不同基础上CRTS Ⅱ型无砟轨道的温度效应分析

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Abstract Research purposes: Bridges, roadbeds, and transition sections are the main substructure for the high-speed railway ballastless tracks. It is important to study the influence of different substructures on the temperature distribution in the CRTS Ⅱ slab ballastless track. Based on the field temperature monitoring data within half a year, the characteristics of the temperature and temperature gradient in the track slabs on three substructures (e.g. the simply supported box girder bridge, roadbed, the transition section between roadbed and bridge) are compared and analyzed in this paper.
Research conclusions:(1) The temperature in track slab on transition section has the most remarkable feature of non-Gaussian and non-stationary in half a year, while the roadbed has the worst non-Gaussian feature. Within the four special temperature days, the variation of internal temperature in the maximum temperature day is the largest. However, the variation of temperature gradient in maximum temperature difference day has the greatest amplitude. (2) As for various types of substructure, the temperature difference and temperature gradient of the track slab on transition section have the most notably variation, followed by those temperature variation of the roadbed and the transition section. (3) The relationship among the internal temperature in track slab on different substructures, the temperature in soil body of roadbed, and the ambient temperature presents obvious nonlinear relationship, in which the quadratic polynomial fitting function is used to reflect the nonlinear relationship between the temperature in the track slab and ambient temperature. In addition, the fitting R² of the track temperature on the bridge is 0.803, which is higher than that on the transition section (0.752) and the roadbed (0.635). (4) This research could provide important temperature measuring data of the service performance evaluation for the ballastless tracks in high-speed railway.

Key words： CRTS Ⅱ slab ballastless track substructure temperature monitoring non-stationary non-Gaussian temperature correlation

Received: 17 December 2021

PACS:

U213.2

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	Articles by authors
	ZHOU Rui
	YUAN Wenhao
	ZHU Xingsheng
	LIU Hanlin
	YANG Huaizhi
	WANG Yi

Cite this article:

ZHOU Rui,YUAN Wenhao,ZHU Xingsheng, et al. Temperature Effect Analysis of CRTS Ⅱ Ballastless Track with Different Substructures[J]. Journal of Railway Engineering Society, 2023, 40(1): 13-20.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I1/13

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