Impact of suffusion on the cyclic and post-cyclic behaviour of an internally unstable soil

Mehdizadeh, Amirhassan; Disfani, Mahdi M.; Evans, Robert; Arulrajah, Arul

doi:10.1680/jgele.18.00128

Cited by 14 publications

(10 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reduction of the soil strength with suffusion was observed when the soil sample experience a monotonic compression test [22]. But there are also several studies showing that the eroded soil samples may demonstrate stronger resistance against liquefaction and stronger undrained shear strength [23] [24]. With advanced techniques such as micro-CT and plane laser-induced fluorescence (PLIF , the visualization of suffusion phenomenon can be obtained during experimental tests [25] [26].…”

Section: Introductionmentioning

confidence: 99%

Microscopic mechanism of particle detachment in granular materials subjected to suffusion in anisotropic stress states

Wautier

Zhou

2021

Acta Geotech.

View full text Add to dashboard Cite

Suffusion refers to a special form of internal erosion characterized by the selective erosion of the finest particles of a soil under the action of an internal fluid flow. In this work, the microscopic mechanism of particle detachment in binary mixtures subjected to suffusion under different flow directions is analyzed. We use the coupled lattice Boltzmann method (LBM) and discrete element method (DEM) to simulate the suffusion process in a granular sample subjected to an anisotropic stress state. When the macro flow direction is aligned with the principal direction of compression, it is found that the fluid flow is more intense, which increases erosion.The stress anisotropy also influences the detachment direction that is not necessarily correlated with the macroscopic flow direction. The sample's anisotropic stress state is responsible for directional variations in microstructural properties during the suffusion under different flow directions. From a micro scale point of view, a contact sliding index P and a particle detachment index Δ are defined to demonstrate that fluid-induced sliding dominates for particles about to detach.

show abstract

Section: Introductionmentioning

confidence: 99%

Microscopic mechanism of particle detachment in granular materials subjected to suffusion in anisotropic stress states

Wautier

Zhou

2021

Acta Geotech.

View full text Add to dashboard Cite

show abstract

“…The interplay of rainfall and seismic activity significantly influences the suffusion dynamics within soils. Rainfall can exacerbate soil saturation and elevate pore water pressure, rendering the soil susceptible to liquefaction [4,5].…”

Section: Interactions Of Suffusion With Rainfall and Seismic Activitymentioning

confidence: 99%

Soil Suffusion under the Dual Threat of Rainfall and Seismic Vibration

Najar,

Ahmadi,

Khalik

et al. 2023

IJDNE

View full text Add to dashboard Cite

This paper employs the systematic literature review (SLR) methodology to investigate the combined effects of seismic vibrations and rainfall on soil suffusion, a process leading to soil instability. Earthquake activity can accelerate soil liquefaction, exacerbating suffusion, while heavy rainfall can increase soil weight, inducing instability. Consequently, the repercussions of seismic activity and rainfall on suffusion may induce further damage and instability to civil infrastructure. The review reveals that the compound impact of rainfall and seismic vibrations can precipitate severe damage and instability, primarily through two mechanisms. First, earthquakes can catalyze soil liquefaction, inciting soil movement and amplifying the suffusion process. Second, heavy rainfall can saturate the soil, augmenting its weight and rendering it unstable, thereby inducing suffusion. However, the review also reveals a significant gap in understanding and mitigating suffusion triggered by simultaneous rainfall and seismic activity. Current techniques for identifying and mitigating such suffusion are inadequate, highlighting the need for further research. This review posits that the interaction of rainfall and seismic vibrations as a catalyst for soil suffusion demands additional scrutiny. It provides a comprehensive understanding of suffusion and the impact of rainfall and seismic vibrations on suffusive soils, serving as a basis for future studies on this important issue.

show abstract

“…However, some research have found that the soil strength of corroded specimens is weakened [7] , but others have found that the corroded specimens have stronger liquefaction resistance under cyclic shear [8] [9] . This means the influence of suffusion on soil has not been fully understood.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical Analysis of Detachment Mechanisms of Suffusion

Ma¹,

Wautier²,

Zhou³

2021

14th WCCM-ECCOMAS Congress

View full text Add to dashboard Cite

Suffusion is a typical phenomenon of seepage-induced internal erosion, corresponding to fine particles erosion from the coarse matrix under the action of a fluid. A three-dimensional and spatially resolved fluid-solid coupling method based on lattice Boltzmann method (LBM) and discrete element method (DEM) is proposed to simulate suffusion in binary mixtures under anisotropic stress states. Based on such numerical simulations, eroded grains are identified and the mean squared displacement as well as the ratio between drag force and contact force of these eroded particles are computed to describe the detachment mechanism. The results show that the fluid force acting on eroded particles increases in the simulation which corresponding to the steep slope in squared displacements. Regardless of the initial state, the ratio between the fluid force and the contact force of the eroded particles displays a downward trend over time, reflecting the gradual dominance of the fluid force, which eventually leads to particle detachment and erosion. Based on the judgment between the direction of the fluid force and the direction of the contact force, a contact index P is then proposed to determine whether the contact is going to slide or strengthen under the action of the fluid. The distribution of indexes P for the contacts of eroded particles just prior to their detachment reflects that fluid induced sliding dominates. A particle detachment index is thus proposed and the overall detachment sensitivity of the binary samples is eventually investigated with respect to the fluid flow direction.

show abstract

Impact of suffusion on the cyclic and post-cyclic behaviour of an internally unstable soil

Cited by 14 publications

References 27 publications

Microscopic mechanism of particle detachment in granular materials subjected to suffusion in anisotropic stress states

Microscopic mechanism of particle detachment in granular materials subjected to suffusion in anisotropic stress states

Soil Suffusion under the Dual Threat of Rainfall and Seismic Vibration

Micromechanical Analysis of Detachment Mechanisms of Suffusion

Contact Info

Product

Resources

About