高速铁路CRTSⅢ型板式无砟轨道减振垫层动力影响及结构优化

Dynamic Effects and Structure Optimization of Damping Layers of CRTSⅢ Slab Ballastless Track for High Speed Railway

针对我国高速铁路CRTSⅢ型板式无砟轨道减振垫层位置的不同设置方案,运用自主开发的FORSYS仿真平台,建立高速列车—CRTSⅢ型无砟轨道耦合系统动力分析模型;利用谐响应分析方法,对减振垫层不同设置位置条件下钢轨、轨道板及路基的位移导纳进行分析;利用车辆—轨道耦合分析方法,分析列车高速通过时轨道系统的动力响应,进行CRTSⅢ型板式无砟轨道减振垫层的动力影响及结构优化研究。结果表明：CRTSⅢ型板式无砟轨道减振垫层的动力影响主要体现在轨道板和路基上;在自密实混凝土和底座板下设置减振垫层均可以起到减振作用,减振效果主要体现在振动频率为100～200Hz的范围内,而且减振垫层设置在底座板下时减振效果更优;综合考虑减振效果和变形控制2个方面,建议减振垫层的刚度取值为50～80MPa·m-1。

Aiming at different designs for damping layer locations in CRTSⅢslab ballastless track for high speed railway in China,the dynamic analysis model for high speed train and CRTSⅢ ballastless track coupled system was established based on a self-developed simulation platform FORSYS.The displacement receptances of rail,track slab and subgrade at different set locations of damping layers were analyzed by using harmonic response analysis method.The dynamic responses of track system during high speed trains passing were obtained by using vehicle-track coupled analysis method.The dynamic effects and structure optimization of damping layers of CRTSⅢ slab ballastless track for high speed railway were studied.Results show that the dynamic effects of the damping layers of CRTSⅢslab ballastless track are mainly on track slab and subgrade.The vibration can be reduced when the damping layer is either installed under self-compacting concrete or under base slab.The effects of vibration reduction mainly reflect in a vibration frequency range of 100 Hz to 200 Hz.The effects are more obvious if the damping layer is installed under the base slab.Comprehensively considering vibration reduction and displacement control,the stiffness of damping layer ranging from 50 MPa·m-1 to 80 MPa·m-1 is recommended.