【摘要】 我国高铁建设进入蓬勃发展时期，无砟轨道在工程中的应用更加广泛，服役的环境也愈来愈复杂，如高频强震列车荷载与持续高温、骤冷骤热和高盐高湿等环境因素的耦合作用，无砟轨道的耐久性面临着严重挑战。本文从无砟轨道的应用背景和结构特点出发，针对无砟轨道所服役的环境特点，着重对荷载、温度、氯盐和冻融单一作用以及温度-荷载、氯盐-荷载和冻融-荷载耦合作用的研究进行综述。在以往的研究中，采用试验和数值模拟的方法，揭示了单因素作用下无砟轨道的静力及动力传递特征、无砟轨道的层间位移和各力学参数的演变规律，无砟轨道力学性能的演变直接受到荷载应力水平与加载频率的影响。环境-荷载耦合作用下的无砟轨道的损伤特征及层间变形更为复杂，往往伴随材料软化、刚度退化和层间开裂等现象。本文旨在总结在复杂服役环境下无砟轨道水泥基材料性能演变规律与相应的材料微观结构演变机理，以期为无砟轨道材料设计、结构优化，以及其性能与耐久性的提升提供参考与借鉴。更多还原

【Abstract】 China’s high-speed railway has entered a period of rapid development, the ballastless track is more widely used in engineering, and the environment it serves is becoming more and more complex, such as the coupling effect of high frequency and high cycle fatigue load, continuous high temperature, sudden cooling and heating, high salinity and humidity, and other environmental factors, the durability of ballastless track is facing serious challenges.Based on the application background, the structural characteristics of ballastless track and environmental characteristics of ballastless track, this paper focuses on the study of the single action of load, temperature, chlorine salt and freeze-thaw, as well as the coupling action of temperature-load, chlorine-load and freeze-thaw load.In previous studies, the static and dynamic transmission characteristics of ballastless track, the interlayer displacement of ballastless track and the evolution of various mechanical parameters under the action of single factors were revealed by using experimental and numerical simulation methods.The evolution of mechanical properties of ballastless track is directly affected by the level of load stress and the loading frequency.The damage characteristics and interlayer deformation of ballastless track under the coupled action of environment and load are more complex, which are often accompanied by material softening, stiffness degradation and interlayer cracking.The purpose of this paper is to summarize the evolution law of cement-based material properties and the corresponding material microstructure evolution mechanism under the complex service environment of ballastless track, in order to provide reference for the material design, structural optimization, as well as the improvement of its performance and durability.更多还原