循环荷载频率和幅值对有砟道床动力行为的影响

崔旭浩,肖宏,金锋

振动与冲击 ›› 2020, Vol. 39 ›› Issue (7) : 116-124.

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PDF(4595 KB)
振动与冲击 ›› 2020, Vol. 39 ›› Issue (7) : 116-124.
论文

循环荷载频率和幅值对有砟道床动力行为的影响

  • 崔旭浩,肖宏,金锋
作者信息 +

Effects of cyclic loading frequency and amplitude on dynamic behavior of ballast bed

  • CUI Xuhao,  XIAO Hong,  JIN Feng
Author information +
文章历史 +

摘要

为研究有砟道床在长期反复列车荷载作用下的动态响应及劣化规律,利用离散元分析软件PFC并考虑道砟的真实外形,建立可考虑道砟破碎劣化的有砟道床离散元计算模型,研究分析了不同频率、不同幅值循环荷载作用下有砟道床的振动响应、道砟受力以及道砟摩擦耗能、破碎行为。结果表明:道砟的振动加速度随动荷载频率和幅值的提高而非线性增长;道砟所受的接触力主要受荷载幅值影响,受荷载频率影响较小,荷载幅值提高,道砟接触力增大;提高荷载频率和幅值均会增加道砟的摩擦耗能,在荷载作用初期,道砟的摩擦耗能有一个突增过程;动荷载的幅值对道砟的破碎行为占主导因素,荷载幅值较低时道砟稳定在较低破碎水平,荷载幅值较高时道砟破碎现象加剧并受荷载频率影响,此时荷载频率越高道砟破碎越严重。
 

Abstract

In order to study dynamic response and deterioration law of ballast bed under long-term repeated train load, the discrete element analysis software PFC was used to establish the discrete element computation model of ballast bed considering ballasts’ true shape, crushing and degradation to analyze vibration responses of ballast bed, forces exerted on ballasts, ballasts’ friction energy-dissipating and crushing behavior under cyclic loads with different frequencies and amplitudes. The results showed that ballasts’ vibration acceleration increase nonlinearly with increase in dynamic load’s frequency and amplitude; contact forces exerted on ballasts are mainly affected by load amplitude, load frequency has a smaller influence on them, the larger the load amplitude, the bigger the ballasts’ contact forces; increase in load amplitude or frequency can add ballasts’ friction energy-dissipating, in initial stage of load acting, ballasts’ friction energy-dissipating has a sudden growth process; load amplitude is the dominant factor on crushing behavior of ballasts, ballasts stay at a lower crushing level when load amplitude is lower; when load amplitude is higher, ballasts’ crushing phenomenon intensifies and is affected by load frequency, the higher the load frequency, the more serious the ballasts’ crushing this moment.
 

关键词

有砟道床
/ 循环荷载 / 频率 / 幅值 / 动力行为 / 离散单元法

Key words

ballast bed / cyclic loading / frequency / amplitude / dynamic behavior / discrete element method

引用本文

导出引用
崔旭浩,肖宏,金锋. 循环荷载频率和幅值对有砟道床动力行为的影响[J]. 振动与冲击, 2020, 39(7): 116-124
CUI Xuhao, XIAO Hong, JIN Feng. Effects of cyclic loading frequency and amplitude on dynamic behavior of ballast bed[J]. Journal of Vibration and Shock, 2020, 39(7): 116-124

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