沥青混合料劈裂疲劳损伤力学特性多尺度研究

Multi-scale research on mechanical characteristics of splitting fatigue damage of asphalt mixture

【目的】探讨多尺度算法在研究沥青混合料劈裂疲劳损伤力学性能方面的有效性。【方法】通过划分5个尺度区域,对5种不同级配的沥青混合料进行多尺度分析,计算不同劈裂疲劳损伤程度下的劈裂强度,并对比分析室内试验与多尺度算法得到的劈裂强度,验证多尺度算法研究沥青混合料劈裂疲劳损伤力学性能的合理性。【结果】集料粒径为1.18~2.36 mm的沥青混合料的劈裂强度有较大幅度的提升;多尺度算法与室内试验得到的劈裂强度相对误差的绝对值均在10%以内,满足工程精度要求。【结论】用多尺度算法研究沥青混合料劈裂疲劳损伤力学性能具有可行性,该算法在实际工程中具有一定的应用价值。

[Purposes]The paper aims to explore the effectiveness of the multi-scale algorithm in studying the mechanical characteristics of splitting fatigue damage of asphalt mixture.[Methods]By dividing five scale areas,the multi-scale analysis of five different gradations of asphalt mixtures was conducted,the splitting strengths were calculated under different fatigue damage degrees,the splitting strengths obtained by the indoor test and the multi-scale algorithm were compared and analyzed to verify the rationality of the multi-scale algorithm in studying the mechanical characteristics of splitting fatigue damage of asphalt mixture.[Findings]The splitting strength of asphalt mixture with aggregate particle size of 1.18-2.36 mm has been greatly improved,the absolute values of relative errors between the splitting strengths obtained by the multi-scale algorithm and that obtained by the indoor test are all within 10%,which meets the engineering accuracy requirements.[Conclusions]The multi-scale algorithm is feasible to study the mechanical characteristics of splitting fatigue damage of asphalt mixture,and has certain application value in practical engineering.