Thermal insulation performance and dynamic response of anti-freeze subgrade of high-speed railway in seasonally frozen regions
TRANSPORTATION GEOTECHNICS(2023)
摘要
In order to counteract the adverse effects of seasonally frozen regions, measures need to be taken to insulate highspeed railway subgrades and implement anti-freeze structures. The present study delves into this topic by analyzing the thermal-mechanical behaviors of railway subgrade through on-site measured data. Then, using the hydrodynamic theory, a model of frozen soil with Multi-physical field coupling is built, on which the temperature field and frost heave development of six different subgrade structures are explored, and produces a vehicle-tracksubgrade coupling dynamic model that is used to calculate the dynamic performance of vehicles and the dynamic response transfer between subgrade layers under the influence of different anti-freeze subgrade structures. The results show that the subgrade structure built using concrete insulation (asphalt concrete (AC) or cellular concrete (CC)) + cement stabilized crushed stone (CSCS) + polyurethane (PU) panel mitigates the impact of external air temperatures and internal cooling, helping to reduce the maximum frost heave while simultaneously achieving improved thermal insulation. Further, these anti-freeze subgrade structures also bolster the safety and stability of high-speed railway vehicle operations. Therefore, it is suggested that the "concrete insulation layer + CSCS layer + PU panel" structures be utilized as a reference during the design of subgrade structures in seasonally frozen regions.
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关键词
thermal insulation performance,frozen regions,anti-freeze,high-speed
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