Abstract
Uneven settlement of high-speed railway subgrade leads to the irregularity of high-speed railway line, which seriously affects high-speed train operation. The skylight point of high-speed railway operation is short and the maintenance time is limited. Therefore, how to quickly lift and repair the ballastless track slab in the subsidence section is an urgent problem to be solved in the maintenance of high-speed railways. The two-component non-aqueous reactive polymer material has the advantages of strong expansive force, fast reaction speed, and wide application range, which is extremely suitable for the repair of high-speed railway track slab subsidence and lifting. In this study, the expansion force characteristics of different density polymer materials and the stress-deformation curves at corresponding density are tested in laboratory to propose the mechanical parameters of polymer. Then, a three-dimensional finite element (FE) model of high-speed railway train ballastless-track subgrade is established based on ABAQUS. The mechanical characteristics of CRTS III ballastless track under different repair materials, different elevation, and different density of polymer grouting materials are analyzed. The results show that, under the dynamic load of the train, the stress value of polymer repairing material is less than that of cement slurry, presenting a compressive stress state, which is similar to that of the complete subgrade surface. In addition, within a certain thickness range, increasing the thickness of polymer is beneficial to reducing the difference of stress variation between polymer filling layer and complete pavement. Once beyond this range, the thickness of polymer has little effect on the force variation.
Highlights
Uneven settlement of high-speed railway subgrade leads to the irregularity of high-speed railway line, which seriously affects high-speed train operation
The density of polymer specimens in the test vessel is determined by the grouting quantity, specimens with different densities increases with time, and the relationship between the maximum different grouting quantity obtains a different maximum expansion force
Expansion force of expansive force and the increases density ofwith different is obtained. between the maximum expansive with different densities time,materials and the relationship specimens with different densities increases with time, and the relationship between the maximum force and the density of different materials is obtained
Summary
Uneven settlement of high-speed railway subgrade leads to the irregularity of high-speed railway line, which seriously affects high-speed train operation. Within a certain thickness range, increasing the thickness of polymer is beneficial to reducing the difference of stress variation between polymer filling layer and complete pavement. Under the action of multiple factors, e.g., environment, improper construction and repeated load of high-speed train, the subgrade of unballasted track will appear uneven settlement and other disasters to a large extent. It causes stress concentration and cracks in high rigidity track slab, which leads to the decline of long-term service performance of track slab, and affects the comfort and safety of train operation [2]. The uneven settlement of subgrade leads to the irregularity of the upper track structure, leading to the stability and safety of high-speed train operation
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