为了分析环境温度变化时混合式基层沥青路面结构的疲劳损伤特性，拟定3种混合式基层沥青路面结构，充分考虑广西河池地区各月温度变化以及土基回弹模量的季节性变化，运用ABAQUS软件对2种层间结合状态的4种路面结构方案的温度场、应变响应和疲劳损伤进行计算分析，通过试验路面温度传感器、应变片的监测结果和疲劳损伤模拟模型计算沥青层的疲劳损伤。研究结果表明：在不同月份温度下，沥青路面应变响应差异大，随着气温升高，层底弯拉应变增大；各季节疲劳损伤存在明显差异，高温季节产生的疲劳损伤所占比例较大；以水稳碎石为底基层，级配碎石为基层及大粒径沥青碎石混合料作下面层的混合式基层沥青路面结构方案B，温度敏感性最小，疲劳损伤最小。研究结果可为选择良好的混合式基层路面结构提供思路。%In order to analyze the fatigue characteristics of composite base asphalt pavement structure under the change of ambient temperature, the impact of Hechi temperatures of each month in Guangxi and seasonal variations of subgrade resilient modulus were considered, and three kinds of asphalt pavement structures on composite base were put forward. With ABAQUS software, two states between layers were considered, and the temperature field, strain response and the cumulative fatigue damage of four pavement structures were calculated and analyzed. By monitoring results oftemperature sensors and strain gauges with straight road tests, simulation models were used to calculate fatigue damage of asphalt layer. The results indicate that the strain response with different temperature fields in each month in asphalt pavement is varied. When the temperature increases, the tensile strain at the bottom of asphalt layer increases. The fatigue damage in different seasons is varied and has high proportion in high temperature season. Based on the ambient temperature change considerations, the temperature sensitivity of scheme B is the smallest (scheme B means composite base asphalt pavement which is made of cement stabilized, graded gravel for the base layer and large size asphalt macadam mixture layer), and its fatigue damage is the minimum. The research results can provide reference for choosing good pavement structure on composite base.
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