Experimental study on migration and deposition of particles under alternating dynamic and static loads

GAO Feng; ZHANG Junhui; ZHANG Sheng; ZHENG Jianlong; SHENG Daichao

doi:10.11779/CJGE20230168

Volume 46 Issue 5

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Chinese Journal of Geotechnical Engineering > 2024 > 46(5): 1057-1066. > DOI: 10.11779/CJGE20230168

GAO Feng, ZHANG Junhui, ZHANG Sheng, ZHENG Jianlong, SHENG Daichao. Experimental study on migration and deposition of particles under alternating dynamic and static loads[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(5): 1057-1066. DOI: 10.11779/CJGE20230168

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Experimental study on migration and deposition of particles under alternating dynamic and static loads

1.
National Engineering Research Center of Highway Maintenance Technology, School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China
2.
Department of Science and Information, Qinghai Communications Holding Group Co., Ltd., Xining 810000, China
3.
National Engineering Research Center for High-Speed Railway Construction, School of Civil Engineering, Central South University, Changsha 410075, China
4.
School of Civil & Environmental Engineering, University of Technology Sydney, Sydney NSW 2007, Australia

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Received Date: February 25, 2023
Available Online: June 01, 2023

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Abstract

Abstract

The study on the migration and deposition of suspended particles in subgrade is important to reveal the generation and disaster-causing mechanism of mud pumping. The effects of magnitude of dynamic loads, intermittent duration of static loads and repetition number of alternating dynamic and static loads on the migration and deposition of particles are studied by carrying out the mud pumping tests on the layered gravel-sandy silt column. According to the hydrodynamic response characteristics of specimens, the driving mechanism of particle migration is analyzed. The test results show that the suspended particles migrate upward under hydrodynamic force and settle under gravity during the interval of static loads, which results in the fluctuating growth of slurry turbidity in the gravel layer. The particle suspension increment tends to decrease with the increasing repetition of alternating dynamic and static loads, and these particles gradually clog gravel pores and inhibit mud pumping to a certain extent. Increasing the dynamic frequency and stress can further reduce the internal stability of the sandy silt surface layer. However, compared with increasing the dynamic stress, increasing the loading frequency is more beneficial to increase the particle migration mass and vertical migration distance.
- mud pumping,
- laboratory test,
- particle migration,
- excess pore pressure

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