The mechanical response characteristics of large stone asphalt mixtures (LSAMs) are key factors in studying its fatigue characteristics during cyclic loading tests. Based on disturbed state concept (DSC) and viscoelastic continuum damage model (VECD), a series of tests using an overlay test (OT) were carried out to investigate the fatigue characteristics of LSAM. The results showed that disturbance and damage increased with decreasing frequency and increasing loading displacement and aging degree, while the asphalt content had no obvious adverse effect on the increase in damage. In addition, the disturbance and damage grew rapidly in the early stage of loading and reduced in the later stage of loading. On the contrary, based on DSC, the constitutive model modified with disturbance function (D) defined by external work could describe the mechanical properties, and the evolution process of disturbance function (D) could reflect the damage change in cyclic loading tests. The research conclusion can enrich the theoretical research on the fatigue failure response and mechanism of LSAM under cyclic loading and expand the application scope of DSC in the field of pavement.

中文翻译：

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基于扰动状态概念的大型石料沥青混合料疲劳特性研究

大型石沥青混合料（LSAM）的机械响应特性是研究其在循环载荷测试过程中疲劳特性的关键因素。基于扰动状态概念（DSC）和粘弹性连续体损伤模型（VECD），使用覆盖试验（OT）进行了一系列测试，以研究LSAM的疲劳特性。结果表明，扰动和破坏随着频率的降低，载荷位移和老化程度的增加而增加，而沥青含量对破坏的增加没有明显的不利影响。另外，扰动和破坏在加载的早期迅速增长，而在加载的后期则减小。相反，基于DSC，用干扰函数修正的本构模型（D外部工作定义的）可以描述机械性能，而扰动函数（D）的演化过程可以反映循环载荷测试中的损伤变化。研究结论可以丰富循环荷载作用下LSAM的疲劳失效响应及机理的理论研究，扩大DSC在路面领域的应用范围。