刘维正,冉文杰,郜凤龙,谭际鸣,徐磊,黄轩嘉

• 1:中南大学土木工程学院
• 2:高速铁路建造技术国家工程研究中心

摘要(Abstract)：

路基动力响应直接影响轨道平顺性和列车运行安全。为研究南方湿热地区季节性变化与提速运营下高铁无砟轨道-路基动力响应演变规律，依托运营期武广高铁某桥头路基过渡段工点开展无砟轨道-路基动力响应现场监测试验，分析温湿度季节性变化下的路基沉降规律，对比提速前后轨道-路基振动加速度和动相对位移时域特征，探究车速、降雨和季节变化对轨道-路基动力响应频域特性的影响。结果表明，在列车动载和季节性变化共同影响下，路基沉降量为-1.47～2.93 mm,不均匀沉降幅值达0.41～0.63 mm;道床板、底座板和路基振动加速度与层间动相对位移均与路基沉降量呈正相关，车速由300 km/h提至350 km/h后，振动加速度幅值分别增加31.2%、28.2%、33.1%,道床板-底座板与底座板-路基动相对位移分别增加26.19%、31.34%;列车提速导致道床板、底座板和路基的主频段能量密度峰值分别增大47.6%、80.7%、13.9%,试验段路基主频受降雨与温度共同作用影响显著，低温少雨条件下主频增大，而在高温多雨条件下主频降低。研究成果可为湿热多雨地区高铁路基服役性能评价和列车提速运营提供参考。

关键词(KeyWords)： 轨道路基;现场监测;动力响应;不均匀沉降;频域特性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52578541);; 中国国家铁路集团有限公司科技研究开发计划(L2023G002);; 湖南省自然科学基金(2024JJ5429);; 中国中铁股份有限公司科技研究开发计划(2021-专项-08)

作者(Author): 刘维正,冉文杰,郜凤龙,谭际鸣,徐磊,黄轩嘉

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