中文摘要：

以路基上双块式无碴轨道为研究跨象，建立钢筋与混凝土纵向相互作用力学模型、蔽块式无碴轨道三雏有限元静力学模型、列车一双块式无碴轨道垂向耦合动力学模型。根据转向温度荷载、混凝土收缩荷载、温度梯度荷载及列车荷载作用下道床板混凝土及钢筋应力时程曲线，运用雨流计数法，得到耦合荷载作用下的应力谱。利用Miner线性疲劳累积损伤准则，结合现有钢筋、混凝土的S-N曲线建立了路基上双块式无碴轨道道床板疲劳寿命预潮模型。以武广客运专线为衡，分析了支承层弹性模量、支承层厚度、遭床板厚度、道床板裂缝阕距、道床板配筋率、道床板配筋方式、道床板混凝土施工温度等因素对路基上双块式无碴轨道道床板疲劳寿命的影响。

英文摘要：

Taking double block ballastless track on subgrade as the investigation subject, three mechanical models were established, which inelude longitudinal interaction mechanical model of steel bar and concrete, 3D finite element static model of double block ballastless trackl train-double block ballastless track vertical coupling dynamic model. According to stress time-dependant curve caused by longitudinal temperature, concrete shrinkage, temperature gradient, and train load, the concrete and steel bar stress spectra of track concrete layer were obtained by rain-flow counting method. According to the existing steel bar and concrete S-N curve, A fatigue life prediction model of double block bal- lastless track concrete layer on subgrade was estalished by Miner linear accumulative damage theory. Taking Wuhan-Guangzhou passenger dedicated railway line as an example, some influencing factors on fatigue behavior of double block ballastless track concrete layer on subgrade are analyzed, such as support layer elastic modulus, support layer thickness, track concrete layer thickness, track concrete layer crack spacing, track concrete layer ratio of steel, track concrete layer steel laying mode, concrete construction tempertature and so on.