城际铁路明挖隧道下穿既有高铁施工控制技术及标准探讨

明挖隧道近接既有高铁桥梁施工时对桥梁结构及运营安全将产生一定影响,基于珠三角新塘经白云机场至广州北站城际铁路区间隧道下穿武广高铁花都特大桥这一实际工程,探讨隧道下穿高铁工程的控制标准及施工控制措施,利用有限元软件分析基坑开挖对既有桥梁变形和位移的影响,并结合轨道变形及车辆系统动力响应分析,研究施工期间高速铁路限速运行措施。现场监控量测数据表明,各项监测数据均在控制限值内,采取的变形控制措施有效。

Discussion on Construction Control Technology and Standard of Intercity-railway Undercrossing Existing High-speed Railway by Open-cut Tunnel

The construction of the open-cut tunnel near the existing high-speed railway line can affect the safety and normal operation of the structure. The tunnel of Guangdong Pearl River Delta Intercity Railway(Xintang-Baiyun Airport-Guangzhou North Railway Station Project) crosses through the existing Huadu Extra-long Bridge on Wuhan-Guangzhou High-speed Railway. Based on the practical engineering, this paper discusses the control standards and control measures for the tunnel construction crossing through high-speed railway, and the influence of the excavation of the foundation pit on the deformation and displacement of the existing bridge is analyzed by finite element numerical simulation software. The combination analysis of the track deformation and the dynamic response of vehicle system is employed to study the speed-limits of Wuhan-Guangzhou passenger dedicated line during construction. The field monitoring measurement results show that all the deformations and displacements are within limits, and the deformation control measures adopted are effective.