双线重载铁路路基动力响应规律研究  

Study on Dynamic Response Law of Double-track Heavy-haul Railway Subgrade

作　　者：董俊利 冷伍明[1,2] 徐方[1,2] 张期树[1] 杨奇 刘思慧[1] DONG Junli;LENG Wuming;XU Fang;ZHANG Qishu;YANG Qi;LIU Sihui(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory for High Speed Railway Construction,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中南大学高速铁路建造技术国家工程实验室,湖南长沙410075

出　　处：《铁道学报》2024年第1期145-155,共11页Journal of the China Railway Society

基　　金：国家自然科学基金(51978672);中南大学研究生自主探索创新项目(2021zzts0230);中南大学深化创新创业教育改革研究项目(2020CG039);中国铁路上海局集团有限公司科研课题(杭枢指合[2022]129号)。

摘　　要：建立双线重载线路的轨枕-路基-地基三维有限元仿真模型,分析双线重载路基的动力响应规律。研究发现,列车于本侧轨道下方路基面引起的动应力沿横向均呈“马鞍形”分布。上行线列车通过时,本侧线路钢轨下方路基动应力均随深度的增加而减小;不同运行模式下,路基中心处动应力则均随深度的增加先增大后减小。路基面竖向动位移沿横向呈现明显的凹形分布特性,满载列车单向运行引起的动位移峰值可达到空载列车单向运行的5.36倍。列车轴重对路基速度响应的影响相对较小;轴重由25 t增至30 t时,本侧线路钢轨下方路基面处加速度峰值增加约10%。双线列车运行引起的路基动力响应水平大于单向列车运行的工况;上行线满载列车在下行线钢轨下方路基面引起的加速度、速度和动位移峰值均大于空载列车单向运行于下行线的工况。A three-dimension sleeper-subgrade-foundation finite element model was established to investigate the dynamic response law of the double-track heavy-haul railway subgrade.The results show that the dynamic stress at the subgrade surface below the train running track presents a saddle-shaped distribution along the transverse direction.The dynamic stress below the upline rail decreases with the increase of the depth when a train passing through the upline,whereas,the dynamic stress at the center of the subgrade under different operation modes increases first before decreasing with the increase of the depth.The vertical dynamic displacement at the subgrade surface presents significant concave distribution characteristics along the transverse direction.The peak dynamic displacement caused by the one-way operation of a fully-loaded train can be 5.36 times of that induced by an empty train.The effect of train axle load on the subgrade velocity response is relatively small.The peak acceleration at the subgrade surface increases about 10%when the train axle load increases from 25 t to 30 t.The dynamic response of the subgrade subjected to the train operation on the double-track railway is greater than that under one-way train operation.The peak acceleration,velocity and dynamic displacement below the downline rail caused by a fully-loaded train running on the upline are greater than those caused by an empty train running on the downline.

关 键 词：双线重载铁路 路基 有限元分析 动力响应 

分 类 号：U213[交通运输工程—道路与铁道工程]