假缝对Ⅱ型轨道板上拱稳定性影响研究

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摘要 研究目的: Ⅱ型轨道板上拱是该型轨道结构在使用过程中存在的主要问题,目前轨道板上拱的形成机理尚未完全明确。为研究不同工作状态的假缝对轨道板上拱稳定性的影响性质,本文基于结构稳定性理论,建立可全面表征假缝形状及伤损形式的Ⅱ型轨道板上拱稳定性三维数值模型,并在充分考虑Ⅱ型轨道板的细部及整体的结构特征的基础上,拟定与不同研究内容分别对应的各种计算方案及工况;采用本文建立的数值模型计算上述各种方案与工况下的轨道板竖向位移,通过将计算的轨道板竖向位移与轨道板上拱允许矢度进行比较,分析正常及伤损状态下的假缝对轨道板上拱稳定性的影响性质、可提高轨道板上拱稳定性的新的假缝方案。
研究结论: (1)假缝对轨道板保持上拱稳定性是有利的;(2)假缝对轨道板上拱变形线形影响很小;(3)在原假缝深度及开口宽度不变的情况下,仅将假缝的“V”型截面变为矩形截面,轨道板的上拱矢度减小约11%;(4)假缝处的伤损对轨道板保持上拱稳定性是有利的;(5)本研究成果可为进一步明确轨道板上拱的形成机理、合理制定无砟轨道养护维修方法提供参考和借鉴。

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	杨俊斌
	刘学毅
	杨荣山

关键词 ： Ⅱ型轨道板, 上拱稳定性, 假缝, 伤损状态, 数值模型

Abstract：Research purposes: The upper arch of the type Ⅱ track slab is the main problem in the use of this type of track structure. At present, the formation mechanism of the upper arch on the track slab is not completely clear.In order to study the nature of the influence of the V-shaped groove in different working conditions on the upper arch stability of the track slab,based on the theory of structural stability, this paper establishes a three-dimensional numerical model of the upper arch stability of type Ⅱ track slabs that can fully characterize the shape and damage form of the V-shaped groove,and on the basis of fully considering the detailed and overall structural characteristics of type Ⅱ track slab, various calculation schemes and working conditions corresponding to different research contents have been drawn up; The numerical model established in this paper is used to calculate the vertical displacement of the track slab under the above various schemes and working conditions,by comparing the calculated vertical displacement of the track slab with the allowable vector of the upper arch on the track slab,the influence of the V-shaped groove under normal and damaged conditions on the stability of the track slab arch is analyzed, and a new groove scheme to improve the stability of upper arch on track slab is determined.
Research conclusions: (1) V-shaped groove are beneficial to maintaining the stability of the upper arch of the track slab. (2) V-shaped groove has little effect on the line shape of the upper arch deformation of the track slab. (3)Under the condition that the depth and opening width of the original V-shaped groove remain unchanged, when the "V" section is changed into a rectangular section,the upper arch of the track slab is reduced by about 11%.(4)The damage at the V-shaped groove is beneficial to the stability of the track slab. (5)The research results of this paper can provide a reference for further clarifying the formation mechanism of the upper arch on the track slab and reasonably formulating the maintenance method of ballastless track.

Key words： type Ⅱ track slab stability of upper arch V-shaped groove damage state numerical model

收稿日期: 2021-06-30

PACS:

U213.7

基金资助:中央高校基本科研业务费(2682019CX01);国家自然科学基金面上项目(51778543)

作者简介: **杨俊斌,1979年出生,男,讲师。

引用本文:

杨俊斌, 刘学毅, 杨荣山. 假缝对Ⅱ型轨道板上拱稳定性影响研究[J]. 铁道工程学报, 2022, 39(5): 26-32.
YANG Junbin, LIU Xueyi, YANG Rongshan. Research on the Influence of V-shaped Groove on the Upper Arch Stability of Type Ⅱ Track Slab. Journal of Railway Engineering Society, 2022, 39(5): 26-32.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I5/26

[1]	杨俊斌,张光明,杨荣山,等.基于不等波长模型的Ⅱ型轨道板上拱稳定性公式[J].中南大学学报:自然科学版, 2020(12):3566-3574.Yang Junbin, Zhang Guangmin,Yang Ronshan,etc. Formula for Stability of the Upper Arch of CRTS-Ⅱ Track Slab Based on Models of Unequal Wavelength[J]. Journal of Central South University:Science and Technology, 2020(12):3566-3574.
[2]	杨俊斌,曾毅,刘学毅,等. 基于能量准则的Ⅱ型板式轨道稳定性[J]. 中南大学学报:自然科学版, 2015(12): 4707-4712.Yang Junbin, Zeng Yi, Liu Xueyi,etc. Stability of CRTS-Ⅱ Slab Track Based on Energy Norm[J]. Journal of Central South University:Science and Technology, 2015(12):4707-4712.
[3]	张向民,赵磊. 高速铁路CRTSⅡ型板式无砟轨道稳定性理论研究[J]. 铁道工程学报, 2018(1):49-55.Zhang Xiangmin, Zhao Lei. Research on the Stability Theory of CRTSⅡSlab Ballastless Track on High －speed Railway[J]. Journal of Railway Engineering Society, 2018(1):49-55.
[4]	李靖华,车惠民.切口混凝土梁断裂能的尺寸效应试验研究[J]. 西南交通大学学报,1992(3):9-14.Li Jinghua,Che Huimin. Experimental Study on Size Effect of Fracture Energy of Notched Concrete Beams[J]. Journal of Southwest Jiaotong University,1992(3):9-14.
[5]	冯琛. 混凝土材料V型切口尖端应力-应变场分析[D]. 哈尔滨:哈尔滨工程大学, 2008.Feng Chen.Stress and Strain Analysis at the Tip Field of a V-Notched in Concrete Material[D].Harbin:Harbin Engineering University, 2008.
[6]	张云国,李梦楠,薛向锋.切缝深度对聚丙烯纤维自密实轻骨料混凝土弯曲韧性的影响[J]. 硅酸盐通报,2016(10):3235-3241.Zhang Yunguo,Li Mengnan,Xue Xiangfeng.Influence of Cutting Depth on Flexural Toughness of Polypropylene Fiber Reinforced Self-compacting Lightweight Aggregate Concrete[J]. Bulletin of the Chinese Ceramic Society,2016(10):3235-3241.
[7]	赵震波,李晨,潘俊杰.局部削弱对压杆稳定性影响的研究[J]. 机械科学与技术, 2012(4):592-596.Zhao Zhenbo,Li Chen,Pan Junjie. Buckling Analysis of the Locally Weakened Column[J]. Mechanical Science and Technology for Aerospace Engineering,2012(4):592-596.
[8]	张晓君, 吴国荣. 含裂纹细长压杆临界力分析[J]. 上海海事大学学报, 2007(2):30-36.Zhang Xiaojun, Wu Guorong. Critical Press Analysis on Cracked Slender Columns[J]. Journal of Shanghai Maritime University, 2007(2):30-36.
[9]	广钟岩,高惠安. 铁路无缝线路[M].北京:中国铁道出版社,2005:108-132.Guang Zhongyan,Gao Huian.Jointless Rail[M].Beijing: China Railway Publishing House,2005:108-132.