温度梯度荷载对CRTSⅡ型板式轨道层间损伤影响

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摘要 研究目的:为探明温度梯度荷载对砂浆层和轨道板层间连接的影响,建立包含层间内聚力模型的CRTSⅡ型板式轨道有限元模型,分析正、负温度梯度荷载对层间离缝产生、发展及对轨道结构变形的影响,对比两种温度梯度荷载的影响差别。
研究结论:(1)CRTSⅡ型板式轨道层间连接损伤区域和轨道结构变形均随温度梯度荷载的增加而增大,相同数值负温度梯度荷载引起的损伤更为严重;(2)当温度梯度荷载为-10 ~20 ℃/m时,其对层间损伤的影响甚微;(3)相同正温度梯度荷载作用下轨道板较砂浆层变形量更大,正温度梯度荷载作用下沿板边方向的轨道变形量较沿板中方向的大,而负温度梯度荷载作用下两者差别不大;(4)本研究成果可为高速铁路CRTS Ⅱ型板式轨道长期服役性能分析及其养修提供理论参考。

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	高建敏
	金忠凯
	赖思成

关键词 ： CRTS Ⅱ型板式轨道, 有限元分析, 温度梯度荷载, 离缝损伤, 损伤扩展

Abstract：Research purposes:To investigate the influence of temperature gradient loads on the connection between mortar layer and track slab, a finite element model including a cohesion model between layers of CRTS Ⅱ slab ballastless track was established. The influence of positive and negative temperature gradient loads on the initiation and development of mortar layer gap and the effect of them on track deformations were analyzed. The difference between the two kinds of temperature gradient loads on interlayer damage was compared.
Research conclusions:(1) The damage area and deformations of CRTS Ⅱ slab ballastless track increase with the increase of temperature gradient loads. The interlaminar damage caused by negative temperature gradient loads are more serious than that caused by positive ones. (2) When the temperature gradient load is in the range of -10 ~20 ℃/m, it has little effect on the interlaminar damage. (3) Under the same temperature gradient loads, the deformation of track slab is greater than that of mortar layer. Under the positive temperature gradient load, the track structure deformation along the slab edge is greater than that along the slab middle. However, under the negative temperature gradient load, the difference is not significant. (4) The research results can provide theoretical reference for the long-term service performance analysis and maintenance of CRTS Ⅱ slab track of high-speed railways.

Key words： CRTS Ⅱ slab track finite element analysis temperature gradient load gap damage damage propagation

收稿日期: 2021-02-07

PACS:

U213.2

基金资助:国家自然科学基金项目(51678507,11790280);牵引动力国家重点实验室自主研究课题(2019TPL-T10)

作者简介: **高建敏,1981年出生,女,副研究员。

引用本文:

高建敏, 金忠凯, 赖思成. 温度梯度荷载对CRTSⅡ型板式轨道层间损伤影响[J]. 铁道工程学报, 2022, 39(1): 25-32.
GAO Jianmin, JIN Zhongkai, LAI Sicheng. Effect of Temperature Gradient Load on Interlayer Damage of CRTS Ⅱ Slab Track. Journal of Railway Engineering Society, 2022, 39(1): 25-32.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I1/25

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