基于起重气垫技术的运营高铁无砟轨道抬升纠偏技术研究OA

Under the long-term dynamic load of trains and complex service environments,some ballastless track subgrades had experienced uneven settlement and lateral displacement beyond the adjustment range of the fastener system,significantly compromising train operational safety.Building upon current repair methods,we designed a synchronized lifting system with air cushions and jacks to precisely control multiple displacement points,offering a new solution for fixing uneven subgrade settlement and misalignment.A finite element model of the track-subgrade system was developed to analyze the effects of single lift height,lift point spacing,and single push displacement on track stress and deformation.Key construction control parameters for subgrade lifting/re-alignment and a reaction structure design scheme were derived.The applicability of the proposed scheme was validated via an actual engineering project.Results show that under safe track structural conditions,the maximum single lift height should be controlled at 5 mm,the optimal spacing for air cushions and reaction structures is 3.25 m,and the maximum single push displacement should be limited to 2 mm.Engineering practice confirms that the re-alignment accuracy can be controlled within±1 mm,demonstrating the feasibility of this novel technology for addressing settlement and displacement in operational high-speed railway ballastless track subgrades.