基于有限元的长大纵坡沥青路面力学分析

Mechanical Analysis of Long Longitudinal Slope Asphalt Pavement Based on Finite Element

为研究在车辆载荷作用下长大纵坡沥青路面的动力响应规律,通过对交通量的调查分析,选择代表车辆进行后续研究。以车辆的平衡速度、轮路接触应力及沥青路面温度场为基础,通过Abaqus有限元模拟软件建立了沥青路面结构模型,选择坡度、温度场、装载率进行单因素分析。试验结果表明,坡度对沥青路面的动力响应影响较小,但温度和装载率对其影响较大:高温状况下基层层底拉应力较低温状况下增大约80%;200%装载率则较100%装载率增大基层层底拉应力约400%。对于文中所研究的路面结构,剪应变和剪应力峰值区域出现在路表下方6 cm附近,因此在路面设计施工时,可针对性提高中面层上部及中上面层连接处的抗剪切能力,以提高长大纵坡段的路用性能。

In order to study the dynamic response of long-longitudinal-slope asphalt pavement under the action of vehicle load, representative vehicles were selected for following-up research after the investigation and analysis of traffic volume. Based on the vehicle’s equilibrium speed, wheel-road contact stress and asphalt pavement temperature field, the asphalt pavement structure model was established by Abaqus finite element simulation software. And the slope, temperature field and loading rate were selected for single factor analysis. The test results showed that the slope has little effect on the dynamic response of the asphalt pavement with long and large longitudinal slopes.while temperature and load have a greater impact on it: the tensile stress at the bottom of the base layer increases by about 80% under the high temperature condition, and 400% under the 200% loading rate condition. For the pavement structure studied in the article, the peak area of shear strain and shear stress appears near 6 cm below the road surface. Therefore, during the design and construction of the road surface, the upper and middle surface layers can be targeted to improvethe shear resistance of the connection between the middle and upper layers to improve the road performance of the long longitudinal slope section.