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Mechanical characteristic variation of ballastless track in highspeed railway:effect of train–track interaction and environment loads

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Railway Engineering Science 2020年第4期28卷 408-423页

作者： Shengyang Zhu Jun Luo Mingze Wang chengbiao cai Train and Track Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China

Due to the fact that ballastless tracks in highspeed railways are not only subjected to repeated train–track dynamic interaction loads,but also suffer from complex environmental loads,the fundamental understanding of mechanical performance of ballastless tracks under sophisticated service conditions is an increasingly demanding and challenging issue in high-speed railway *** work aims to reveal the effect of train–track interaction and environment loads on the mechanical characteristic variation of ballastless tracks in high-speed railways,particularly focusing on the typical interface damage evolution between track *** this end,a finite element model of a double-block ballastless track involving the cohesive zone model for the track interface is first established to analyze the mechanical properties of the track interface under the loading–unloading processes of the negative temperature gradient load(TGL)followed by the same cycle of the positive ***,the effect of wheel–rail longitudinal interactions on the nonlinear dynamic characteristics of the track interface is investigated by using a vehicle-slab track vertical-longitudinal coupled dynamics ***,the influence of dynamic water pressure induced by vehicle dynamic load on the mechanical characteristics and damage evolution of the track interface is elucidated using a fluid–solid coupling *** show that the loading history of the positive and negative TGLs has a great impact on the nonlinear development and distribution of the track interface stress and damage;the interface damage could be induced by the wheel–rail longitudinal vibrations at a high vehicle running speed owing to the dynamic amplification effect caused by short wave irregularities;the vehicle dynamic load could produce considerable water pressure that presents nonlinear spatial–temporal characteristics at the track interface,which would lead to the interface failure under a certain condition due to t

关键词： Ballastless track High-speed railway Mechanical characteristic Interface damage Train–track interaction Temperature gradient Dynamic water pressure Cohesive zone model

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Damage evolution and dynamic response of cement asphalt mortar layer of slab track under vehicle dynamic load

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Science China(Technological Sciences) 2014年第10期57卷 1883-1894页

作者： ZHU ShengYang FU Qiang cai chengbiao SPANOS Pol D State Key Laboratory of Traction Power Southwest Jiaotong University School of Civil Engineering Central South University Ryon Chair in Engineering Rice University

The damage evolution and dynamic performance of a cement asphalt(CA)mortar layer of slab track subjected to vehicle dynamic load is investigated in this ***,a statistical damage constitutive model for the CA mortar layer is developed using continuous damage mechanics and probability *** this model,the strength of the CA mortar elements is treated as a random variable,which follows the Weibull *** inclusion of strain rate dependence affords considering its influence on the damage development and the transition between viscosity and *** with experimental data support the reliability of the model.A three-dimensional finite element(FE)model of a slab track is then created with the commercial software ABAQUS,where the devised model for the CA mortar is implemented as a user-defined material ***,a vertical vehicle model is coupled with the FE model of the slab track,through the wheel-rail contact forces,based on the nonlinear Hertzian contact *** evolution of the damage and of the dynamic performance of the CA mortar layer with various initial damage is investigated under the train and track *** analysis indicates that the proposed model is capable of predicting the damage evolution of the CA mortar layer exposed to vehicle dynamic *** dynamic compressive strain,the strain rate,and the induced damage increase significantly with an increase in the initial damage,whereas the dynamic compressive stress exhibits a sharp decrease with the increasing initial ***,it is found that the strain rate dependence significantly influences the damage evolution and the dynamic behavior of the CA mortar layer.

关键词： cement asphalt mortar slab track statistical damage constitutive model vehicle-track coupled dynamics damage evolution

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Full-scale multi-functional test platform for investigating mechanical performance of track–subgrade systems of high-speed railways

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Railway Engineering Science 2020年第3期28卷 213-231页

作者： Wanming Zhai Kaiyun Wang Zhaowei Chen Shengyang Zhu chengbiao cai Gang Liu Train and Track Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China MOE Key Laboratory of High-speed Railway Engineering Southwest Jiaotong UniversityChengdu 610031China

