论文部分内容阅读
就轨道结构理论研究来说,过去多注重于钢轨强度计算和刚性轨下基础设计等方面,而对道床和路基的计算原理和方法的研究则重视不够。由于道床和路基是轨道结构最薄弱的环节,轨道的变形乃至最后的破坏,主要原因都是道床路基变形和破坏的结果。因此,有必要加强对这一问题的研究。本文应用空间有限元法的基本原理,结合道床路基的实际情况,提出了一种计算道床路基应力以及进行稳定和振动分析的新方法。即道床路基的动力空间有限元计算法。通过理论计算和试验验证,证实该方法是正确可行的。笔者采用自由振动衰减法测定了道床路基的阻尼参数,有理论和实用价值。
In the field of orbital structure theory, more attention has been paid to the calculation of rail strength and the foundation design of rigid rails in the past, while the research on the calculation principle and method of ballast bed and embankment has paid insufficient attention. As the ballast bed and subgrade are the weakest link structure, the deformation and even the final destruction of the track are mainly caused by the deformation and destruction of the ballast bed. Therefore, it is necessary to strengthen the research on this issue. In this paper, the basic principle of the spatial finite element method is introduced, and a new method of calculating the stress of ballast bed and analyzing the stability and vibration of the ballast bed is proposed. That is, the dynamic space finite element method of roadbed subgrade. Through theoretical calculation and experimental verification, this method is proved to be correct and feasible. The author uses free vibration decay method to determine the damping parameters of ballast bed, which has theoretical and practical value.