考虑碎石横观各向同性的路表弯沉及结构分析

Analysis of surface deflection and structure of asphalt pavement for granular base based on cross-anisotropy

使用基于横观各向同性层状弹性体系解编制的路面结构分析程序ANISOLAYER,对沥青路表弯沉进行了分析.结果表明,当碎石基层厚度达到一定程度后,其横观各向同性特性对路表弯沉的影响将不明显.不同沥青面层厚度情况下,碎石基层水平模量对路面关键性设计指标的影响分析结果表明,将碎石材料看作横观各向同性体可有效降低基层底部的拉应力,基层水平模量的变化对路面关键性设计指标影响较大;较厚的沥青面层以及适中的基层厚度,可使路表弯沉和面层底部拉应变降低;而对于薄及中厚沥青面层,基层横观各向同性特性对路基顶部的压应变影响较大.

Based on the established cross-anisotropic layered elastic theory, and by using the pavement structure analytical program ANISOLAYER compiled by this theory, the surface deflection of asphalt pavement was analyzed. The results show that the effect of cross-anisotropy to surface deflection is not obvious when the thickness of granular base is at some degree. The effect of granular horizontal elastic modulus to the critical pavement responses was also analyzed. The results show that, the tensile stress at bottom of base will decrease considering the granular material as the cross-anisotropy, the change of horizontal elastic modulus of granular base has more effect on the critical pavement responses, the pavement surface deflection and tensile strain at bottom of AC will decrease with the thicker AC and suitable thickness of granular base, and the effect of cross-anisotropy of granular base to the compressive strain at top of subgrade is greater for the thin and medium thickness of AC.