城市地铁盾构隧道下穿运营铁路施工控制技术研究

Construction Control Technology for an Urban Subway Shield Tunnel underneath an Operational Railway

城市轨道交通的大规模兴建,不可避免地导致了各类近接工程的出现,给实际施工带来了极大挑战。文章依托长沙地铁1号线涂家冲站—铁道学院站区间隧道下穿京广铁路工程,对盾构下穿既有运营铁路的施工控制深入开展了研究,提出了包括旋喷桩加固、线路架空加固(横挑纵抬)等针对性的施工控制方案,并进行了数值模拟计算分析。结果表明,在上述控制措施的保护下,既有运营铁路路基与铁轨的变形值均能够满足铁路安全运营的要求,所提出的控制措施是有效可靠的,可供类似工程参考。

With the large-scale construction of urban rail transit, it＇s very common to approach various types of construction works, which poses great construction challenges. A study on the construction control of shield tunneling beneath an existing railway is conducted based on the running tunnel from Tujiachong station to Tiedaoxueyuan sta- tion of Changsha Metro Line I. Construction control programs such as rotary pile reinforcement and overhead line re- inforcement （longitudinal lifting of the existing railroad using cantilevers of I-beams） are proposed, and a numerical simulation is carried out. The results indicate that the deformations of the subgrade and existing railroads can meet the requirements of railway operation safety when the above construction control measures are used and that the pro- posed control measures are effective and reliable.