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以武汉长江隧道工程为依托,建立了隧道匝道明挖段沥青复合路面结构二维热分析几何模型,分析了在持续高、低温情况下复合路面结构的温度场分布及温度应力变化规律。研究表明:在持续高低温天气条件下沥青复合路面温度逐渐累积,沥青复合材料的应力松弛性难以发挥,路面结构应变能降低,应力急剧增加,沥青下面层最大温度应力可达3 MPa;要求重视隧道沥青复合路面结构设计,并相应提高沥青下面层材料的热稳定性和抗开裂性能。
Based on the Wuhan Yangtze River Tunnel Project, a two-dimensional thermal analysis geometric model of asphalt pavement structure in the tunnel cutoff section was established. The temperature field distribution and temperature stress variation of the pavement structure under continuous high and low temperature conditions were analyzed. The results show that under the condition of continuous high and low temperature, the temperature of asphalt pavement gradually accumulates, the stress relaxation of asphalt composites is hard to be exerted, the strain energy of pavement structure decreases and the stress increases sharply. The maximum temperature stress of asphalt underlayers can reach 3 MPa. Tunnel asphalt composite pavement structure design and correspondingly improve the thermal stability and anti-cracking performance of asphalt under-layer material.