多级/多频列车荷载-湿化耦合作用下有砟轨道路基翻浆冒泥颗粒迁移及动力特性研究

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中文摘要：多级/多频列车荷载-湿化耦合作用下有砟轨道路基翻浆冒泥路基病害严重影响铁路正常运营,其发生机制尚不明确.开展多级/多频列车荷载-湿化耦合作用(MSC-W/MFC-W)下,有砟轨道路基翻浆冒泥模型试验.试验结果表明:在非饱和状态下,2种工况均无显著颗粒迁移现象产生,MSC-W工况下的累积轴向变形较MFC-W工况更加显著;饱和或接近饱和状态下,2种工况均在动孔隙水压力驱动下产生显著翻浆冒泥现象,MFC-W工况的翻浆冒泥程度、细颗粒层位移、道砟污染指数均显著高于MSC-W工况;对于降雨频繁的既有线铁路进行提速改造时要特别重视路基翻浆冒泥病害防控.

外文标题：Study on mud pumping particles migration and dynamic characteristics of ballasted track subgrades under multi-stage/multi-frequency train loading-wetting coupling

外文摘要：The mud pumping disease under multi-stage/multi-frequency train loading-wetting coupling seriously affects the normal operation of railways,and its mechanism is still unclear.The model test study on the mud pumping particle migration and dynamic characteristics in ballasted track subgrade under multi-stage/multi-frequency train loading-wetting(MSC-W/MFC-W)coupling was carried out.The test results show that under the unsaturated state,there is no significant particle migration phenomenon in the two working conditions,the accumulated axial deformation under the MSC-W working condition is more significant than that under the MFC-W working condition;Under the saturated or near saturated condition,the two working conditions result in significant mud pumping phenomenon by the driving force of dynamic pore water pressure.The mud pumping degree,fine particle layer displacement and ballast fouling index under MFC-W working condition are significantly higher than those under MSC-W working condition;Thus,special attention should be given to the prevention and control of subgrade mud pumping during the speed-raising reconstruction of the existing railway with frequent rainfall.

外文关键词：

soil mechanicsballasted track subgrademodel testmulti-stage/multi-frequency cyclic loadingaccumulated axial deformationparticle migrationdynamic pore water pressuremud pumping

作者：

韩博文、蔡国庆、落宇杰、张国光、单冶鹏

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作者单位：

石家庄铁道大学交通运输学院,河北石家庄 050043

石家庄铁道大学河北省交通安全与控制重点实验室,河北石家庄 050043

石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄 050043

北京交通大学城市地下工程教育部重点实验室,北京 100044

北京交通大学土木建筑工程学院,北京 100044

中国铁路济南局集团有限公司,山东济南 250000

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关键词：

土力学有砟轨道路基模型试验多级与多频循环荷载累积轴向变形颗粒迁移动孔隙水压力翻浆冒泥

基金：

中央高校基本科研业务费项目国家自然科学基金资助项目国家自然科学基金资助项目

项目编号：

2023JBZD004U203420452078031

出版年：

2024

DOI：

10.13722/j.cnki.jrme.2023.1084

岩石力学与工程学报

中国岩石力学与工程学会

岩石力学与工程学报

CSTPCD北大核心

影响因子：2.589

ISSN：1000-6915

年,卷(期)：2024.43(6)