考虑层间状态的沥青面层动应变疲劳数值分析

为确定沥青层疲劳寿命与层间接触状态、温度和轴载荷等因素之间的关系，运用ABAQUS有限元软件，建立了考虑层间状态的沥青路面结构数值计算模型，分析了这些因素对沥青层底动应变的影响规律；通过引入常用的沥青路面疲劳寿命模型，构建了适用于半刚性沥青路面的沥青层或超薄路面的沥青层在多因素作用下的疲劳方程一般表达式，确立了沥青层疲劳寿命与各影响因素间的作用关系及其最不利点位.研究结果表明:层间结合系数、温度、轴载荷均对沥青面层疲劳寿命具有明显影响，且分析点位不同，影响程度不同；加强层间粘结能显著提高沥青面层疲劳寿命，在最不利分析点位处，当层间结合系数由0.5增大到0.7时，疲劳寿命提高13.6倍. 

Numerical Analysis of Dynamic Strain and Fatigue Characteristics of Asphalt Layer Considering Interlayer Condition

In order to determine the relationship between the fatigue life of asphalt layer and its influencing factors such as interlayer contact state, temperature, and axle load, a numerical calculation model of asphalt pavement was built based on the interlayer conditions by using the ABAQUS software. Through this model, the influence of these factors on the dynamic strain of the asphalt layer was analyzed. Then, the conventional fatigue life model of asphalt pavement was introduced to construct general fatigue equations for the asphalt layer of semi-rigid asphalt pavement or ultra-thin pavement subjected to multiple factors, and the correlation of fatigue life with the influencing factors and the most unfavorable point were determined. The results show that the interlayer bonding coefficient, temperature, and axle load all have significant effect on the fatigue life of asphalt layer, but the effect differs at different calculation points. Strengthening the interlayer bonding condition can improve the fatigue life of the asphalt layer: at the most unfavorable point, when the interlayer bonding coefficient is improved from 0.5 to 0.7, the fatigue life is increased by 13.6 times.