摘要
南疆城市阿拉尔市区的沥青混凝土道路每年冬-春就会出现不同程度的变形破坏现象,通过对虹桥路试验路段不同深度路基结构层及一侧绿化带内相应深度取土样,运用SEM微观电镜观测土样微观结构发现:路基水泥土稳定层膨胀疏松,掺杂着大量具有膨胀作用的硫酸钠晶体和硫酸钙晶体,而其他结构层很少,绿化带土样则几乎观测不到,表明水泥土稳定层发生膨胀是导致沥青混凝土道路变形破坏的主要因素.对路基内盐分及温度、路面竖向变形、地下水位变化分析得知,路基内盐-温-水共同作用是促使水稳层产生膨胀变形的因素,因此对于该地区道路工程应做好控温限盐防水的措施.
There are different degrees of deformation on the urban road asphalt concrete every winter and spring in Alar, a city in southern Xinjiang. Soil samples are taken from different depth of subgrade structure layers and one side of the green belt in Hongqiao Road test section. Its micro structure with SEM scanning display that subgrade soil cement stabi- lized layer is expanded and loose, mixed with a large number of expanded elements such as sodium sulfate and calcium sulfate crystal, which are few in other layers, and almost none in green belt. The results show that the expansion of soil ce- ment stabilized layer is the main factor of asphalt concrete pavement deformation. Analysis of the salt, temperature, verti- cal deformation in subgrade pavement and changes of underground water level prove that the interaction of salt-tempera- ture-water in subgrade promotes the expansion of the water layer, so it is better to control the temperature and salt, and take water proofing measures for road engineering in this area.
出处
《宜宾学院学报》
2016年第6期1-4,共4页
Journal of Yibin University
基金
国家自然科学基金项目(51168042)
关键词
路基
水泥土稳定基层
竖向变形
subgrade
soil cement stabilized base
vertical deformation
