摘要
磁悬浮路基-轨道梁的变形对磁悬浮列车运行的稳定性至关重要。为准确预测轨道梁的竖向变形,基于Kerr地基模型结合两阶段法提出磁悬浮路基-轨道梁竖向变形计算方法。首先计算路基-轨道梁受到的竖向荷载(包括恒载与列车竖向活载),随后将轨道梁视作Euler-Bernoulli梁搁置在三参数Kerr地基模型上,以此模拟轨道梁与下卧路基的相互作用,进而推导轨道梁的竖向变形。通过与现场实测数据进行对比,验证所提方法的合理性,并进一步开展路基设计参数优化分析。分析结果表明:增大路基加固范围可以整体减小轨道梁的竖向变形,当加固范围比超过0.64时,继续增大加固范围对控制轨道梁变形的收益较低;轨道梁竖向变形随加固后路基弹性模量的增加而逐渐减小,当其弹性模量为360 MPa时,加固范围比为0.64的轨道梁变形控制效果比加固范围比为0.48的加固效果仅提升7.22%。
The stability of maglev train operation critically depends on the deformation of the maglev subgrade-track beam.To accurately predict the vertical deformation of track beams,this study introduced a maglev subgrade-track beam vertical deformation calculation method based on the Kerr foundation model and a two-stage approach.Initially,the study calculated the vertical loads on the subgrade-track beam,including permanent and dynamic train loads.Subsequently,it modeled the track beam as an Euler-Bernoulli beam resting on a three-parameter Kerr foundation model to simulate the interaction between the track beam and the underlying subgrade,thereby deriving the vertical deformation of the track beam.Comparisons with field-measured data validated the proposed method.Optimization analysis of subgrade design parameters reveal that increasing the reinforcement range of the subgrade generally reduces the vertical deformation of the track beam.However,benefits of further increasing the reinforcement range in controlling the deformation of the track beam diminish when the reinforcement range ratio exceeds 0.64.As the post-reinforcement subgrade elastic modulus increases,the vertical deformation of the track beam decreases.At an elastic modulus of 360 MPa and a reinforcement ratio of 0.64,the deformation control effect of the track beam shows only a 7.22%improvement compared to a ratio of 0.48.
作者
童立红
管凌霄
罗文俊
TONG Lihong;GUAN Lingxiao;LUO Wenjun(State Key Laboratory of Safety and Resilience of Civil Engineering in Mountain Area,East China Jiaotong University,Nanchang 330013,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)
出处
《铁道学报》
北大核心
2025年第7期225-231,共7页
Journal of the China Railway Society
基金
国家自然科学基金(52225210,52168049,52278350)。
关键词
磁悬浮路基
轨道梁
竖向变形
两阶段法
Kerr地基
maglev subgrade
track beam
vertical deformation
two-phase method
Kerr foundation
