高速铁路无砟轨道桥梁基础变形对行车的影响

发布时间：2018-10-25 20:55

【摘要】：研究目的:针对高速铁路无砟轨道桥梁基础(桥墩)变形引起桥上轨道附加不平顺,进而对列车运行产生影响的问题,本文以单元板式无砟轨道系统为对象,分别建立轨道-桥梁上部结构-支座-桥墩数值仿真子模型,以及车辆-轨道耦合动力作用子模型,计算并分析桥墩不同变形模式和量值对高速铁路行车的影响。研究结论:(1)桥墩变形对行车的影响与列车速度有关,列车速度越高,其影响越大;(2)桥墩横向变形对行车的影响大于桥墩沉降所产生的影响,桥墩同时发生沉降和横向变形情况下,行车安全性主要受横向变形的影响;(3)桥梁跨径减小,各行车评价指标增大,尤其当桥墩横向变形大于10 mm的情况下;(4)对于32 m标准跨径桥梁,桥墩沉降不超过20 mm,行车安全性和舒适性指标均未超过限值,但是当桥墩横向变形达到15 mm时,列车高速运行下行车安全性指标已超过限值;(5)该研究结论对高速铁路桥梁基础变形的管理与控制具有一定的指导意义。
[Abstract]:The purpose of this paper is to solve the problem that the deformation of ballastless track bridge foundation (pier) of high-speed railway causes the additional irregularity of the track on the bridge and then affects the train operation. This paper takes the unit board ballastless track system as the object. The numerical simulation submodels of track-bridge superstructure-support-pier and the vehicle-track coupling dynamic submodel are established respectively. The influence of different deformation modes and values of bridge pier on high-speed railway operation is calculated and analyzed. The conclusions are as follows: (1) the influence of bridge pier deformation on train speed is related to the train speed. The higher the train speed, the greater the impact; (2) the influence of bridge pier lateral deformation on driving is greater than that on bridge pier settlement. In the case of bridge pier settlement and lateral deformation, the driving safety is mainly affected by transverse deformation; (3) the span of the bridge decreases and the evaluation index increases, especially when the lateral deformation of the pier is more than 10 mm; (4) for the 32 m standard span bridge, the settlement of the pier is not more than 20 mm, driving safety and comfort index, but when the lateral deformation of the pier reaches 15 mm, the train safety index has exceeded the limit value under the high speed operation of the train; (5) the conclusion of this study has certain guiding significance for the management and control of bridge foundation deformation of high speed railway.
【作者单位】：北京交通大学;同济大学道路与交通工程教育部重点实验室;国家铁路局工程监督管理司;
【基金】：铁道部科技研究开发计划项目(J2011G005)
【分类号】：U213.244;U443.1

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