JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A

Accepted manuscript available online (unedited version)

Dynamic response of the ground beneath a high-speed railway based on typical upper Shanghai clays involving water table change

Author(s): Jing HU¹, Chengming YE¹, Juntao JIANG¹, Shujing WU¹, David THOMPSON², Xuecheng BIAN³
Affiliation(s): ¹College of Civil Engineering, Fuzhou University, Fuzhou 350108, China; more
Corresponding email(s): jingh@fzu.edu.cn
Key Words: Dynamic response; Excess pore pressures; Water table rise; High-speed train; 2.5D FEM

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Jing HU¹, Chengming YE¹, Juntao JIANG¹, Shujing WU¹, David THOMPSON², Xuecheng BIAN³. Dynamic response of the ground beneath a high-speed railway based on typical upper Shanghai clays involving water table change[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2400345

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author="Jing HU¹, Chengming YE¹, Juntao JIANG¹, Shujing WU¹, David THOMPSON², Xuecheng BIAN³",
journal="Journal of Zhejiang University Science A",
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doi="https://doi.org/10.1631/jzus.A2400345"
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doi="https://doi.org/10.1631/jzus.A2400345"

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A1 - Jing HU¹
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A1 - Shujing WU¹
A1 - David THOMPSON²
A1 - Xuecheng BIAN³
J0 - Journal of Zhejiang University Science A
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doi="https://doi.org/10.1631/jzus.A2400345"

Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: A rising water table increases soil water content, reduces soil strength, and amplifies vibrations under identical train loads, thereby posing greater risks to train operations. To investigate this phenomenon, we used a 2.5D finite element model (FEM) of a coupled vehicle-embankment-ground system based on Biot's theory. The ground properties were derived from a typical soil profile of the Yangtze River basin, using geological data from Shanghai. The findings indicate that a rise in the water table leads to increased dynamic displacements of both the track and the ground. This amplification effect extends beyond the depth of the water table, impacting the entire embankment-foundation cross-section, and intensifies with higher train speeds. However, the water table rise has a limited impact on the critical speed of trains and dominant frequency contents. The dy-namic response of the embankment is more significantly affected by water table rises within the subgrade than by those within the ground. When the water table rises into the subgrade, significant excess pore pressure is generated inside the embankment, causing a substantial drop in effective stress. As a result, the stress path of the soil elements in the subgrade approaches the Mohr-Coulomb failure line, increasing the likelihood of soil failure.

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