西藏地区公路沥青路面路用性能气候分区及PG分级

Climate Zoning and PG Grading for Highway Asphalt Pavement Performance in Tibet Area

西藏地区地形地貌复杂多样,平均海拔高,年、日温差大,降雨量分布不均匀,恶劣的环境因素严重影响了该地区公路沥青路面的使用性能和寿命。为补充和完善这一地区公路沥青路面路用性能气候分区以及沥青和沥青混合料PG分级的资料,依托西藏地区及其周边设置的26个气象观测站30 a的气象统计资料,运用统计学的原理,按地形、地貌、海拔、季节以及气候特征对其观测站30 a的相关数据进行了计算、划分和归类,通过建立数学模型找出了其中的规律,列出了西藏地区4大典型自然气候区和8个沥青路面路用性能气候分区,方便了不同分区对沥青材料性能的要求和选择。同时,借鉴SHARP研究计划提出的沥青路面性能分级思想,参照国内外一些地区PG分级方法,制定了西藏地区沥青使用的PG分级。这一研究成果对于高海拔、高寒、大温差地区提升公路修建质量,在选择沥青品种、沥青混合料配比设计以及确定沥青路面施工工艺等方面提供参考。

The terrain and topography in Tibet area are complex and diverse,the average altitude is high,the annual and daily temperature differences are large, the rainfall distribution is uneven, and the harsh environmental factors seriously affect the performance and life of the asphalt pavement in the area. In order to supplement and improve the climate zoning of road asphalt pavement performance and the PG classification of asphalt and asphalt mixture in this area,relying on the statistical data of 26 meteorological stations in Tibet and its surroundings in 30 years,applying the principle of statistics,according to terrain,topography,altitude,season and climate characteristics,the relevant data of the meteorological stations in 30 years are calculated,divided and classified. Through the establishment of the mathematical models,the laws are find out,the 4 typical natural climate zones and the 8 asphalt pavement performance climate zones in Tibet are listed,which facilitated the requirements and selection of the asphalt material performance in different zones.At the same time,referring to the idea of grading asphalt pavement performance proposed by SHARP research plan and the PG grading method in some areas at home and abroad,the PG grading of asphalt used in Tibetarea is developed. This research result can improve the quality of highway construction in high altitude,highcold and large temperature difference areas,and provide a reference for selecting asphalt varieties,asphalt mixture design and determining asphalt pavement construction technology.