首页|基于DEM-FDM耦合的过渡段膨胀诱发钢轨上拱研究

基于DEM-FDM耦合的过渡段膨胀诱发钢轨上拱研究

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研究目的:为分析涵洞过渡段地基膨胀引起的钢轨上拱响应,基于现场测试、室内膨胀试验数据,开展DEM-FDM耦合数值模拟,分析某涵洞附近路基土在膨胀范围为16 m,膨胀中心距离涵洞中心分别为0 m、5 m、10 m这三种工况下,不同膨胀率时基床填料的运动规律及钢轨的上拱响应.研究结论:(1)涵洞对于钢轨上拱位移的传递存在阻断作用,但会增大钢轨上拱的峰值,原位膨胀率下工况二的钢轨上拱峰值达到46 mm,当路基膨胀率为0.3％时钢轨上拱位移量达到无砟轨道钢轨可调节临界值(4 mm);(2)过渡段钢轨上拱处同时产生轴向应力集中,其中原位膨胀率下工况二轴向应力峰值达到14.4 MPa;(3)对于膨胀区域位于涵洞下方的工况,钢轨轴向应力呈现出来的分布规律为钢轨上拱拱顶处为主拉应力状态,拱脚处为主压应力状态,因此一共包括三个压应力峰值点以及两个拉应力峰值点;(4)本文研究可为高铁涵洞过渡段路基膨胀病害解决方案的确定提供理论依据.
Research on Rail Heave Induced by Foundation Swelling in Culvert Transition Section Based on DEM-FDM Coupling Method
Research purposes:In order to analyze the response of rail heave caused by foundation swelling in the transition section of culvert,DEM-FDM coupled numerical simulation was carried out based on the in situ monitoring and laboratory swelling data.The movement law of the subgrade filler and the arch response of the rails were studied under three working conditions with different swelling rates in the swelling range of 16 m and the expansion center distance from the culvert center of 0 m,5 m and 10 m respectively in the vicinity of a culvert.Research conclusions:(1)The culvert has a blocking effect on the transfer of the rail heave displacement,but it will increase the peak value of the rail heave,the peak value of the rail heave of case-2 reaches 46 mm under the in-situ expansion rate,and the rail heave displacement reaches the adjustable critical value(4 mm)of the ballastless rail when the foundation swelling rate is 0.3％.(2)The railway heave of the transition section simultaneously produces axial stress concentration,and the peak value of case-2 axial stress under the in-situ swelling rate reaches 14.4 MPa.(3)For the condition that the swelling area is located under the culvert,the axial stress of the rail presents the distribution law of the tensile stress state at the top arch and the compressive stress state at the foot of the arch,so it includes three peak compressive stress points and two peak tensile stress points.(4)This study can provide a theoretical basis for determining the solution of the expansion disease of the subgrade in the transition section of the high-speed railway culvert.

transition sectionfoundation swellingballastless trackrail heavefinite difference methoddiscrete element method

汪优、高天涯、闫斌、王瑞、陈子娟、张文旭、程建军

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中南大学,长沙 410075

九江学院,九江 332005

石河子大学,石河子 832003

过渡段 路基膨胀 无砟轨道 钢轨上拱 有限差分 离散元

国家自然科学基金国家自然科学基金国家自然科学基金湖南省自然科学基金广州地铁设计研究院股份有限公司科研立项项目(2022)中国铁建股份有限公司科技研发计划(2022)中铁二局集团有限公司科技研发计划

5177863351308552522784702022JJ30741KY-2022-0142022-C12022-B-4

2024

铁道工程学报
中国铁道学会 中国铁路工程总公司 中国中铁股份有限公司

铁道工程学报

CSTPCD北大核心
影响因子：0.996
ISSN：1006-2106
年,卷(期)：2024.41(1)
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