公路下穿施工对高速铁路桥梁墩台及行车安全影响研究  

Research on the Impact of Road Undercrossing Construction on the Pier Foundations and Operational Safety of High-speed Railway Bridges

作　　者：叶丹 YE Dan(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055

出　　处：《高速铁路技术》2024年第3期13-18,共6页High Speed Railway Technology

摘　　要：以怀安县高速铁路车站西路下穿张呼高速铁路怀安站特大桥为例,采用现场监测和数值模拟研究公路下穿施工对怀安站特大桥邻近墩台及行车安全的影响。首先,利用现场监控得到下穿墩台在不同施工阶段的沉降值和横、纵向水平位移值;随后,通过Midas GTS建立数值模型分析墩台的动力响应规律;采用ANSYS/LS-DYNA软件建立列车-轨道动力学耦合模型,评价怀安特大桥列车在公路下穿施工过程中的行车安全性。研究结果表明:在车站西路下穿施工过程中,怀安站特大桥桥墩沉降和位移条件均在规范限值内;为确保列车运行的绝对安全与平稳,建议怀安特大桥高速铁路列车限速200 km/h通过施工区段。Taking the example of Huai’an County High-speed Railway Station West Road undercrossing the Huai’an Station Super Major Bridge of the Zhangjiakou-Hohhot High-speed Railway,this study investigates the impact of the construction on the adjacent piers of the Huai’an Station Super Major Bridge.Firstly,on-site monitoring was employed to obtain the settlement values and lateral and longitudinal horizontal displacement values of the underpass pier at various construction stages.Subsequently,a numerical simulation model was established using Midas GTS to further analyze the dynamic response behavior of the pier.Finally,a coupled train-track dynamics model was developed in ANSYS/LS-DYNA to evaluate the train operational safety during the road construction.The research findings indicate that during the road construction,the settlement and displacement of the piers of the Huai’an Station Super Major Bridge remain within the specified limits.It is recommended,for the absolute safety and smooth operation of trains,to appropriately limit the speed of high-speed trains to 200 km/h when traversing the construction section of the Huai’an Station Super Major Bridge.

关 键 词：公路施工 铁路桥梁 现场监测 桥墩沉降 数值仿真 

分 类 号：U455.55[建筑科学—桥梁与隧道工程]