Research methods:The main research contents include:(1)the experimental research of dynamic characteristics of subgrade bed of ballastless track;
研究方法：主要研究内容包括：（1）无碴轨道路基基床动力学特性试验研究；
There are not only enough subgrade bed strength, but also appropriate subgrade bed stiffness to satisfy with the safety and comfort under the high-speed train loading.
基床不仅需要具有足够强度以承受高速列车荷载动力作用，而且需要具有合适刚度与以满足高速列车行驶时安全舒适运行的要求。
Train velocity has little influence on the dynamic stress and dynamic deformation of subgrade bed, but has obvious influence on vibrating velocity and vibrating acceleration.
列车运行速度对振动速度、振动加速度的影响比对动应力、动变形的影响更显著。
The paper introduces the property of essentials for construction of expansive soil subgrade, choice of schemes for finely paving coverage of road bed and construction procedure.
介绍了膨胀土的特性、膨胀土路基施工要点、路床精铺层方案的选择及施工程序。
Road bed is the subgrade on which are laid the ballast, ties and rails.
路基就是上面铺着道渣，枕轨和钢轨的底基。
Based on the author's years of supervising work experience for municipal concrete road, the article will focus on quality control essentials during the construction of road bed, subgrade and surface.
文章结合作者多年监理工作经验介绍市政混凝土道路施工阶段对路床、基层、面层质量监理控制要点。
The crack at the middle of the track bed has more effect on dynamic bending stress of track bed and dynamic stress of subgrade than crack at other location.
道床动弯应力和路基面动应力随车辆速度的增大而增大，道床中部裂纹对道床动弯应力和路基面动应力的影响更为明显。
The crack at the middle of the track bed has more effect on dynamic bending stress of track bed and dynamic stress of subgrade than crack at other location.
道床动弯应力和路基面动应力随车辆速度的增大而增大，道床中部裂纹对道床动弯应力和路基面动应力的影响更为明显。
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