Motivated by the huge practical engineering demand for the fundamental understanding of mechanical characteristics of high-speed railway infrastructure,a fullscale multi-functional test platform for high-speed railway track–subgrade system is developed in this paper,and its main functions for investigating the mechanical performance of track–subgrade systems are elaborated with three typical experimental *** the full-scale subgrade structure and all the five types of track structures adopted in Chinese high-speed railways,namely the CRTS I,the CRTS II and the CRTS III ballastless tracks,the double-block ballastless track and the ballasted track,the test platform is established strictly according to the construction standard of Chinese high-speed *** kinds of effective loading methods are employed,including the real bogie loading,multi-point loading and the impact *** types of sensors are adopted in different components of the five types of track–subgrade systems to measure the displacement,acceleration,pressure,structural strain and deformation,*** this test platform,both dynamic characteristics and long-term performance evolution of high-speed railway track–subgrade systems can be investigated,being able to satisfy the actual demand for large-scale operation of Chinese high-speed *** examples,three typical experimental studies are presented to elucidate the comprehensive functionalities of the full-scale multi-functional test platform for exploring the dynamic performance and its long-term evolution of ballastless track systems and for studying the long-term accumulative settlement of the ballasted track–subgrade system in high-speed *** interesting phenomena and meaningful results are captured by the developed test platform,which provide a useful guidance for the scientific operation and maintenance of high-speed railway infrastructure.

关键词： Full-scale test High-speed railway Track–subgrade system Ballastless track Ballasted track Mechanical performance Long-term performance evolution Damage and degradation

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无碴轨道动力学理论及应用

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西南交通大学学报 2007年第3期42卷 255-261页

作者：蔡成标西南交通大学列车与线路研究所四川成都610031

根据车辆-轨道耦合动力学理论,建立了列车与路基上无碴轨道空间耦合动力学模型.模型中将钢轨视为弹性点支承基础上的Bernoulli-Euler梁,将轨道板及混凝土底座视为弹性基础上的弹性薄板.推导了路基上无碴轨道的运动方程.用上述模型及方... 详细信息

根据车辆-轨道耦合动力学理论,建立了列车与路基上无碴轨道空间耦合动力学模型.模型中将钢轨视为弹性点支承基础上的Bernoulli-Euler梁,将轨道板及混凝土底座视为弹性基础上的弹性薄板.推导了路基上无碴轨道的运动方程.用上述模型及方程分析了遂渝线无碴轨道综合试验段路基上板式轨道及过渡段的动力学性能.结果表明,快速客车、重载以及普通货车通过路基上板式轨道时,轮轨垂向力、轮轨横向力、脱轨系数、轮重减载率、以及CA砂浆和路基面动应力等动力学指标均小于许用值.该无碴(板式和双块式)轨道与有碴轨道过渡段在客运列车作用下钢轨挠度变化率均小于许用值(0.300 mm/m),在货物列车作用下略大于许用值.

关键词：无碴轨道板式轨道双块式轨道路基过渡段动力学遂渝线

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Building Nanjing at High Qrality and Upgrading a New Image in a Leaping Manner——An Interview with *** Yongning,Vice Mayor of Nanjing City

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中国周刊 2003年第12期 20-22页

作者： Wang chengbiao,cai Zuping Pan Xuebing

Nanjing has a history of over 2, 470 years and is one of the four ancient cities in China. It is famous for its beautiful mountains, rivers and its history for an ancient capital of six *** is surrounded by mountains, lakes and rivers. Its mountains, lakes, rivers, and forest are integrated into a whole body and the city is noted for its excellent physical geographical

关键词： of on it de in Building Nanjing at High Qrality and Upgrading a New Image in a Leaping Manner An Interview with Mr.Dai Yongning,Vice Mayor of Nanjing City been with

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路基上纵连板式无砟轨道动力特性分析

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西南交通大学学报 2011年第2期46卷 189-194页

作者：徐鹏蔡成标西南交通大学牵引动力国家重点实验室四川成都610031

为研究土质路基上纵连板式无砟轨道动力性能,建立了列车-路基上纵连板式无砟轨道耦合动力学模型.模型中,将纵连板式无砟轨道及路基视为空间层状粘弹性体,采用连续体建模法,建立其运动微分方程并用Galerk in法进行离散变换;分析了CRH2-30... 详细信息

为研究土质路基上纵连板式无砟轨道动力性能,建立了列车-路基上纵连板式无砟轨道耦合动力学模型.模型中,将纵连板式无砟轨道及路基视为空间层状粘弹性体,采用连续体建模法,建立其运动微分方程并用Galerk in法进行离散变换;分析了CRH2-300动车组以300、350 km/h速度运行时,路基上纵连板式无砟轨道的动力特性,并与京-津城际铁路实测结果比较.结果表明：水泥沥青砂浆最大动应力为46.8~50.5 kPa,小于砂浆层设计指标值15 MPa;动变形随深度衰减较慢,动应力随深度衰减较快;单个转向架产生动应力的影响范围沿线路纵向约为5 m、横向约为3.25 m;轨道板、水泥沥青砂浆层和支承层沿深度方向的变形分布差别不大.

