气态水对路面结构力学响应模拟研究

为探究气态水对沥青路面力学响应的影响规律，利用有限元软件ABAQUS,建立考虑气态水的路面结构三维有限元模型。基于疲劳寿命计算公式与室内试验，分析常规水气浓度场与实际非均匀水气浓度场对路面疲劳寿命的影响差异。结果表明，气态水会影响路面力学指标，常规水气浓度场在计算疲劳寿命时大于路面实际的疲劳寿命，高估了路面结构的抗疲劳能力。室内试验表明，沥青混合料经过气态水的侵蚀后同样会缩短其疲劳寿命，导致路面缺乏安全性，路面在设计及疲劳寿命预估时，引入实际非均匀水气浓度场可提高结果准确性。

Simulation of Mechanical Response of Gaseous Water to Pavement Structure

In order to explore the influence law of gaseous water on the mechanical response of asphalt pavement, a three-dimensional finite element model of pavement structure considering gaseous water was established by using finite element software ABAQUS. Based on fatigue life calculation formula and laboratory test, the influence difference between conventional and actual non-uniform water and air concentration fields on pavement fatigue life was analyzed. The results are as follows. The fatigue life calculation of conventional water-gas concentration field is greater than the actual fatigue life of pavement, which overestimates the anti-fatigue ability of pavement structure. Laboratory tests show that the fatigue life of asphalt mixture after the erosion of gaseous water will also shorten its fatigue life, resulting in the lack of safety of pavement. The actual inhomogeneous moisture concentration field can improve the accuracy of the results.