环境及力学加载条件下沥青混合料水损伤表征

发布时间：2019-02-12 20:56

【摘要】：本文基于室内试验方法和微观力学模型，以表征沥青混合料水损伤特性。沥青路面损伤的评价需考虑环境条件及交通荷载，所以本文设计了水分扩散试验装置以评估沥青砂浆的水分扩散随时间的变化规律，采用沥青砂浆的动态模量作为模型的关键参数，提出了连续的湿度场与力学加载耦合的有限元模型。首先，基于本文设计的水分扩散试验装置评估了沥青砂浆的水分扩散随时间的变化规律，并基于费克定律确定了其水分扩散系数。其次，，测试沥青砂浆动态模量参数用于微观扩散模型材料关键参数。最后，提出连续的湿度场与力学加载耦合有限元模型，以表征湿度扩散对其力学响应分布的影响。因此，本文提出了沥青路面在环境与交通荷载长时间作用条件下的水损伤评价方法，该法考虑了水损伤过程中水分渗透所造成的沥青材料特性衰退。
[Abstract]:In this paper, the water damage characteristics of asphalt mixture are characterized by laboratory test method and micro mechanical model. The damage assessment of asphalt pavement needs to take into account environmental conditions and traffic loads. Therefore, a moisture diffusion test device is designed to evaluate the variation of moisture diffusion with time of asphalt mortar. Taking the dynamic modulus of asphalt mortar as the key parameter of the model, a finite element model of continuous coupling of moisture field and mechanical loading is proposed. Firstly, based on the moisture diffusion test device designed in this paper, the variation law of moisture diffusion with time of asphalt mortar is evaluated, and the moisture diffusion coefficient is determined based on Fecker's law. Secondly, the dynamic modulus parameters of asphalt mortar are tested for the key parameters of micro diffusion model materials. Finally, a coupled finite element model of continuous humidity field and mechanical loading is proposed to characterize the effect of humidity diffusion on its mechanical response distribution. Therefore, this paper presents a method for evaluating the water damage of asphalt pavement under the condition of environment and traffic load for a long time. This method takes into account the degradation of asphalt properties caused by water penetration during the process of water damage.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

【相似文献】