Numerical analysis of dynamic strain and fatigue characteristics of asphalt layer considering interlayer condition

作者：Huang Bing; Ai Changfa^*; Yang Enhui; Cheng Meng

来源：Journal of Southwest Jiaotong University, 2014, 49(4): 682-686.

DOI：10.3969/j.issn.0258-2724.2014.04.019

• Asphalt layer
• Contact conditions
• Correlation analysis
• Dynamic strain
• Fatigue characteristics

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.

• 出版日期2014
• 单位西南交通大学