依托排渠下穿既有城际铁路顶管排障工程,针对顶管顶进受阻、施工难度大、安全隐患大、工期紧的难点,通过技术方案比选、三维有限元数值模拟分析和现场监测结果的验证,研究了地层冻结法加固结合矿山法暗挖施工对上方既有城际铁路结构安全性能的影响,探讨了该方案用于顶管排障工程的有效性。结果表明:该方案有效控制了施工期间既有城际铁路的位移变形和内力变化,保障了结构安全。研究成果可为类似工程的设计与施工提供参考。

This article focuses on the engineering involved in removing obstacles during the pipe jacking of a drainage canal beneath an existing intercity railway. In response to the difficulties of blocked pipe jacking, high construction difficulty, major safety hazards, and tight construction schedule, the impact of artificial ground freezing reinforcement combin with undermining method on the safety performance of the intercity railway structure above is studied, through technical scheme comparison and selection, 3D finite element numerical simulation analysis, and in-situ monitoring results verification. The effectiveness of this scheme for top pipe obstacle removal engineering is explored. This project effectively manages displacement deformation and internal force changes in the existing intercity railway during construction, ensuring structural safety. It also provides valuable theoretical support and practical guidance for the design and construction of similar projects.