Abstract
Subgrade mud pumping is a worldwide problem that seriously threatens railway track stability and operational safety. This paper analyzes the influence of Kaolin content (plasticity index) on the characteristics of saturated subgrade mud pumping under cyclic loading using a self-developed test model. Test samples consist of clay mixed with 10%, 20%, and 30% of Kaolin. The results show that the addition of Kaolin can reduce the void ratio (for a given initial dry density) and create a more plastic soil which is less prone to fluidisation under loading, thus reducing the axial strain and excess pore water pressure which helps to mitigate the problem of mud pumping. Based on our test results, we put forward a criterion to distinguish whether mud pumping occurs. In addition, we find that the excess pore water pressure gradient in subgrade soil plays a key role in the migration of fine particles and that the generation of an interlayer under cyclic loading can also promote subgrade mud pumping.
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Data Availability
The data that supports the findings of this research are available from the corresponding author, upon a reasonable request.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (51978674), the Science and Technology Research and Development Project of China National Railway Group Co., Ltd. (L2022G002), and Innovation and Entrepreneurship Training Program for College Students in Jiangsu Province (202311641122Y). The laboratory tests were performed in the National Engineering Research Center of High-Speed Railway Construction Technology with significant support from Dr. Zhang of Central South University. The author is grateful to several anonymous reviewers for their constructive comments and suggestions. The authors also thank AiMi Academic Services (www.aimieditor.com) for their English language editing and review services.
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Yu Ding: Writing—Original Draft; Methodology; Data Curation; Formal analysis; Visualization. Yu Jia: Investigation; Data Curation; Writing—Original Draft; Visualization. Zhongling Zong: Investigation; Data Curation; Methodology. Xuan Wang: Writing—Review & Editing; Supervision. Jiasheng Zhang: Conceptualization; Writing—Review & Editing; Supervision. Xiaobin Chen: Resources; Project administration.
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Ding, Y., Jia, Y., Zong, Z. et al. Study on characteristics and mechanism of subgrade mud pumping under heavy-haul train loads. Bull Eng Geol Environ 83, 63 (2024). https://doi.org/10.1007/s10064-024-03555-7
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DOI: https://doi.org/10.1007/s10064-024-03555-7