首页|季冻区无砟轨道损伤变形及其对车轨动力响应的影响研究

季冻区无砟轨道损伤变形及其对车轨动力响应的影响研究

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为探究季冻区无砟轨道损伤变形对行车安全性和轨道服役性能的影响规律,以我国季冻区典型无砟轨道结构为研究对象,基于有限元方法和混凝土塑性损伤本构理论,建立考虑结构配筋的CRTSⅢ型板式无砟轨道精细化非线性分析模型,研究路基冻胀作用下轨道结构的变形和损伤规律;结合多体动力学方法,建立高速车辆-轨道-路基耦合系统动力学模型,分析路基冻胀变形作用下高速铁路车-线-路基耦合系统动力响应.结果表明:冻胀位置对轨道结构伤损变形和离缝的产生和发展影响显著;当冻胀发生在底座板凹槽中间位置时,离缝值最大,当冻胀发生在底座板凹槽位置时,钢轨位移最大;当冻胀发生在底座板伸缩缝位置时,底座板最早产生宏观裂纹;轨道结构的变形损伤和层间离缝随着冻胀幅值增加、冻胀波长减小而增加;底座板相较于其他轨道结构更容易产生损伤,建议将底座板底面波脚产生裂纹的冻胀量作为控制标准;路基不均匀冻胀会加剧轮轨动态相互作用,进而对行车安全性和轨道服役性能产生不良影响;高速铁路的轮轨垂向动力响应随着路基冻胀幅值的增加而增大;20 m冻胀波长以下的冻胀变形及其幅值增大对车轨动力响应影响尤为严重,应予以重视.研究结论以期为季冻区高速铁路路基段基础结构动态性能演变及服役安全提供理论基础和工程指导.
Damage deformation of ballastless track and its influence on dynamic response of vehicle-track in seasonal frozen area
In order to discuss the influence of damage and deformation of ballastless track on driving safety and track service performance in seasonal frozen regions,the typical ballastless track structure in seasonal frozen regions of China was taken as the research object. Based on the finite element method and concrete plastic damage constitutive theory,a refined nonlinear analysis model of CRTS Ⅲ slab ballastless track with considering structural reinforcement was established. The deformation and damage characteristics of track structure under subgrade frost heave were studied. Based on the multibody dynamics method,a dynamic model of the high-speed vehicle-track-subgrade coupled system was established. The dynamic response of the vehicle-track-subgrade coupled system under frost heave deformation of the subgrade was analyzed. The results are drawn as follows. The frost heave position can significantly affect the deformation and development of damage in the track structure and the generation and development of interlayer seam. When frost heave occurs at the middle position of the base plate groove,the interlayer seam value is the largest. When frost heave occurs at the position of the base plate groove,the rail displacement is the largest. When frost heave occurs at the position of the expansion joint of the base plate,macroscopic cracks appear earliest on the base plate. The deformation and damage and interlayer seam value of the track structure increase with the increasing frost heave amplitude,and the decreasing frost heave wavelength. The base plate is more prone to damage compared to other track structures,so it is recommended that the frost heave amount that produces cracks on the bottom of the base plate can be taken as a control criterion. Differential frost heave of the subgrade can intensify the dynamic wheel-rail interaction,which can have adverse effects on driving safety and track service performance. The vertical dynamic response of the wheel-rail interaction on high-speed railways increases with the rising of frost heave amplitude of the subgrade. The frost heave deformation and the increase of its amplitude below 20 m frost heave wavelength have a particularly serious effect on the dynamic response of the track,which should be paid more attention to. The results can provide a theoretical basis and engineering guidance for the dynamic performance evolution and service safety of the basic structural sections of high-speed railways in seasonal frozen regions.

high speed railwayballastless trackplastic deformationfrost heave deformationwheel-rail interactioncoupled vibration

马理超、吴少培、王健壹、李得洋、王剑锋、李国芳

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兰州交通大学 机电工程学院,甘肃 兰州 730070

包头铁道职业技术学院 铁道机车车辆系,内蒙古 包头 014060

高速铁路 无砟轨道 塑性损伤 冻胀变形 轮轨关系 耦合振动

国家自然科学基金国家自然科学基金甘肃省自然科学基金内蒙古自治区高等学校科研项目甘肃省教育厅优秀研究生"创新之星"项目兰州交通大学重点研发项目

121620201226201722JR5RA329NJZZ231072023CXZX-573ZDYF2302

2024

10.19713/j.cnki.43-1423/u.T20231122

铁道科学与工程学报
中南大学 中国铁道学会

铁道科学与工程学报

CSTPCD北大核心EI
影响因子：0.837
ISSN：1672-7029
年,卷(期)：2024.21(5)
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