Effect of Tunnel Floor Heave on the Deformation and Damage Behavior of Ballastless Track Structures in High-Speed Railways

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL
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Abstract

The extensive development of high-speed railways in mountainous areas has underscored the significant challenge posed by tunnel floor heave, affecting the operational reliability of ballastless tracks. Such heave induces track deformation and structural impairments, critically undermining the operational safety and track serviceability. This investigation enhances the understanding of ballastless tracks’ mechanical responses to tunnel floor heave by introducing a sophisticated nonlinear analytical model that encapsulates the interplay between the track system, tunnel infrastructure, and the encasing geological environment. Utilizing the concrete damaged plasticity approach to model the track’s concrete structure, this research integrates these parameters with the track’s numerical representation, taking into account the role of internal reinforcement. Through an in-depth examination of track deformation, the interstitial gap, and damage progression within the track, it is demonstrated that comprehensive consideration of both the material’s constitutive model and reinforcement structuring is imperative. The analysis results indicate that the heave’s amplitude and wavelength exert limited influence on the deformation amplitude ratio, whereas variations in heave characteristics significantly alter the wavelength transmission ratio, engendering a distinct “M” shaped gap profile. It is observed that the propensity for material damage escalates in areas experiencing pronounced tensile stress, particularly under conditions of reduced wavelength and increased amplitude heave, necessitating prioritized attention in track maintenance protocols.

隧道底板波浪对高速铁路无砟轨道结构变形和损伤行为的影响
高速铁路在山区的广泛发展凸显了隧道底板隆起所带来的巨大挑战,影响了无砟轨道的运行可靠性。这种隆起会导致轨道变形和结构受损,严重破坏轨道的运行安全性和适用性。这项研究引入了一个复杂的非线性分析模型,囊括了轨道系统、隧道基础设施和围护地质环境之间的相互作用,从而加深了人们对无砟轨道对隧道地面隆起的机械响应的理解。这项研究利用混凝土损伤塑性方法来模拟轨道的混凝土结构,并将这些参数与轨道的数值表示相结合,同时考虑到内部钢筋的作用。通过深入研究轨道变形、间隙和轨道内的损坏进展,证明必须全面考虑材料的构成模型和钢筋结构。分析结果表明,波浪的振幅和波长对变形振幅比的影响有限,而波浪特性的变化会显著改变波长传输比,从而产生明显的 "M "形间隙轮廓。据观察,在拉伸应力明显的区域,尤其是在波长减小和波幅增大的情况下,材料损坏的可能性会增加,因此有必要在轨道维护协议中予以优先关注。
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来源期刊
Transportation Geotechnics
Transportation Geotechnics Social Sciences-Transportation
CiteScore
8.10
自引率
11.30%
发文量
194
审稿时长
51 days
期刊介绍: Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.
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