长寿命沥青路面设计指标研究

为了研究长寿命路面设计方法, 采用SHELL、AI等设计方法对国外提出的沥青层底拉应变与土基顶面压应变标准进行了验证, 根据国外典型长寿命路面结构组合进行应变指标计算与统计分析, 并基于中国路面设计参数对长寿命路面设计指标进行修正。经过统计分析, 验证了国外提出的2个长寿命路面设计指标的可行性, 并提出了适用于中国长寿命路面结构设计的控制指标: 沥青层底拉应变不大于120×10^-6, 土基顶面压应变不大于280×10^-6, 并对已有试验路结构进行了力学分析。分析结果表明: 试验路的沥青层底拉应变均小于120×10^-6, 土基顶面压应变均小于280×10^-6, 这表明试验路段满足长寿命路面指标。

Research on design indices of perpetual asphalt pavement

In order to investigate the design method of perpetual asphalt pavement, the indices about tensile strain at the bottom of asphalt layer and the compressive strain at the top of subgrade were validated with SHELL design method, AI design method and so on, the strain indices were statistically analyzed according to the structure combination of representative perpetual asphalt pavement in foreign countries, and the design indices were modified based on the pavement design parameters in China, the two foreign design indices of perpetual pavement were approved to be reasonable, the control indices of structure design for perpetual pavement in China were put forward as follows: the tensile strain at the bottom of asphalt layer should be not more than 120×10-6, and the compressive strain at the top of subgrade should be not more than 280×10-6, the mechanical analyses of test road structures were carried out. Study result shows that the tensile strains at the bottom of asphalt layers are less than 120×10-6, and the compressive strains at the top of subgrades are less than 280×10-6, so the test road sections satisfy the indices of perpetual pavement.