Abstract
With the gradual increase of the cargo weight of heavy-haul trains, the traditional ballasted track with the accumulation of stone and ballast has been unable to meet its structural safety requirements. From the comparison of the three common ballastless tracks in China, it can be seen that the low-vibration track (LVT) has the advantages of reasonable structure, low cost, and easy maintenance. Therefore, the design and research of heavy-haul railways are focused on, and it is urgent to study the applicability of LVT in heavy-haul railways. Method: By improving the slope of the short side of the LVT support block, the support block has a better load bearing capacity, so as to achieve the purpose of bearing a larger axle load. Through 1:1 full-scale model test and finite element simulation, the static mechanical properties of Improved LVT (ILVT) and Traditional LVT (TLVT) are compared and analyzed. Result: Compared with TLVT, ILVT has smaller vertical displacement and track gauge changes when subjected to the same load. The proven and reliable finite element model also shows that ILVT’s load sharing is less affected. In the case of achieving the same deformation, ILVT can withstand greater vertical and lateral loads. Conclusions: Compared with the TLVT, the ILVT design can reduce the vertical displacement of the rail and the supporting block, better control the track subsidence, and improve the driving safety of the LVT. At the same time, ILVT improves the anti-overturning ability of the rail and support block under lateral load, reduces the expansion of the gauge and the lateral spacing of the support block, and improves the stability of the track structure. ILVT can also be considered for the weight of 40t and other large axle load, and has broad application prospects.
Highlights
When Improved LVT (ILVT) is subjected to the same load, the ILVT design can reduce the vertical displacement of the rail and the supporting block, better control the sinking amount of the track, and improve the driving safety of low-vibration track (LVT)
It can be seen from the data comparison and analysis that the design of ILVT can reduce the expansion of the gauge and the lateral spacing of the supporting block, and improve the anti-turning ability of the rail and the supporting block under the lateral load to a certain extent, and improve the stability of the track structure
Compared with Traditional LVT (TLVT), the design of ILVT can reduce the vertical displacement of the rail and support block, better control the amount of track sinking, and improve the driving safety of LVT
Summary
The axle load of heavy-haul railway trains is generally greater than 27t [1]. With the continuous development of social and economic needs, the axle load of heavy-haul trains has become larger and larger (Figure 1) [2], and the previous ballasted track structures built with stone ballast have gradually become difficult to meet their stress requirements. Ballasted tracks are often damaged during the operation of heavy-haul trains, leading to frequent repairs by workers, increasing maintenance costs, and affecting train operation [3,4,5].
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