运行条件下车辆⁃轨道⁃路基⁃地基强耦合大系统振动变形精细化分析方法  

Elaborate Analysis Method for Vibration Deformation in Strongly⁃Coupled Vehicle⁃Track⁃Subgrade⁃Foundation Broad System Due to Vehicle Operation

作　　者：薛富春 张建民[2] 马建林[3] 许振浩[4,5] XUE Fuchun;ZHANG Jianmin;MA Jianlin;XU Zhenhao(Department of Tunnelling and Track Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Institute of Geotechnical Engineering,Tsinghua University,Beijing 100084,China;Institute of Geotechnical Engineering,Southwest Jiaotong University,Chengdu 610031,China;Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,China;School of Qilu Transportation,Shandong University,Jinan 250061,China)

机构地区：[1]重庆交通大学隧道及轨道工程系,重庆400074 [2]清华大学岩土工程研究所,北京100084 [3]西南交通大学岩土工程研究所,四川成都610031 [4]山东大学岩土与结构工程研究中心,山东济南250061 [5]山东大学齐鲁交通学院,山东济南250061

出　　处：《应用基础与工程科学学报》2023年第1期81-102,共22页Journal of Basic Science and Engineering

基　　金：国家自然科学基金面上项目(51879153);重庆市2019年留学人员回国创业创新支持计划项目(cx2019161)。

摘　　要：目前国内外用于模拟路基上车辆运行的动力学主流模型有多刚体线弹性模型和多刚体与实体混合模型两类,为克服两类模型的不足,采用精细化建模技术,开发了强非线性强耦合全柔性的车辆⁃轨道⁃路基⁃地基一体化模型,提出了相应的动力学分析方法.该分析方法先模拟场地初始地应力场,而后仿真路基分层填筑和轨道系统的铺设,以此作为车辆运行的起始条件;采用轮轨三维弹塑性滚动接触算法,考虑钢轨整个顶面存在的随机不平顺,在时域内表征车轮与钢轨的动力相互作用;以精度高、鲁棒性好的三维黏弹性静⁃动力统一人工边界模拟无限地基的辐射阻尼和弹性恢复性能;采用经过验证的加速策略来模拟车辆从静止加速到期望速度、并在此后保持该速度恒定运行的完整过程.该方法解决了在具有初始应力应变条件和波动边界条件下路基上车辆运行三维精细化模拟的难题.以路基为例探究了车辆⁃轨道⁃路基⁃地基大系统的振动变形特性,模拟结果验证了该方法的合理性.该分析方法还可用于高速铁路、地铁和重载铁路等领域中,开展车辆与轨道和线下结构(隧道、桥梁和过渡段等)的耦合动力学研究.The two types of popular dynamic models currently simulating vehicle running on subgrade are multiple rigid body model in linear elasticity and multiple rigid⁃solid body hybrid model.The integrated model for fully flexible,strongly nonlinear and strongly⁃coupled vehicle⁃track⁃subgrade⁃foundation was developed using elaborate modelling method to overcome the disadvantages of the two type models mentioned above,and then the dynamic analysis method was proposed.The layer⁃by⁃layer construction of subgrade was modeled after the generation of initial stress state in foundation,and then the track system was placed,which served as the starting condition for vehicle operation.The elastoplastic wheel⁃rail rolling contact algorithm was introduced to describe the dynamic wheel⁃rail interaction in time domain considering the presence of random irregularity distributed across the whole rail top surface.The verified three dimensional viscoelastic static⁃dynamic unified artificial boundary with high precision and robustness was adopted to reflect the radiative damping and elastic recovery of infinite domain.The validated acceleration strategy was used to ensure that the vehicle can accelerate to the expected speed from rest and then keep running at the desired constant speed on the rail all the time.The tough issue with original stress⁃strain condition and wave propagation boundary was then solved in three dimension by this elaborate method.The subgrade was chosen as an example and the vibration deformation characteristics of the vehicle⁃track⁃subgrade⁃foundation coupled broad system is carefully investigated.The simulated results verified the method.Furthermore,the method presented in this paper can also be used in high⁃speed railway engineering,metro engineering and heavy haul railway engineering to conduct the dynamic analysis for coupled vehicle⁃track⁃infrastructure(tunnel,bridge,transition zone,et al).

关 键 词：精细化分析方法 多尺度 强耦合系统 三维弹塑性滚动接触算法 强非线性 振动变形 

分 类 号：U21[交通运输工程—道路与铁道工程]