高速车辆动载下双块式无砟轨道离缝积水动水压力时空变化特性

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英文篇名：Temporal-spatial variation of dynamic water pressure at interface crack of double-block ballastless track under high-speed vehicle dynamic loads 作者：王明昃 ; 蔡成标 ; 朱胜阳 ; 何庆烈 ; 张嘉伟 英文作者：WANG MingZe;CAI ChengBiao;ZHU ShengYang;HE QingLie;ZHANG JiaWei;State Key Laboratory of Traction Power,Southwest Jiaotong University; 关键词：高速铁路 ; 双块式无砟轨道 ; 流固耦合 ; 动水压力 ; 层间离缝 ; 时空变化 英文关键词：high-speed railway;;double-block ballastless track;;fluid-structure interaction;;dynamic water pressure;;interface crack;;temporal-spatial variation 中文刊名：JEXK 英文刊名：Scientia Sinica(Technologica) 机构：西南交通大学牵引动力国家重点实验室; 出版日期：2018-12-12 13:19 出版单位：中国科学:技术科学 年：2019 期：v.49 基金：国家自然科学基金(批准号:51708457,11790283,51778194);; 四川省科技计划项目(编号:2017GZ0088,2017JY0215)资助 语种：中文; 页：JEXK201906011 页数：8 CN：06 ISSN：11-5844/TH 分类号：111-118

摘要

本文结合车辆-轨道耦合动力学方法与流固耦合方法,建立了双块式无砟轨道离缝积水动水压力计算模型,分析了离缝形态及积水状态对动水压力的影响规律、车辆荷载作用下离缝积水动水压力的时空分布特点以及考虑动水压力时空变化的参数影响规律.结果表明:高速车辆通过计算截面时,动水压力将达到最大正、负压值,离缝动水压力沿轨道横向的分布较为复杂,不同深度处离缝积水动水压力变化并不一致,采用单点动水压力变化难以表征整个离缝区域积水动水压力特性,可采用分区域加载的方法;将动水压力向离缝尖端点简化,得到的主矢和主矩可描述空间分布的动水压力整体的力学作用,同时主矢和主矩随时间的变化也反映了动水压力作用的时变特点;当离缝渐深、离缝高度渐小以及列车运行速度渐增时,动水压力主矢和主矩逐渐增大;离缝深度超过0.9 m时,动水压力对道床板向上的作用将超过钢轨支点压力对道床板向下的作用,将加速无砟轨道层间损伤.
        By combining the vehicle-track coupled dynamics method and the fluid-structure coupled method, an analysis model for predicting dynamic water pressure(DWP) at the interface crack of double-block ballastless track is developed in this work. The influence of the interface cracking and interface water states on the DWP, the temporal-spatial distribution characteristics due to vehicle dynamic loads, and the parameters influence law with considering the temporal-spatial variation of the DWP are analyzed in details. Results show that the DWP reaches the maximum positive and negative pressures when a high-speed vehicle passes the calculation section;the distribution of the DWP along the lateral direction is complicated, the variations of the DWP at different crack depths are different, so that it is difficult to represent the DWP characteristics by using the DWP at a single point, and the method of partition loading can be adopted; By simplifying the dynamic water pressure to the point at the interface crack tip, the obtained principal vector and principal moment can not only describe the overall mechanical behavior of the spatial distributed DWP, but also their variation with the time reflect the time-varying characteristics of the DWP; the principal vector and principal moment gradually increase with the increases the interface crack depth and the vehicle running speed, as well as the decrease of the interface crack height; the upward action of the DWP on the track slab will exceed the downward action of the bearing pressure at rail supporting point on the track slab,which would accelerate the interface damage the ballastless track.

引文

1西南交通大学,中铁二院工程集团有限责任公司,成都铁路局,等.无砟轨道系统病害现场调查和分类.技术报告.2013
    2翟婉明,赵春发,夏禾,等.高速铁路基础结构动态性能演变及服役安全的基础科学问题.中国科学:技术科学,2014,44:645-660
    3陈潇.双块式无砟轨道路桥过渡段道床板与支承层离缝原因分析及处理措施研究.铁道勘测与设计,2012,1:30-34
    4 Qian C,Huang B,Wang Y,et al.Water seepage flow in concrete.Construct Build Mater,2012,35:491-496
    5 Segura J M,Carol I.Numerical modelling of pressurized fracture evolution in concrete using zero-thickness interface elements.Eng Fract Mech,2010,77:1386-1399
    6王海龙,李庆斌.湿态混凝土抗压强度与本构关系的细观力学分析.岩石力学与工程学报,2006,25:1531-1536
    7徐桂弘,杨荣山,刘学毅.荷载幅值对无砟轨道结构裂纹水压力影响.铁道工程学报,2015,32:32-37
    8杨荣山,曹世豪,谢露,等.列车荷载与水耦合作用下的无砟轨道水力劈裂机理分析.铁道学报,2017,39:95-103
    9徐桂弘,刘学毅,杨荣山,等.列车荷载-水耦合作用下CRTSⅡ型板式无砟轨道道床裂纹扩展研究.铁道学报,2014,10:76-80
    10 Rubinstein R,Barton J M.Nonlinear Reynolds stress models and the renormalization group.Phys Fluids A-Fluid Dyn,1989,2:1472-1476
    11吴光中,宋婷婷,张毅.FLUENT基础入门与案例精通.北京:电子工业出版社,2012
    12翟婉明.车辆-轨道耦合动力学.第4版.北京:科学出版社,2015
    13曹世豪,杨荣山,刘学毅,等.无砟轨道层间裂纹内动水压力特性分析.西南交通大学学报,2016,51:36-42
    14柯乃普R T,戴利J W,哈密脱F G.水利水电科学研究院,译.空化与空蚀.北京:水利出版社,1981