摘要
为研究铁路有砟道床板结对其自身动力特性的影响,利用离散单元法并考虑道砟颗粒的真实外形建立了板结道床的仿真分析模型,分析了脏污板结及板结程度对有砟道床动态响应的影响,并探讨了板结引起道床弹性损失、刚度变大的细观机理.研究结果表明:道床板结会增大道床中道砟颗粒的振动水平,并且板结越严重影响越明显,板结可将道砟颗粒的振动加速度增大20%~30%;板结会加强列车荷载对道床的冲击作用,增大道砟颗粒之间的接触力容易引起道砟颗粒破碎劣化;板结会放大不同位置处道床工作性能的差异,增大道床刚度的不均匀性;道砟颗粒之间的脏污板结材质会抑制道砟颗粒的相对移动,可将道砟颗粒的滑动分数降低至正常的50%左右,减小列车荷载作用下道床整体的宏观变形,从而呈现出刚度增大的特性.
In order to study the influence of hardening railway ballast bed on its own dynamic characteristics,considering the real shape of ballast particles,a simulation analysis model of hardening ballast bed was established by using discrete element method.The influences of dirty hardening and hardening degree on the dynamic response of ballast bed was analyzed,and the meso-mechanism of elastic loss and stiffness increase of ballast bed caused by hardening was discussed.The results show that the hardening will increase the vibration level of ballast particles,and the more serious the hardening is,the more obvious the influence will be,and the hardening can increase the vibration acceleration of ballast particles by 20%−30%.The compaction will strengthen the impact of the train load on the ballast bed,increase the contact force between the ballast particles,which easily causes the ballast particles to break.The working performance of the track bed at different positions was amplified and the unevenness of the ballast bed stiffness was increased by the hardening.Dirty hardening materials between ballast particles can inhibit the relative movement of ballast particles,reduce the sliding fraction of ballast particles to about 50%of the normal value,and reduce the overall macroscopic deformation of the ballast bed under train load,thus showing the characteristics of increased stiffness.
作者
崔旭浩
肖宏
CUI Xuhao;XIAO Hong(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing Key Lab of Track Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《西南交通大学学报》
EI
CSCD
北大核心
2021年第6期1197-1204,共8页
Journal of Southwest Jiaotong University
基金
中央高校基本科研业务费专项资金(2019YJS112)。
关键词
有砟道床
板结
离散单元法
动力响应
ballast bed
hardening
discrete element method
dynamic response
作者简介
第一作者:崔旭浩(1994-),男,博士研究生,研究方向为轨道工程,E-mail:xhcui01@126.com;通信作者:肖宏(1978-),男,教授,研究方向为轨道工程与工务管理,E-mail:xiaoh@bjtu.edu.cn。
