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为研究沥青路面温度场受外界环境的影响及其敏感程度,对重庆南岸区大气温度及太阳辐射能量进行实测。根据传热学理论,运用ABAQUS有限元软件进行建模并对其进行二次开发。结合沥青混凝土路面结构材料在不同温度时的蠕变非线性效应,改变大气气温、风速等参数,分析沥青路面结构温度场随相关参数的变化的规律。结果表明:沥青路面结构受大气温度的影响主要体现在路面面层,达到路面结构一定深度后,对路面结构的温度场的影响很小;大气温度是影响沥青路面全天温度场变化的主要因素;在中高温天气时,随着太阳辐射能量的增加,大气温度对路表温度的影响随之减小;随着路面结构深度的增加,不同深度位置处与大气对流作用频率下降,只有当上层结构与大气对流完成之后,才能由其以下的结构与大气对流,进而使下层结构温度差峰值向后延迟;风速对沥青路面温度场影响较大,应注意风速产生的温度场结果误差。
In order to study the temperature field of asphalt pavement affected by the external environment and its sensitivity, the atmospheric temperature and solar radiation energy of Chongqing Nan’an District were measured. According to the theory of heat transfer, the ABAQUS finite element software was used for modeling and secondary development. According to the creep nonlinear effect of asphalt concrete pavement structure material at different temperatures, the parameters of atmospheric temperature and wind speed are changed, and the law of the temperature field of asphalt pavement structure with relevant parameters is analyzed. The results show that asphalt pavement structure affected by atmospheric temperature is mainly reflected in the pavement surface. When reaching the depth of the pavement structure, it has little effect on the temperature field of the pavement structure. Atmospheric temperature is the main factor that affects the temperature field variation of asphalt pavement all day At mid-high temperature, with the increase of solar radiation energy, the influence of atmospheric temperature on the temperature of the road surface decreases. As the depth of pavement increases, the frequency of convection with atmospheric depth decreases at the same time. After the structure and atmospheric convection are completed, it can convect with the atmosphere by its following structure, and then delay the temperature difference of the underlying structure backwards. Wind speed has a great influence on the temperature field of asphalt pavement, so attention should be paid to the error of the result of temperature field caused by wind speed.