南疆高温大温差地区高速公路沥青路面结构适应性

摘要

To analyze the adaptability of asphalt pavements to high temperature and large temperature difference in southern Xinjiang and control distresses due to high temperature, the STR-1 commonly used in Xinjiang, STR-2 and STR-3 used in other areas in China were selected.The temperature fields and the load-temperature coupled fields were simulated under the condition of 4th July, 2008.The results show that compared with air temperature, the structural temperature shows obvious time-lag with the increasing of depth.The thick asphalt surface course can effectively reduce the temperature influence on base course.The simulation results of load-temperature coupled fields shows that the STR-3 with compound base course has the best adaptability to high temperature and large temperature difference in southern Xinjiang.%为了分析南疆的高温大温差气候条件下沥青路面的结构适应性,以控制高温变形类病害的发生,选取了新疆常用沥青路面结构STR-1以及我国其他地区采用的沥青路面结构STR-2与STR-3,对这3种路面结构进行了高温代表日(2008年7月4日)下的温度场与荷载-高温耦合场的模拟计算.研究表明:同气温相比,随着深度增加,路面结构的温度变化呈现出明显的滞后性,较厚的沥青面层可有效减缓温度对基层的作用,减少温差带来的病害.荷载-高温耦合场的模拟结果表明:当以车辙累积量和高温最大剪应力作为衡量高温变形病害的评价指标时,采用复合式基层路面结构的STR-3对南疆高温大温差环境的适应性最佳.