高铁有砟轨道路基动应力及基床厚度计算分析

Calculation of the Dynamic Stress and Bed Thickness of Ballast-track Subgrade in High Speed Railway

为了解高速铁路有砟轨道路基内部不同深度处列车动压应力的计算方法和路基基床厚度的控制标准,首先将列车轮对动荷载简化成作用在轨枕底的矩形均布荷载后,按布辛尼斯克传递法计算轨枕中心下不同深度处的动压应力,然后对动压应力沿不同深度处的衰减情况和静压应力的比值进行对比分析,最终按动静比小于等于20%控制标准计算了基床总厚度;分析了采用动应力一个参数确定基床表层厚度和基床总厚度的具体控制值,并对计算得出的基床表层厚度和基床总厚度与现行高速铁路设计规范的规定值进行了对比。

In order to understand the calculation method of the dynamic pressure stress of the train at different depths within the subgrade of the high-speed railway and the control standard of the subgrade bed thickness, first the dynamic load of the column wheels is simplified into a rectangular uniform load acting on the bottom of the sleeper, and then the cloth is pressed. The Boussinesq method is used to calculate the dynamic stress at different depths under the center of the sleeper and then the ratio of the attenuation of the dynamic pressure stress at different depths to the static pressure stress is compared and analyzed. Finally, the The total thickness of the foundation bed is calculated as per the control standard that the dynamic-static ratio is less than or equal to 20 %. The specific control value of the surface bed thickness and the total thickness of the foundation bed is analyzes using a parameter of dynamic stress and the calculated thickness of the bed surface and the total thickness of the bed and the specific value of the existing design specification for high-speed railway are compared.