Experimental investigation on evolution process of suffusion in gap-graded cohesionless soil

ZHANG Liangliang; DENG Gang; CHEN Rui; ZHANG Yinqi; LUO Zhiyuan

doi:10.11779/CJGE20220468

Volume 45 Issue 7

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Chinese Journal of Geotechnical Engineering > 2023 > 45(7): 1412-1420. > DOI: 10.11779/CJGE20220468

ZHANG Liangliang, DENG Gang, CHEN Rui, ZHANG Yinqi, LUO Zhiyuan. Experimental investigation on evolution process of suffusion in gap-graded cohesionless soil[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(7): 1412-1420. DOI: 10.11779/CJGE20220468

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Experimental investigation on evolution process of suffusion in gap-graded cohesionless soil

ZHANG Liangliang^{1, 2,},
DENG Gang^{1, 3},
CHEN Rui^{1, 2, ,},
ZHANG Yinqi³,
LUO Zhiyuan^{1, 2}

1.
School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China
2.
Guangdong Provincial Key Laboratory of Intelligent and Resilient Structures for Civil Engineering, Shenzhen 518055, China
3.
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

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Received Date: April 18, 2022
Available Online: February 19, 2023

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Abstract

Abstract

The suffusion involves selective erosion and gradual migration of fine particles through the voids of soil skeleton formed by coarse particles under seepage flow. As a result, redistribution of soil skeleton stress and deformation of soil may be induced. In this study, a series of suffusion tests are carried out using the triaxial erosion apparatus with measurable local pore pressure. The effects of the initial fine particle content and initial relative density on the suffusion of a gap-graded cohesionless soil are investigated. According to the spatial-temporal evolution of local hydraulic gradients along seepage path, the evolution process of the suffusion is revealed. Test results show that both the initiation and the failure hydraulic gradients of the gap-graded cohesionless soil increase with the increase of the fine particle content and relative density. The cumulative loss of fine particles decreases significantly with the increase of the relative density. When the relative density increases to a certain value under isotropic stress condition, the gap-graded cohesionless soil will change from an unstable state of seepage to a stable one. Additionally, the internal manifestation of suffusion initiation of soil is the mutation and uneven distribution of local hydraulic gradient along seepage path. The suffusion will cause the loss of fine particles, as well as the increase of the void ratio. Under the isotropic stress condition, the volume shrinkage is induced.
- gap-graded cohesionless soil,
- fine particle content,
- relative density,
- suffusion,
- local evolution characteristic

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Experimental investigation on evolution process of suffusion in gap-graded cohesionless soil

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