Determination of hydro-mechanical Properties of Sand

Lins, Yvonne; Schanz, Tom

doi:10.1007/3-540-26736-0_2

Cited by 21 publications

(9 citation statements)

References 5 publications

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“…For other soils, Table 4 lists some results of past studies (Lins and Schanz 2005;Gallage and Uchimura 2010;Huang et al 1998;Salager et al 2010;Gao and Sun 2017;Birle et al 2008) on both sandy and clayey soils, of which classification of fines in some soils are plotted in Fig. 12, and S-R w relationships and their S th of these soils are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Water retention characteristics of iron ore fines

2020

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Evaluations of water retention characteristics of typical iron ore fines (IOF) were presented, which was part of experimental works for the estimation of liquefaction potential of IOF heaps. The water retention tests were conducted in a suction range from 0.1 to 106 kPa on two IOFs and two artificial soils with various testing techniques. It is observed that water retention characteristic curves of one IOF (IOF-B) converge in terms of the relationship between suction (S) and water content (w) regardless densities of specimens when S exceeds a threshold value (Sth). Based on this finding, water retention characteristics are divided into density and materials affected zones. It is also found that IOFs generally have higher water retention ability than the two artificial soils, from which discussion is made on the effect of specific surface area and mineralogy on water retention characteristics of IOF. Finally, water retention characteristics are linked to compaction curves, from which, with the consideration that degree of saturation at peaks of compaction curves is relatively constant, a safety margin of a recently proposed regulation for maritime transportation of IOF is discussed.

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Section: Resultsmentioning

confidence: 99%

Water retention characteristics of iron ore fines

2020

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“…5.3. The values of these endpoints depend strongly on the solid material [125,151]. For the following investigations, continuous fluid phases and a situation far from residual saturation are assumed.…”

Section: Non-equilibrium Momentum Exchange: Viscous Dragmentioning

confidence: 99%

Waves in partially saturated porous media

1993

International Journal of Rock Mechanics and Mining Sciences &am

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The presented research was carried out during my time as a PhD student at the Chair of Continuum Mechanics at Ruhr-University Bochum from 2010 to 2013. I would like to thank all the people who supported me during this time inside and outside the university. In particular, but not exclusively: Prof. Dr.-Ing. Holger Steeb, for professional and personal advice, the endless motivation starting with my diploma thesis in autumn 2009, the discussions and ideas, the support, the scientific freedom, and for the ignition of the spark.

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“…For example, a deformation can be induced by applying a confining stress to a porous sample, causing the pore space to decrease in size, which can invoke a change in water saturation. In addition, soils can deform during a change of water saturation (Kharaghani et al, ; Lins & Schanz, ); ink penetration in paper can induce swelling of the hydrophilic binders (Rosenholm, ); and fluid distribution in foods occurs alongside changes in the polymeric chains (Takhar, ). Furthermore, in swelling materials, fluid absorption by the solid phase causes deformation of the pore space and thus causes fluid redistribution, which is the case in super absorbent polymer particle beds in hygienic products (Diersch et al, ).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Pore‐Scale Model of Drainage in Granular Porous Media: The Pore‐Unit Assembly Method

Sweijen

Hassanizadeh

Zhuang

2018

Water Resources Research

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Dynamics of drainage is analyzed for packings of spheres, using numerical experiments. For this purpose, a dynamic pore‐scale model was developed to simulate water flow during drainage. The pore space inside a packing of spheres was extracted using regular triangulation, resulting in an assembly of grain‐based tetrahedra. Then, pore units were constructed by identifying and merging tetrahedra that belong to the same pore, resulting in an assembly of pore units. Each pore unit was approximated by a volume‐equivalent regular shape (e.g., cube and octahedron), for which a local capillary pressure‐saturation relationship was obtained. To simulate unsaturated flow, a pore‐scale version of IMPES (implicit pressure solver and explicit saturation update) was employed in order to calculate pressure and saturation distributions as a function of time for the assembly of pore units. To test the dynamic model, it was used on a packing of spheres to reproduce the corresponding measured quasi‐static capillary pressure‐saturation curve for a sand packing. Calculations were done for a packing of spheres with the same grain size distribution and porosity as the sand. We obtained good agreement, which confirmed the ability of the dynamic code to accurately describe drainage under low flow rates. Simulations of dynamic drainage revealed that drainage occurred in the form of finger‐like infiltration of air into the pore space, caused by heterogeneities in the pore structure. During the finger‐like infiltration, the pressure difference between air and water was found to be significantly higher than the capillary pressure. Furthermore, we tested the effects of the averaging, boundary conditions, domain size, and viscosity on the dynamic flow behavior. Finally, the dynamic coefficient was determined and compared to experimental data.

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Determination of hydro-mechanical Properties of Sand

Cited by 21 publications

References 5 publications

Water retention characteristics of iron ore fines

Water retention characteristics of iron ore fines

Waves in partially saturated porous media

Dynamic Pore‐Scale Model of Drainage in Granular Porous Media: The Pore‐Unit Assembly Method

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