连续变温下沥青路面车辙分析与高温预警

Analysis of Asphalt Pavement Rutting in Continuously Changing Temperature Field and Early Warning for High Temperature

摘要:

以南京地区气候特征为例,采用连续变温车辙分析方法模拟不同温度场、不同接地压力下沥青路面车辙的变化规律,分析影响车辙的显著因素,并据此建立考虑气候的日车辙预估模型.结果表明,利用连续变温的路面车辙模拟分析方法可更符合实际地进行车辙模拟分析；车辙主要产生于平均气温高于20℃的高温季节的高温时段,且车辙日发展规律呈“S”曲线.因此以5月份平均气象条件下车辙量为基准,提出以车辙指数IRD为依据的高温预警等级与防护措施.

Abstract:

Through the statistical meteorological conditions of Nanjing area, the temperature filed of asphalt pavement was analyzed. Based on temperature field analysis and laboratory material tests, the reasonable simulation model considering consecutively variable temperature was developed to study the effect of exterior factors (temperature and load) on rutting. The remarkable influence factors were analyzed, and then the rutting prediction model considering the climate factors was established. It is indicated that the rutting analysis close to the field condition can be simulated using the simulation method considering continuously changing temperature field; rutting usually occurs at the average daily air temperature of 20 ℃ or hgher, and the variety of daily rutting is a typical S curve. The index of rutting depth is defined and early warning method for high temperature and corresponding protective measures are also put forward.