Transport and deposition of suspended particles in saturated porous media: effect of hydrodynamic forces and pore structure

Zhang, Pengyuan; Bai, Bing; Jiang, Sichen; Wang, Pengcheng; Li, Huile

doi:10.2166/ws.2016.011

Cited by 21 publications

(13 citation statements)

References 19 publications

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“…It shows that the migration velocity of SPs is smaller than the water velocity ( u / u 0 = 0.85–0.9 < 1), especially for particles of D 50 = 47 μm because of the logging effect. This is different from the migration process of small‐sized SPs ( u / u 0 > 1) (Ahfir et al, ; Zhang et al, ), where the size exclusion effect seems to be more predominant than the detours of transport paths. It can be seen from Figure b that the migration velocity of SPs decreases with increasing particle size for different Darcy velocities ( v = 0.066 and 0.199 cm/s) and temperatures ( T = 15 and 55°C).…”

Section: Resultsmentioning

confidence: 77%

The effect of temperature on the seepage transport of suspended particles in a porous medium

Bai

Long

Rao

et al. 2016

Hydrological Processes

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The main purpose of this study is to experimentally investigate the effect of temperature on the seepage transport of suspended particles (SP) with a median diameter of 10–47 μm in a porous medium for various seepage velocities. The results show that the rise of temperature accelerates the irregular movements of SPs in the porous medium and reduces their migration velocity. As a result, the pore volume corresponding to the peak value of the breakthrough curves is apparently delayed, and the peak value in the effluent is decreased. The migration velocity of SPs decreases with increasing particle size, regardless of the Darcy velocity and temperature. The longitudinal dispersivity of SPs decreases slightly with increasing temperature and then remains almost unchanged. Larger particles experience more irregular movements induced by the limit of pore size, which leads to a larger dispersivity. The deposition coefficient increases with increasing temperature, especially in the case of a high seepage velocity, and then tends to be stable. The deposition coefficient for large‐sized particles is higher than that for small‐sized particles, which can be attributed to the restriction of large‐sized particles by the narrow pores in the porous medium. The recovery rate decreases slightly with the increase of temperature until a critical value is reached, beyond which it remains almost unchanged. In summary, temperature is a significant factor affecting the transport and deposition of SPs in the porous medium, and the transport parameters such as particle velocity, dispersivity, and deposition coefficient.

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Section: Resultsmentioning

confidence: 77%

The effect of temperature on the seepage transport of suspended particles in a porous medium

Bai

Long

Rao

et al. 2016

Hydrological Processes

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“…is paper selects sandy gravel soil samples from the first phase of the project of Luoyang Urban Rail Transit Line 2 to conduct a large-scale triaxial test. e purpose is to investigate two typical stress state change processes (namely, loading and unloading stress paths) and then determine the stress-strain relationship characteristics and volumetric strain-axial strain characteristics, as well as the seepage effect [30,31] and damage mechanism of the soil layer [24,32,33].…”

Section: Test Schemesmentioning

confidence: 99%

A Constitutive Model of Sandy Gravel Soil under Large‐Sized Loading/Unloading Triaxial Tests

Zhang

Feng³

et al. 2021

Advances in Civil Engineering

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Based on large-scale triaxial tests of sandy gravel materials, the strength and deformation characteristics under loading/unloading conditions are analyzed. At the same time, the applicability of the hyperbolic constitutive model to sandy gravel is studied using experimental data. The results indicate that sandy gravel under low confining pressures (0.2 and 0.4 MPa) shows a weak softening trend; the higher the confining pressure, the more obvious the hardening tendency (0.6 and 0.8 MPa) and the greater the peak strength. During unloading tests, strain softening occurs, and the peak strength increases with increasing confining pressure. During loading tests, dilatancy appears when the confining pressure is low (0.2 MPa). With increasing confining pressure (0.4, 0.6, and 0.8 MPa), the dilatancy trend gradually weakens, and the cumulative volume tric strain increases, which reflects the relevance of the stress paths. Through research, it is found that the hyperbolic constitutive model has good applicability to sandy gravel soils, and the corresponding model parameters are obtained.

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“…Evolution of Solute Migration. Figure 9 shows a calculation model based on the following assumptions: when the waste container is damaged, the bentonite is completely saturated under the long-term action of groundwater and the external water head, the temperature of the waste container and the solute concentration at the inner boundary remain constant [28], C 0 � 1 mol/m 3 , and the initial soil saturation is 1.…”

Section: Effect Of Joints On the Solute Migrationmentioning

confidence: 99%

The Healing Process of the Joints between Buffer Material Blocks and the Influence on Solute Migration

Zhou

Liu

et al. 2021

Advances in Civil Engineering

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A set of thermo-hydro-mechanical coupling control equations was established, and the healing process of the joints between Gaomiaozi bentonite (GMZ01) buffer material blocks and the influence of the joint parameters were numerically simulated. The calculations consider the effect of joints on solute migration, the permeability and thermal conductivity of the buffer material, and the evolution of the healing effect. The effects of the joint design parameters, including the type, number, width, splicing form, and average dry density of the joint, are investigated. Studies show that, under an external water head, the joints will become hydraulic priority channels due to their higher permeability, which will shorten the saturation time of the blocks. As the bentonite gradually saturates, the swelling force compresses the joint material. This action improves the overall uniformity of the buffer material and reduces the priority channel effect. Meanwhile, the final average permeability and diffusion coefficient of the buffer material are found to mainly depend on the average dry density of the buffer material. The higher the average dry density of the buffer material is, the lower the final average permeability and diffusion coefficient are, whereas the distribution of joints and the block splicing are less affected by the average dry density of the buffer material. The findings of this study can provide a reference for the design of bentonite buffer material blocks in the repository.

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Transport and deposition of suspended particles in saturated porous media: effect of hydrodynamic forces and pore structure

Cited by 21 publications

References 19 publications

The effect of temperature on the seepage transport of suspended particles in a porous medium

The effect of temperature on the seepage transport of suspended particles in a porous medium

A Constitutive Model of Sandy Gravel Soil under Large‐Sized Loading/Unloading Triaxial Tests

The Healing Process of the Joints between Buffer Material Blocks and the Influence on Solute Migration

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