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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 in Tibet is complex and diverse with high average elevation, large temperature difference between years and days, uneven distribution of rainfall and bad environmental factors that have seriously affected the service performance and life span of asphalt pavement in the area. In order to supplement and perfect the data of road performance zoning and asphalt mixture and asphalt mixture PG classification in this area, based on the meteorological data of 26 meteorological observation stations set in and around the Tibet area for 30 years, Principle, according to the topography, geomorphology, elevation, season and climate characteristics of its observatory 30 a data were calculated, divided and classified by establishing a mathematical model to find out the laws of the four major types of Tibet The natural climate zone and the 8 asphalt pavements use performance climates to facilitate the requirements and choices of asphalt pavement performance in different zones. At the same time, referring to the grading idea of asphalt pavement performance proposed by SHARP research plan, referring to the PG grading methods in some regions at home and abroad, the PG classification of asphalt in Tibet is formulated. The research results provide references for improving the quality of highway construction in areas with high altitude, alpine and large temperature difference, in selecting asphalt varieties, proportioning design of asphalt mixture and determining the construction technology of asphalt pavement.