高速铁路路基结构时变系统耦合动力分析

A Time-varying Coupling Model for Dynamic Analysis of High Speed Railway Subgrade

在车辆的走行过程中,上部与下部是相互作用和影响的,因此,轨道交通问题实际上就是线路上下部结构和车辆系统的体系匹配问题。本文针对列车走行的实际情况,将轨道-路基作为参振子结构纳入车辆计算模型,建立了包含车辆、钢轨、轨枕、道床和路基作为一体的二系垂向耦合动力分析模型。作为模型的验证,结合京秦线提速改造工程进行了列车-路基动力仿真计算,得出在不同行车速度条件下,机车车辆通过路基段加固前后状态下的车体加速度、动轮载、轮重减载率及道床和路基主要动力性能指标,并与实车试验进行对比。试验测试结果验证了理论模型和分析方法的有效性,为高速铁路路基的动力特性分析和设计提供一些参考。

Track transportation can be divided into the track system above and the track system below. While the train is moving, the parts above and below are interacted and mutually influenced. Therefore, the problem of track transportation is actually the matching between the vehicle and the railway line system. In this paper, keeping to the conditions of train running and taking the track-subgrade as a part of the vibration structure of the vehicle model,a vehicle-subgrade model of the secondary suspension vertically coupled system including the vehicle, rail, sleeper, ballast and subgrade is established. Dynamic computer simulation of the vehicle-subgrade system is performed in combination with speed raising reconstruction project of the Jingqin Railway Line as the verification of the model. Regarding the train travelling at different speeds and through subgrade sections ahead of and subsequent to strengthening, dynamic responses such as the acceleration of the vehicle, dynamic wheel load and rate of wheel load reduction and the main dynamic characters of ballast and subgrade are calculated and compared with the experimental results. The effectiveness of the theoretical model and simulation analysis are verified by the test results. Reference is made to analysis of the dynamic characters and design of the subgrade of high-speed railways.