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针对拉萨至贡嘎机场公路所处的高原特殊气候条件造成的沥青路面低温开裂问题,本文采用有限元方法,对比分析了不同沥青路面结构温度应力;从减小沥青路面温度应力出发,推荐了适宜于拉萨至贡嘎机场公路的沥青路面结构。分析得出:沥青路面温度应力沿结构层厚度方向变化幅度逐渐减小,且其最大值和最小值出现的时刻相对滞后,基层温度应力已经很小;当下面层采用ATB-25结构或在水泥稳定碎石基层顶面增设级配碎石层,可以有效减小沥青路面温度应力,其中增设级配碎石层的路面结构温度应力改善效果最为明显。在综合考虑沥青路面温度应力与西藏地区施工技术条件后,推荐在拉萨至贡嘎机场公路路面结构中设置10cm级配碎石层,从而减轻沥青路面低温缩裂问题。
In order to solve the problem of low temperature cracking of asphalt pavement caused by the special weather conditions in Lhasa-Gonggar airport and highway, finite element method is used in this paper to analyze the temperature stress of different asphalt pavement structures. In order to reduce the temperature stress of asphalt pavement, Asphalt Pavement Structure from Lhasa to Gonggar Airport Highway. The results show that the temperature stress of asphalt pavement decreases gradually along the thickness of the structural layer and the lagging moment of the maximum and minimum of the asphalt pavement lags behind and the temperature stress of the base layer is very small. When the lower layer adopts the ATB-25 structure or the cement The addition of graded macadam layer on the top surface of stabilized macadam layer can effectively reduce the temperature stress of asphalt pavement. The temperature stress of pavement structure with the addition of graded macadam layer is most obvious. After comprehensively considering the temperature stress of asphalt pavement and the construction conditions in Tibet, it is recommended to set a 10cm graded crushed stone layer in the pavement structure of Lhasa to Gonggar Airport so as to reduce the problem of low temperature shrinkage on asphalt pavement.