摘要
受周边环境变化及人类工程活动等多种因素影响,部分高铁桥梁地段出现了较大的横向偏移。为获得运营高铁箱梁顶升平移纠偏施工中的关键控制参数,通过建立轨-梁-墩实体数值模型,分析不同工况下轨道结构的应力变化规律,提出单次最大顶升及平移量;同时选取施工期间最不利工况,检算不同偏移量下轨道结构的稳定性。研究表明:随着顶升高度和平移量增加,轨道结构应力逐渐增大,为尽量减小纠偏施工对轨道结构的影响,建议最大顶升高度和单次最大平移量为10 mm,单个“天窗点”累计平移量控制在20 mm以内;箱梁和桥墩应力以及支座反力随支座支撑状态和偏移量的增大逐渐增加,以箱梁拉应力和支座反力作为控制条件,在不降速运行情况下,为保证轨道结构的稳定性,可实施的最大纠偏量为80 mm。本研究成果可为运营高铁箱梁顶升平移纠偏施工提供关键控制参数及理论依据。
Affected by many factors such as surrounding environment changes and human engineering activities,some high-speed railway bridge sections experience large lateral deviation.In order to obtain the key construction control parameters of box beam jacking-up and translation rectification in operating high speed railway,the stress variation law of track structure under different working conditions is analyzed and the maximum single jacking and translation amounts are proposed based on the solid numerical model of rail-beam-pier.Meanwhile,the most unfavorable working condition is selected and the stability of track structure under different offsets is checked.The research results show that the stress of track structure increases gradually with the increase of jacking height and translation amount;in order to minimize the influence of deviation correction construction on track structure,it is recommended that the maximum jacking height and the single maximum translation amount should be 10 mm,and the cumulative translation amount of single“skylight period”should be controlled within 20 mm;the stress of box beam and bridge pier and the reaction force of support increase gradually with the support state and the increase of the translation amount;taking the tensile stress of box beam and the reaction force of support as the control condition,the maximum implementable deviation correction amount is 80 mm without speed reduction so as to ensure the stability of track structure.The research results can provide key control parameters and theoretical basis of box beam jacking and translation deviation correction of operating high speed railway.
作者
朱江江
俞添
陈占
ZHU Jiangjiang;YU Tian;CHEN Zhan(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)
出处
《铁道标准设计》
北大核心
2023年第3期115-121,共7页
Railway Standard Design
基金
中国铁建股份有限公司科研计划课题(17-C39)。
关键词
运营高铁
箱梁顶升平移
数值模拟
关键控制参数
稳定性分析
operating high-speed railway
box beam jacking-up and translation
numerical simulation
key control parameters
stability analysis
作者简介
朱江江(1989-),男,高级工程师,2019年毕业于西南交通大学道路与铁道工程专业,工学博士,主要从事岩土工程勘察设计、工程运维修复技术研究工作,E-mail:zjjblue28@163.com;通信作者:俞添(1971-),男,正高级工程师,2015年毕业于华中科技大学铁道运输工程专业,工学硕士,主要从事岩土勘察设计、工程运维修复技术研究工作,E-mail:tsyytgs@vip.163.com。
