【作者】 宋宪发；

【导师】 凌建明；

【作者基本信息】 同济大学 ， 道路与铁道工程， 2008， 硕士

【摘要】 随着我国经济的发展,公路里程也在不断增加,其中占据主要地位的沥青公路在长期的使用过程中,出现了各种各样的病害,其中车辙为沥青路面的主要病害。在长期的研究中发现,最常见类型的流动性车辙发生的部位主要在沥青路面中面层,而目前维修这类车辙还没有更好的方法。本文通过导致流动性车辙的最大因素温度入手,针对排水性沥青路面大空隙的特性,监测排水性沥青路面和SMA沥青路面中面层温度,观察两种路面中面层温度的差异,找到另一种降低沥青路面车辙的方法。本文依托上海浦东五洲大道和滨洲路两条排水性沥青道路,通过在现场进行预埋传感器以及在不同季节对排水性沥青路面和SMA路面进行连续温度监测,得到两种路面中面层的温度数据,经过对数据不同角度的比较,总结出不论在哪个季节,和SMA路面相比排水性沥青路面对中面层有降温效果,而且气温越高降温幅度越大,降温幅度最大值可达到2.5℃。由于排水性沥青路面降温的主要原因是其排水层的大空隙特性,而路面经过长时间的使用,排水层的空隙率会不断降低,因此需建立空隙率——降温幅度之间的关系。本文利用不同空隙率的车辙板来模拟空隙经衰变后的排水性沥青路面,在室内进行小规模的模拟试验。通过夏季高温时段的连续监测,得到在相同环境条件下不同空隙率的降温幅度数据,发现随着排水层空隙率的不断降低,排水性沥青路面的降温效果也逐渐消失,当排水层空隙率衰减到8%左右时,排水性沥青路面对中面层的降温效果几乎丧失。为了能进一步了解连续空隙率的降温幅度,根据现场采集的温度数据与室内模拟试验得到的温度数据进行整理,运用多元线性回归的数学手段,将排水性沥青路面排水层空隙率与中面层降温幅度建立起关系式,为以后的研究打下基础。更多还原

【Abstract】 The miles of highway is increasing rapidly with the national economic development. Howerer, vavrious types of diseases inevitably occure in asphalt pavement during its service time, and rutting is the major type of all pavement diseases. Floating rutting, the most common kind of rutting, mainly occures in the mid-layer of asphalt course and is difficult to rehabilitate currently. Considering the most important factor that causes floating rutting, the author measured the temperature of both porous alphalt pavement (OGFC) and SMA pavement to find a new approach to reduce rutting in asphalt pavement.By comparing the consecutive temperature data mesarued on the test roads, including Wuzhou Road and Binzhou Road in Pudong district of Shanghai, it indicates that the mid-layer temperature of OGFC is always lower than that of SMA especially in the high temperature environment, and the largest difference reached 2.5℃during the tests.The void ratio determining the draining efficiency would decrease gradually as the OGFC pavement starts its service, therefore, it is necessary to establish the relationship between the void ratio of OGFC and the scale of temperature reduction. A large number of rutting board tests are impletmented to simulate the scale of temperature reduction due to different void ratios of OGFC. The results show that the scale of temperature reduction decreases with the void ratio drops, and the phenomenon of temperature reduction almost vanishes when the void ratio of OGFC drops to 8%.Finally, by analyzing the temperature data obtained from in-situ measurement and indoor simulation tests, the relation between the void ratio of OGFC and the scale of temperature reduction is estabished using multi-linearity regression method.更多还原