水压加剧粗粒土冻胀的机理：对高速铁路路基防冻的启示

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics Pub Date : 2025-05-01 DOI:10.1016/j.trgeo.2025.101590

Xiaoyun Hao , Wei Ma , Wenjie Feng , Zhi Wen , Lianhai Zhang

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引用次数: 0

摘要

粗粒土因其不具有冻胀敏感性，一般用于寒冷地区的基础设施中，以减轻工程的霜冻损害；然而，在某些情况下，粗粒填料在水压作用下也会发生冻胀。为了揭示水压力对粗粒土冻胀的影响机理，建立了考虑水压力作用下外部水通过未冻水膜向冰透镜迁移的粗粒土冻胀模型，并利用已有研究成果对模型进行了验证。随后，基于验证模型，分析了水力压力和细粒含量对粗粒土冻胀的影响机理。计算结果表明，水压力通过增大未冻水膜孔隙水压力梯度而加剧冻胀。此外，随着细粒含量的增加，冻胀率增加，这是由于膜的增厚，这有利于水的流动和冰的分离。灰色关联分析表明，水压力对粗粒土冻胀的影响比细粒土更显著。最后，对高速铁路路基发生的冻害进行了探讨，并提出了预防冻害的措施。

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The mechanism of hydraulic pressure aggravates coarse-grained soil frost heave: Implication for frost prevention to high-speed railway subgrade

Coarse-grained soil is generally used in cold-regions infrastructure to mitigate the frost damage to engineering because of its non-frost heave susceptibility; however, in certain cases, coarse-grained fill has been observed to experience frost heave under hydraulic pressure. To reveal the mechanism of hydraulic pressure on coarse-grained soil frost heave, a model was developed to describe the frost heave in coarse-grained soil, incorporating the migration of external water to ice lenses through an unfrozen water film under hydraulic pressure, then the model was validated using published results. Subsequently, based on the validated model, the influence mechanism of hydraulic pressure and fine content on coarse-grained soil frost heave were analyzed. The calculation results demonstrate that the hydraulic pressure aggravates frost heave by increasing the pore water pressure gradient in the unfrozen water film. Additionally, frost heave rate increases with fine content because of the thickening of the film, which facilitates water flow and ice segregation. Furthermore, gray correlation analysis demonstrated that the impact of hydraulic pressure on frost heave in coarse-grained soil is more significant than that of fine content. Finally, the study discusses frost damage that occurred in high-speed railway subgrade and proposes the preventive measures.

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来源期刊

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.