考虑地表变形的轨道-土体空间映射关系分析与车致振动评估  

Analysis of track-soil spatial mapping relationship and evaluation of vehicle-induced vibrations considering deformation of ground

作　　者：李正 徐磊[1,2] 王卫东 LI Zheng;XU Lei;WANG Weidong(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center of High-speed Railway Construction Technology,Changsha 410075,China;MOE Key Laboratory for Heavy-haul Railway Engineering Structures,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]高速铁路建造技术国家工程研究中心,湖南长沙410075 [3]中南大学重载铁路工程结构教育部重点实验室,湖南长沙410075

出　　处：《铁道科学与工程学报》2024年第12期5005-5017,共13页Journal of Railway Science and Engineering

基　　金：中南大学创新驱动项目(2023CXQD072);国家自然科学基金资助项目(52378468);中国中铁重大专项(2021-Special-08,2023-Special-07);湖南省自然科学基金资助项目(2022JJ20071);中国科学青年人才托举工程项目(2020-2022QNRC002)。

摘　　要：针对地表变形下的无砟轨道结构与土体之间的变形空间映射关系,分析地表变形诱发轨道附加变形激励下的车辆-轨道-土体耦合振动问题。基本的分析框架由2个模型组成:1)车辆-轨道-土体动力相互作用模型;2)轨道结构-土体变形空间映射分析模型。模型1是本文动力响应分析的基本模型,是以经典的轮轨接触理论和有限元矩阵耦合方法为基础建立的。模型2用于分析轨道-土体变形空间映射关系,引入了增量法和迭代法用于处理轨道-土体接触/分离的非线性关系,并与ANSYS模型进行了验证。模型2计算得到的轨道结构在地表变形条件下产生的轨道附加变形和层间脱空被视为动力相互作用模型1的外部几何激励,在融合了经典的轨道不平顺激励的基础上分析长波轨道附加变形和层间动态接触对车致振动的影响。在算例中,以广州某城际铁路地表融沉问题为案例,分析轨道结构的附加变形与地表融沉之间的映射关系,并从动力相互作用的角度探讨地表融沉条件下的系统耦合振动规律。仿真结果表明,轨道结构附加变形与地表融沉之间有着较强的关联关系,但轨道与地表的层间并不会完全处于接触状态,而是存在局部的脱空。系统的振动在层间脱空较大处有着明显的增强,其长波低频部分是由刚度缺失造成。此外,车辆的运行安全性和舒适性在地表融沉区域也发生了不同程度的恶化。This paper focuses on the deformation spatial mapping relationship between ballast track structure and soil under ground deformation,besides,the vehicle-track-soil coupled vibration problem under the ground deformation-induced additional track deformation excitation was analyzed.The basic analysis framework consists of two models:1)the vehicle-track-soil dynamic interaction model;and 2)the track-soil deformation spatial mapping analysis model.Model 1 was the basic model for the dynamic analysis in this paper,which was established based on the conventional wheel-rail contact and finite element couplingmethods.Model 2 was used to analyze the track-soil deformation spatial mapping relationship,and the incremental and iterative methods were introduced for dealing with the nonlinear relationship of track-soil contact/separation,and verified with the ANSYS model.The ground deformation-induced additional track deformation and interlayer void were calculated by model 2,and were regarded as the external geometric excitation of the dynamic interaction model 1.The effects of long-wavelength additional track deformation and the interlayer dynamic contact on the vehicle-induced vibrations were analyzed based on the integration of the conventional track irregularity excitation.In the case studies,the mapping relationship between the additional deformation of the track structure and the ground deformation was analyzed by taking the surface settlement problem of a certain railway line in Guangzhou as a case study,and the coupled vibration law of the system under the condition of surface deformation was revealed from the viewpoint of dynamic interaction.The simulation results show that there is a strong mapping relationship between the additional deformation of the track structure and the soil settlement,but the interlayer between the track and the surface will not be completely in the contact state,but there is a localized void.The vibration of the system has obvious enhancement at the larger interlayer void area,in which the lo

关 键 词：车辆-轨道-土体动力相互作用 空间映射 层间非线性 增量法 迭代法 

分 类 号：U213.2[交通运输工程—道路与铁道工程]