沙漠长寿命沥青路面设计研究

Research on the Design of Long-life Asphalt Pavement in Desert

为延长沥青路面使用寿命,以乌玛高速公路中卫段为例,对宁夏沙漠地区气候、环境特征及路面状况进行了调查。根据宁夏沙漠地区试验沥青路面结构进行了演算分析,找到了最适合宁夏沙漠地区使用的沥青路面结构。研究结果表明:一是宁夏北部地区和中部地区的沥青路面的主要病害类型为裂缝,部分路面有凹陷和局部网裂;宁夏南部山区的沥青路面的主要病害类型为裂缝和水损害;二是对拟定的路面结构的力学响应进行了验算分析,初步验证了试验沥青路面结构的合理性;三是通过对现场试验段的路面指标检测,综合检测结果、计算模拟分析和室内试验结果,推荐结构C和结构D作为宁夏沙漠地区沥青路面的优先选择结构。

In order to extend the service life of asphalt pavement,taking the Zhongwei section of the Wuhai-Maqin Expressway as an example,a survey is conducted on the climate,environmental characteristics,and pavement conditions in the desert area of Ningxia.Based on the experimental asphalt pavement structure in the desert area of Ningxia,a calculation and analysis are conducted to find the most suitable asphalt pavement structure for use in the desert area of Ningxia.The research results indicate that:firstly,the main types of asphalt pavement diseases in the northern region and central region of Ningxia are cracks,with some pavements having depressions and local network cracks;the main types of asphalt pavement diseases in the southern mountainous areas of Ningxia are cracks and water damage;secondly,the mechanical response of the proposed pavement structures are verified and analyzed,preliminarily confirming the rationality of the experimental asphalt pavement structure;thirdly,by conducting pavement index testing on the on-site test section,and integrating the testing results,calculation simulation analysis,and indoor test results,it is recommended that Structure C and Structure D be the preferred structures for asphalt pavement in the desert area of Ningxia.