalt pavement surface deflection for semi-rigid base course by the cross-anisotropy of AC and subgrade,whether AC or subgrade,the anisotropic parameters(ratio of horizontal elastic modulus to vertical elastic modulus) have the similar influencing trend on the pavement surface deflection,and the effect of subgrade cross-anisotropy to the critical pavement responses(pavement surface deflection,tensile stress at the bottom of semi-rigid base course and compressive strain at the top of subgrade,the tensile strain at the bottom of AC is not considered because it is a small tensile strain or compressive strain).The analysis shows that: with the increase of subgrade horizontal elastic modulus,almost all increase the life of pavement,with the increase of elastic modulus of semi-rigid base course,the sensitivity will decrease for subgrade horizontal elastic modulus to the tensile stress at the bottom of semi-rigid base course,and more obvious for the compressive strain at the top of subgrade,but the absolute values are very small.4 figs,7 refs.