关键词：纵连板式无砟轨道路基动力学高速铁路

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高速铁路无砟轨道关键设计参数动力学研究

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西南交通大学学报 2010年第4期45卷 493-497页

作者：蔡成标徐鹏西南交通大学牵引动力国家重点实验室四川成都610031

应用列车-线路耦合动力学理论,分析了高速铁路无砟轨道关键设计参数,包括设计轮重、疲劳检算轮重、轨道合理刚度、路桥过渡段路基面支承刚度、路基不均匀沉降、轨面变形折角及钢轨挠度变化率.结果表明：设计轮重可取为静轮重的3.0倍;疲... 详细信息

应用列车-线路耦合动力学理论,分析了高速铁路无砟轨道关键设计参数,包括设计轮重、疲劳检算轮重、轨道合理刚度、路桥过渡段路基面支承刚度、路基不均匀沉降、轨面变形折角及钢轨挠度变化率.结果表明：设计轮重可取为静轮重的3.0倍;疲劳检算轮重系数可取为1.50;轨下基础刚度的合理范围为20-30 MN/m;路桥过渡段路基面支承刚度的合理值为500-1 000 MPa/m;路基不均匀沉降幅值、轨面变形折角和钢轨挠度变化率应分别控制在波长的1.0‰、1.5‰及0.3 mm/m以下.

关键词：高路铁路无砟轨道列车-线路耦合动力学设计参数

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无砟轨道路基面支承刚度理论计算及应用

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中国铁道科学 2010年第1期31卷 21-26页

作者：徐鹏蔡成标西南交通大学牵引动力国家重点实验室四川成都610031

将无砟轨道路基结构简化成双层弹性体系,基于层状弹性体系力学理论,给出无砟轨道路基面支承刚度的计算方法。应用该方法进行遂渝线无砟轨道试验段路基面刚度计算,并与现场加载试验测试结果进行比较,两者吻合较好,验证了该方法的可行性... 详细信息

将无砟轨道路基结构简化成双层弹性体系,基于层状弹性体系力学理论,给出无砟轨道路基面支承刚度的计算方法。应用该方法进行遂渝线无砟轨道试验段路基面刚度计算,并与现场加载试验测试结果进行比较,两者吻合较好,验证了该方法的可行性。以桥梁路基过渡段为例,将此计算方法应用于无砟轨道典型过渡段的动力性能评估中,进行动力计算。结果表明,该桥梁路基过渡段的钢轨挠度变化率小于0.3 mm.m-1的限值,满足行车要求。运用该计算方法对无砟轨道基床表层及底层变形模量Ev2的合理取值进行研究,结果表明:改变基床表层变形模量对路基面支承刚度影响不大,而改变基床底层变形模量对路基面支承刚度的影响明显;将变形模量Ev2作为压实标准时,对于基床表层和底层,Ev2可分别取为120～260和80～140 MPa。

关键词：无砟轨道路基面支承刚度计算方法变形模量Ev2

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列车—轨道—路基耦合振动及地震条件下行车安全性分析

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中国铁道科学 2014年第2期35卷 125-127页

作者：徐鹏蔡成标铁道第三勘察设计院集团有限公司线站处天津300142 西南交通大学牵引动力国家重点实验室四川成都610031

铁路路基是线路工程中的薄弱和不稳定环节,地震发生将加剧其破坏并威胁行车安全,而我国又是地震灾害较严重的国家之一,因此,针对列车—轨道—路基耦合振动和地震条件下的行车安全问题开展研究,主要研究内容和结论如下.

关键词：列车有砟轨道无砟轨道路基耦合振动地震隔震轨道脱轨两点接触

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ExperimentalVerificationofaDetailedVehicle┐TrackVerticalInteractionModel

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Journal of Modern Transportation 1996年第1期13卷 24-31页

作者： Zhai Wanming cai chengbiao Academy of Engineering Sciences, Southwest Jiaotong University, Chengdu 610031, China

A theoretical model has been developed to investigate vertical dynamic interactions between railway vehicles and tracks. Wheel rail forces and dynamic responses of vehicle and track components can be simulated with the model. The model has been applied to the study of high speed and heavy haul railway dynamic problems. In order to verify the model completely, a full scale field experiment was performed on the Chinese Datong Qinhuangdao railway. Accelerations of rail, sleeper and ballast were measured and compared with the simulated results both in time domain and in frequency domain.

关键词： railway vehicle track wheel rail interaction model verification

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