某高速铁路隧道无砟轨道异常段仰拱整治技术

Improvement of Inverted Arch in Abnormal Section of Ballastless Track in High-speed Railway Tunnel

结合西部山区某高速铁路典型黄土隧道内无砟轨道异常上拱病害情况,探讨“钻孔桩+纵梁”的加固补强措施的工程可行性及工程效果.工程实践及监测结果表明:“钻孔桩+纵梁”的加固补强措施是有效可行的,工程措施的实施改善了隧底围岩及仰拱的受力状态,确保了轨道基础的稳定性,为高速铁路安全、平稳、舒适运营提供了基础保障,可为同类工程补强施工及轨道养护维修积累经验.

Combining with the abnormal arch disease of ballastless track in typical loess tunnel of high-speed railway in western mountainous area,the engineering feasibility and engineering effect of strengthening measures of"bored pile+longitudinal beam"are discussed.Engineering practice and monitoring results show that the reinforcement measures of"bored pile+longitudinal beam"are effective and feasible.The implementation of engineering measures improves the stress state of surrounding rock and inverted arch at tunnel bottom,ensures the stability of track foundation,provides basic guarantee for safe,stable and comfortable operation of high-speed railway,and accumulates experience for reinforcement construction and track maintenance of similar projects.