多尺度效应作用下风沙区铁路道床动力响应分析  

Dynamic response analysis of railway ballast bed under multi-scale effect in sandstorm area

作　　者：张智海 肖宏[1] 冯瑞玲[1] 崔旭浩 ZHANG Zhihai;XIAO Hong;FENG Ruiling;CUI Xuhao(Beijing Key Lab of Track Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学轨道工程北京市重点实验室,北京100044

出　　处：《铁道科学与工程学报》2020年第7期1671-1678,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51578055,51978045)。

摘　　要：针对风沙区铁路道床多尺度无黏性颗粒材料分布特征,率先采用“颗粒重叠组构法”快速构建轨枕-道床离散元仿真模型,开展风沙铁路轨枕位移动测试验,分析沙粒侵入对道床动力响应的影响。研究结果表明:风沙道床轨枕位移量小,道床内部最大接触力小;随着侵沙深度的变化,荷载作用阶段道床最大接触力可减少约41.67%,卸载阶段最大接触力可增加约2.817 kN;沿着道床深度方向,道床振动加速度逐渐变小,普通无沙道床振动剧烈;随着沙粒侵入深度的增加,道床顶面应力逐渐减小,而道床底面应力逐渐增大,道床应力趋于均匀化。The railway ballast bed was composed of multiscale non-viscous granular materials in sandstorm area.The sleeper-ballast bed discrete element simulation model was constructed by particle overlapping fabric method.The dynamic displacement test of railway sleeper was carried out.The influence of sand intrusion on dynamic response of ballast bed was analyzed.The results show that the sleeper displacement and the maximum contact force are smaller.With the change of sand penetration depth,the maximum contact force of ballast bed can reduce about 41.67%in loading stage and increase about 2.817 kN in unloading stage.Along the depth of the ballast bed,the vibration acceleration of the ballast bed decreases gradually,and the vibration of the ballast bed without sand become more intense.With the increase of sand penetration depth,the stress on the top of the ballast bed decreases gradually,while the stress on the bottom of the ballast bed increases gradually,and the stress tends to be uniform.

关 键 词：有砟道床 多尺度效应 离散单元法 动力响应 

分 类 号：U213.7[交通运输工程—道路与铁道工程]