Cutting subgrade bed structure of high-speed railway with ballastless track in seasonally frozen regions

Abstract

The invention relates to a cutting bed structure of a ballast-less rail type high-speed railway in a seasonal frozen-earth area, so as to effectively control the water content of filled earth within the bed range not to exceed the initial frost heaving water content to prevent frost heaving deformation from the source, so that the cutting bed structure satisfies the control requirement of the ballast-less rail type high-speed railway on the bed structure deformation, and the high smoothness, stability and durability of a rail structure are guaranteed. A cutting bed comprises a composite waterproof drainage layer, a lower bed bottom layer, a drainage type upper bed bottom layer, a drainage type bed surface layer and a bed surface waterproof layer, wherein the composite waterproof drainage layer, the lower bed bottom layer, the drainage type upper bed bottom layer, the drainage type bed surface layer and the bed surface waterproof layer are laid or filled on an original foundation earth layer on the bottom surface of a bed replacing layer in sequence from bottom to top; drainage constructions are formed on both sides of the cutting bed, and the level of the drainage surface of a drainage structure on the lower part of each drainage construction is lower than that of the lower bottom surface of the composite waterproof drainage layer; and the designed frozen depth of the cutting bed begins from the upper surface of the bed surface waterproof layer to the upper surface of the lower bed bottom layer.

Description

technical field [0001] The invention relates to a high-speed railway ballastless track, in particular to a cutting foundation bed structure for a ballastless track high-speed railway in a seasonally frozen region. Background technique [0002] Ballastless track is a track structure that replaces loose ballast materials with high-strength and high-rigidity concrete materials. Its ability to maintain geometric state and stability is enhanced, and the maintenance workload is reduced. It is widely used in high-speed railways at home and abroad. broadly used. However, the biggest shortcoming of the ballastless track structure lies in its poor ability to adapt to the uneven deformation of the offline foundation. Once the structure is damaged, it will not only affect the comfort and safety of driving, but also make maintenance more difficult. Therefore, the strength of the offline foundation , rigidity, plastic deformation, and uniformity in vertical and horizontal directions put ...

AI Technical Summary

Problems solved by technology

However, for the almost stringent millimeter-scale deformation control requirements of ballastless track high-speed railways, how to control the frost heave deformation within a reasonable range has exceeded the existing technical understanding of geotechnical engineering frost heave problems, and there is no direct solution lessons learned

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