论文部分内容阅读
以武广高铁密集涵洞过渡段为例,建立了列车-轨道耦合的三维动力学分析模型,分析了350km/h高速行车条件下过渡段路基的动力响应特性。分析表明:①过渡段路基基床表层、底层的竖向振动的位移、速度、加速度均在涵洞顶最小,在涵洞侧面出现较快速增长;动应力的变化趋势则与之相反,在涵洞顶最大,涵洞两侧逐渐降低。②动响应沿路基深度呈指数函数形式衰减,基床表层至基床底层衰减较快,路基面下1m左右动响应幅值衰减渐趋于平缓,路基面下3m动响应衰减基本趋于稳定。其中振动加速度衰减最为明显,动位移、振动速度、动应力衰减则相对较缓。现场实车试验测试值与仿真计算值较为接近,表明采用的仿真分析方法较为可靠。
Take the Wuhan-Guangzhou high-speed railway as a culvert culvert transitional section as an example, a three-dimensional dynamic analysis model of train-track coupling was established and the dynamic response characteristics of the transition section under 350km / h high-speed driving condition were analyzed. The analysis shows that: (1) The vertical displacement, velocity and acceleration of the vertical and horizontal subgrade beds in the subgrade of transitional section are both the smallest in the culvert and the more rapid growth in the side of the culvert; the dynamic stress changes in the opposite direction, Culverts gradually decrease on both sides. The dynamic response should attenuate exponentially along the depth of the subgrade. The attenuation from the bed surface to the bottom of the bed is very fast. The attenuation amplitude of dynamic response about 1m under the subgrade surface gradually becomes gentle and the attenuation of 3m dynamic response tends to be stable under subgrade. The vibration acceleration attenuation is the most obvious, dynamic displacement, vibration velocity, dynamic stress attenuation is relatively slow. The field test values of the actual vehicle test are close to those of the simulation, indicating that the simulation analysis method adopted is more reliable.