不间断运行条件下高速铁路沉降病害综合整治关键技术

Key Technologies for Comprehensive Treatment of Settlement Diseases of High-Speed Railway Under Uninterrupted Operation

以京西某新建运营高速铁路路基沉降无砟轨道整体抬升综合整治为例,采用“注胶抬升+注浆加固+疏通排水孔”的总体技术方案,取得较好效果。在“水”的作用下导致无砟轨道沉降变形,路桥过渡段尤其严重。“疏、排、控、截”是处理该类水害的主要手段,配合使用注浆加固,提高排水后路基填筑体的强度,大幅有效改善其工程性能。采用AB聚氨酯发泡型注胶整体抬升方法处理,效果明显,施工简单,可用于应急性抢修复工程。但作为服役时间长,工况复杂,且变形要求严格的高速铁路,其耐久性等重要工程性能指标有待进一步研究。

Taking the comprehensive improvement of ballastless track for subgrade settlement of a newly-built high-speed railway in western Beijing as an example, the overall technical scheme of “glue injection lifting+grouting reinforcement+dredging drainage holes” has been adopted, and good results are achieved. Under the action of “water”, the settlement and deformation of the ballastless track are caused, especially in the transition section between the road and the bridge. “Dredging, drainage, control and interception” is the main means to deal with this kind of water damage. Combined with grouting reinforcement, it can improve the strength of subgrade filling body after drainage and greatly and effectively improve its engineering performance. AB polyurethane foam type glue injection integral lifting method is adopted for treatment, which has obvious effect and simple construction, and can be used for emergency rescue and repair projects. However, as a high-speed railway with long service time, complex working conditions and strict deformation requirements, its durability and other important engineering performance indicators need to be further studied.