CRTSⅡ型板式无砟轨道疏控技术方案研究

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Abstract Research purposes: To alleviate the expansion of CRTS Ⅱ track slab under high temperature and reduce the expansion-oriented temperature force caused by the restricted deformation of track slab fundamentally, it is necessary to study the stress-relief technology of CRTS Ⅱ track slab in depth. With the analysis of the track-slab structural characteristics in the application scenario of bridge and subgrade, together with the design experience of track slabs in the turnout area, the scheme of continuous track-slab unitization and weak longitudinal connection is proposed. After that, the key parameters are obtained by the analytical method and finite element simulation. Based on the established finite element model, the control scheme after unitization is studied, and the evaluation method together with the allowing superior limit of camber is put forward.
Research conclusions: (1) The stress characteristics of CRTS Ⅱ track slab in subgrade and bridge section are basically the same under high temperature. The critical wavelength of the camber under damage state is determined as 19 m by the analytical method, and the scheme of three-slab unitization is preferred for unlocking. (2) The influence of partial/full filling in wide-narrow joints on the elastic modulus of low-elastic-modulus high-toughness materials is analyzed. It is concluded that the full filling scheme is more favorable to the value-range selection of filling-material elastic modulus. (3) When the track slab is unitized, the uniform planting of reinforcement is more conducive to limit the movement of track plate under high temperature. (4) The method of identifying track camber on the basis of the height variation of rail surface and the height difference variation of rail bottom slab is proposed. It is found the sections where the height variation of rail surface is greater than 2 mm in high-temperature season should be paid more attention.(5) The research result can provide technical support for camber regulation of continuous slab track.

Key words： slab track camber unitization weak longitudinal connection planting reinforcement evaluation

Received: 18 May 2022

PACS:

U213.9

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	Articles by authors
	WANG Huiyong
	LIANG Yanke
	XU Lingyan
	KOU Shengyu
	XU Peng

Cite this article:

WANG Huiyong,LIANG Yanke,XU Lingyan, et al. Research on the Release and Control Technology Scheme of CRTS Ⅱ Track Slab[J]. Journal of Railway Engineering Society, 2022, 39(8): 40-45.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I8/40

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