Consideration of the effects of frost heave force and train loads on the cracks and propagation pattern of ballastless track slabs in cold regions

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2024-05-26 DOI:10.1016/j.coldregions.2024.104233

Wei Chen , Yushuo Zhang , Tianqi Zhang , Weidong Wang , Ping Lou , Zili Pan

{"title":"Consideration of the effects of frost heave force and train loads on the cracks and propagation pattern of ballastless track slabs in cold regions","authors":"Wei Chen , Yushuo Zhang , Tianqi Zhang , Weidong Wang , Ping Lou , Zili Pan","doi":"10.1016/j.coldregions.2024.104233","DOIUrl":null,"url":null,"abstract":"<div><p>The construction of ballastless railway tracks in cold regions is susceptible to frost heave forces, which may particularly impact the stability of track slab cracks and lead to crack propagation. In this paper, the frost heave tests are conducted on the concrete specimens with prefabricated cracks to observe the evolution of the frost heave force within the cracks. The frost heave force is subsequently applied to the finite element model of the concrete specimens to calculate the stress intensity factors (SIFs). In addition, the CRTS III ballastless track model is established to investigate the crack propagation patterns under frost heave and train loads. The results show that the frost heave force in concrete cracks during freezing and thawing is divided into five stages, which produces two peaks of frost heave force. Train loading caused the SIFs of the crack tips to open and close alternately and to rise significantly under the coupling effect of frost heave load. The SIF increases approximately linearly with crack width and is higher for transverse cracks than for longitudinal cracks. Small size cracks do not possess sufficient SIF values to exceed fracture toughness, implying no crack propagation. However, as the crack width is constantly increasing, the SIF will eventually exceed the fracture toughness. Therefore, strict control over track slab's crack width is necessary for CRTS III ballastless tracks.</p></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"224 ","pages":"Article 104233"},"PeriodicalIF":3.8000,"publicationDate":"2024-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cold Regions Science and Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0165232X24001149","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}

引用次数: 0

Abstract

The construction of ballastless railway tracks in cold regions is susceptible to frost heave forces, which may particularly impact the stability of track slab cracks and lead to crack propagation. In this paper, the frost heave tests are conducted on the concrete specimens with prefabricated cracks to observe the evolution of the frost heave force within the cracks. The frost heave force is subsequently applied to the finite element model of the concrete specimens to calculate the stress intensity factors (SIFs). In addition, the CRTS III ballastless track model is established to investigate the crack propagation patterns under frost heave and train loads. The results show that the frost heave force in concrete cracks during freezing and thawing is divided into five stages, which produces two peaks of frost heave force. Train loading caused the SIFs of the crack tips to open and close alternately and to rise significantly under the coupling effect of frost heave load. The SIF increases approximately linearly with crack width and is higher for transverse cracks than for longitudinal cracks. Small size cracks do not possess sufficient SIF values to exceed fracture toughness, implying no crack propagation. However, as the crack width is constantly increasing, the SIF will eventually exceed the fracture toughness. Therefore, strict control over track slab's crack width is necessary for CRTS III ballastless tracks.

查看原文本刊更多论文

寒冷地区霜冻隆起力和列车荷载对无砟轨道板裂缝和扩展模式影响的考虑

在寒冷地区建造无砟轨道容易受到冻胀力的影响，特别是会影响轨道板裂缝的稳定性并导致裂缝扩展。本文对预制裂缝的混凝土试件进行了冻胀试验，以观察裂缝内冻胀力的演变情况。随后，将冻胀力应用于混凝土试件的有限元模型，以计算应力强度因子（SIF）。此外，还建立了 CRTS III 无砟轨道模型，以研究冻浪和列车荷载作用下的裂缝扩展模式。结果表明，冻融期间混凝土裂缝中的冻胀力分为五个阶段，产生两个冻胀力峰值。在冻胀荷载的耦合作用下，列车荷载导致裂缝顶端的 SIF 交替开合并显著上升。SIF 随裂缝宽度近似线性增加，横向裂缝的 SIF 要高于纵向裂缝。小尺寸裂缝的 SIF 值不足以超过断裂韧性，这意味着没有裂缝扩展。然而，随着裂缝宽度的不断增加，SIF 值最终会超过断裂韧性。因此，CRTS III 无砟轨道必须严格控制轨道板的裂缝宽度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Cold Regions Science and Technology 工程技术-地球科学综合

CiteScore

7.40

自引率

12.20%

发文量

209

审稿时长

4.9 months

期刊介绍： Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.