Microscopic mechanism of content of fine particles affecting seepage erosion law

LIANG Yue; RAN Yuxing; XU Bin; ZHANG Xinqiang; HE Huiru

doi:10.11779/CJGE20231105

Volume 47 Issue 5

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Chinese Journal of Geotechnical Engineering > 2025 > 47(5): 1099-1106. > DOI: 10.11779/CJGE20231105

LIANG Yue, RAN Yuxing, XU Bin, ZHANG Xinqiang, HE Huiru. Microscopic mechanism of content of fine particles affecting seepage erosion law[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(5): 1099-1106. DOI: 10.11779/CJGE20231105

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Microscopic mechanism of content of fine particles affecting seepage erosion law

LIANG Yue^{1, 2, 3,},
RAN Yuxing^1, ,,
XU Bin^{1, 2, 3},
ZHANG Xinqiang⁴,
HE Huiru¹

1.
The College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2.
National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China
3.
Key Laboratory of Hydraulic and Waterway Engineering of Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China
4.
Jiangxi Port Group Co., Ltd. Jiangxi Water Transport Consulting Co., Ltd, Nanchang 330008, China

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Received Date: November 14, 2023
Available Online: October 22, 2024

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Abstract

Abstract

Exploring the transport characteristics of fine particles is of great engineering significance for clarifying the law of seepage erosion, as the content of fine particles will directly affect the resistance of soils to erodibility. Based on the self-developed PIV/PLIF seepage erosion test system, the effects of the initial content of fine particles on the flow velocity and the critical hydraulic gradient during the seepage erosion process are investigated. The results show that: (1) The process of seepage erosion can be basically divided into three phases, i.e., stable, localized destruction and overall destruction, according to the evolution law of flow velocity. This leads to the definition of the critical hydraulic gradients for localized and overall destruction, and the critical hydraulic gradients of the specimen increase with the increase of the initial content of fine particles. (2) When the initial content of fine particles is less than 20%, the specimen is in an underfilled state, exhibiting an overall destruction phenomenon, and the actual measured average flow velocity of the specimen accelerates with the increase of the hydraulic gradient after overall destruction. When the initial content of fine particles exceeds 30%, the specimen is essentially in a fully filled state, with an extremely high resistance to erodibility and the overall measured average flow speed of the specimen is relatively low. (3) During the phase of localized destruction, the rate of variation in the measured average flow speed of the specimen decreases significantly with the increase of the initial content of fine particles. It is known that the initial content of fine particles has a significant impact on the microscopic mechanism of seepage erosion for the specimen.

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