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Research paper | Open Access

Influence of artificial freezing on liquefaction characteristics of Nanjing sand

Jie Zhou1, Zeyao Li1( ), Wanjun Tian2, Jiawei Sun2
Department of Underground Building and Engineering, Tongji University, Shanghai, China
China Construction Second Engineering Bureau Co., LTD, Nanjing, China
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Abstract

Purpose

This study purposes to study the influence of artificial freezing on the liquefaction characteristics of Nanjing sand, as well as its mechanism.

Design/methodology/approach

was studied through dynamic triaxial tests by means of the GDS dynamic triaxial system on Nanjing sand extensively discovered in the middle and lower reaches of the Yangtze River under seismic load and metro train vibration load, respectively, and potential hazards of the two loads to the freezing construction of Nanjing sand were also identified in the tests.

Findings

The results show that under both seismic load and metro train vibration load, freeze-thaw cycles will significantly reduce the stiffness and liquefaction resistance of Nanjing sand, especially in the first freeze-thaw cycle; the more freeze-thaw cycles, the worse structural behaviors of silty-fine sand, and the easier to liquefy; freeze-thaw cycles will increase the sensitivity of Nanjing sand’s dynamic pore pressure to dynamic load response; the lower the freezing temperature and the effective confining pressure, the worse the liquefaction resistance of Nanjing sand after freeze-thaw cycles; compared to the metro train vibration load, the seismic load in Nanjing is potentially less dangerous to freezing construction of Nanjing sand.

Originality/value

The research results are helpful to the construction of the artificial ground freezing of the subway crossing passage in the lower reaches of the Yangtze River and to ensure the construction safety of the subway tunnel and its crossing passage.

Keywords

MetroFoundationNanjing sandArtificial formation freezing methodSand liquefactionDynamic triaxial test

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Railway Sciences
Volume 2 Issue 1,
April 2023
Pages 13-32
DOI: 10.1108/RS-01-2023-0008
Cite this article:
Zhou J, Li Z, Tian W, et al. Influence of artificial freezing on liquefaction characteristics of Nanjing sand. Railway Sciences, 2023, 2(1): 13-32. https://doi.org/10.1108/RS-01-2023-0008

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Received: 31 January 2023
Revised: 12 February 2023
Accepted: 12 February 2023
Published: 30 March 2023
© Jie Zhou, Zeyao Li, Wanjun Tian and Jiawei Sun. Published in Railway Sciences.

This article is published under the Creative Commons Attribution (CC BY 4.0) licence. Anyone may reproduce, distribute, translate and create derivative works of this article (for both commercial and non-commercial purposes), subject to full attribution to the original publication and authors. The full terms of this licence may be seen at http://creativecommons.org/licences/by/4.0/legalcode
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