摘要
路基沉降对无砟轨道结构耐久性、线路平顺性、行车舒适性及安全性不利。为研究路基沉降对轨道及行车的影响,基于有限元及车辆-轨道耦合动力学理论建立路基沉降作用下静动力学模型,分析路基沉降对无砟轨道力学性能及列车运行舒适性的影响。基于计算结果,路基沉降敏感波长范围为5~25 m;通过非线性最小二乘法拟合得出车体垂向加速度与波长、幅值的关系公式,进而推导出路基沉降幅值限值计算公式,建议对沉降幅值15 mm以上的路基结构采取处理措施并加强观测,同时应避免产生幅值20 mm以上的沉降。研究结果表明,轨道结构变形、应力、弯矩均随沉降波长、幅值增大而增加;随波长增加车体垂向加速度先增大后减小,随幅值增大近似线性增大。
Subgrade settlement have adverse effects on durability of track structure,smoothness of track,train operation comfort and safety.In order to study the influence of subgrade settlement on track and train,the static and dynamic analysis model under the action of subgrade settlement were established based on the finite element and train-track coupling dynamic theory,and the influence of subgrade settlement on the mechanical properties of ballastless track and train operation comfort were studied.Based on the calculation results,the sensitive wavelength range of subgrade settlement is 5~25 m.The relationship formula of train vertical acceleration,wavelength and amplitude was obtained by the nonlinear least square fitting method,and then the calculation formula of subgrade settlement limit amplitude was deduced.It is suggested that treatment measures should be taken and settlement observation should be strengthened for the subgrade structure with settlement amplitude more than 15 mm,and the subgrade settlement amplitude more than 20 mm should be avoided.The results show that the deformation,stress and bending moment of track structure increase with the increase of subgrade settlement wavelength and amplitude.The vertical acceleration of train increases first and then decreases with the increase of wavelength,and increases approximately linearly with the increase of amplitude.
作者
王聚光
高增增
徐凌雁
李大成
王铁霖
WANG Juguang;GAO Zengzeng;XU Lingyan;LI Dacheng;WANG Tielin(China Railway Design Corporation,Tianjin 300308,China)
出处
《铁道勘察》
2024年第2期147-155,177,共10页
Railway Investigation and Surveying
基金
中国铁路设计集团有限公司科技开发计划重点课题(2022A02238003,2023A0223804,2022BXZ004)。
关键词
高速铁路
路基沉降
无砟轨道
力学性能
舒适性
high-speed railway
subgrade settlement
ballastless track
mechanical properties
comfort
