Evolution of layered physical properties in soluble mixture: Experimental and numerical approaches

Lee, Jong Sub; Tran, Khoa M.; Lee, Chang-Ho

doi:10.1016/j.enggeo.2012.06.008

Cited by 16 publications

(4 citation statements)

References 11 publications

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“…The sediment contracts yet the void ratio increases during dissolution (Fam et al, 2002;Shin & Santamarina, 2009;Truong et al, 2010;Muir Wood et al, 2010;Tran et al, 2012;McDougall et al, 2013aMcDougall et al, , 2013b) and a 'honeycomb fabric' emerges (Shin et al, 2008;Shin & Santamarina, 2009). The value of k 0 decreases often to k a before it recovers (experiments in Shin & Santamarina (2009)), and shear wave velocity decreases and attenuation increases during dissolution (Fam et al, 2002;Truong et al, 2010;Lee et al, 2012). The peak friction angle is lower after dissolution (Fam et al, 2002 and the cone penetration resistance decreases with increasing dissolution (Cha & Santamarina, 2013).…”

Section: Introductionmentioning

confidence: 92%

Dissolution of randomly distributed soluble grains: post-dissolution k₀-loading and shear

Cha¹,

Santamarina²

2014

Géotechnique

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Sediments experience mineral dissolution in most natural settings, and as a result of engineered processes such as carbon dioxide injection. The consequences of mineral dissolution are studied using the three-dimensional discrete-element method by gradually dissolving randomly distributed soluble grains in a laterally constrained cell under constant vertical stress. Either additional vertical load under zero lateral strain or shear loading are applied after dissolution. Results show that dissolution is accompanied by global horizontal stress change, increase in vertical displacement and porosity, and decrease in coordination number. Post-dissolution, sediments are more compressible; shear loading encounters a diminished peak strength and reduced dilative tendency in sediments that experienced dissolution; however, all specimens evolve towards a common 'critical state' strength and sediment fabric at a large strain (in the absence of reprecipitation, changes in grain shape, or changes in grain size distribution). The analysis of micromechanical parameters shows that the total number of contacts decreases during dissolution and remaining contacts carry higher forces. Higher granular interlocking hinders settlement and leads to the development of higher fabric and force anisotropy during dissolution. Granular arching effectively resists vertical displacement around dissolving grains, a honeycomb fabric emerges and the specimen gains a higher porosity during dissolution. Overall, the extent of dissolution (soluble fraction) and the level of particle interlocking/angularity define the evolution of micro-and macro-scale parameters during dissolution and its response to subsequent loading.

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Section: Introductionmentioning

confidence: 92%

Dissolution of randomly distributed soluble grains: post-dissolution k₀-loading and shear

Cha¹,

Santamarina²

2014

Géotechnique

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“…Because DEM deals with rigid, not deformable, particles, artificial overlapping between pairs of contacting particles is used to calculate the contact force . Particle interactions between soft–soft, soft–hard, or hard–hard particles can be emulated by the overlapping area and contact stiffness .…”

Section: Discrete Element Simulationsmentioning

confidence: 99%

Behavior of sand–rubber particle mixtures: experimental observations and numerical simulations

Lee

Shin

Lee

2014

Num Anal Meth Geomechanics

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A series of laboratory experiments and numerical simulations are conducted to explore the characteristics of mixtures composed of sand and rubber particles of the same median diameter. The mixtures are prepared with different volumetric sand fractions (sf = V sand /V total ). The experiment focuses on assessing the strain level on the characteristics of the mixture with the volume fraction of each component. Numerical simulations using the discrete element method are performed to obtain insight into the microscale behavior and internal mechanism of the mixtures. The experimental results show that the behavior of the mixtures is dependent on the relative sand and rubber particles composition with variation in the strain levels. The numerical simulation reveals the effect of the soft rubber particle inclusion in the mixture on the micromechanical parameters. In low sand fraction mixtures, a high shear stress along the contact is mobilized, and the stress state is driven to a more anisotropic condition because of the relatively high particle friction angle of the rubber. The rubber particles play different roles with the strain level in the mixture, including increasing the coordination number and controlling plasticity of the mixture in a small strain, preventing buckling of the force chain in an intermediate strain, and leading to contractive behavior in a large strain. Figure 6. Strength properties: (a) shear stress versus lateral strain under a vertical effective stress of 40 kPa;(b) frictional angle at peak strength and at a large strain.

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“…In nature, mineral dissolution is a complex phenomenon that includes chemical, hydraulic, and mechanical processes developing as a function of time . Mineral dissolution initiates and progresses along with the evolution of the microstructure of the material, affecting the force transferred through the particles, stiffness, effective porosity (n), and hydraulic conductivity ( k ) . Dissolution induces not only geological problems or processes, including the subsidence of the ground, sinkholes, karst terrain, aquifer evolution, and polygonal faults, but it also has an effect on the performance of engineering systems, such as foundations and dams, nuclear waste repositories, methane hydrate production facility, and CO 2 storage systems .…”

Section: Introductionmentioning

confidence: 99%

“…Although these studies provide a quantitative analysis of the contact force acting at each contact, few photoelastic experiments were performed for the dissolution problem. Notably, most of particle‐scale dissolution phenomena in granular materials were investigated via numerical simulations, such as the discrete element method . These previous studies revealed that mineral dissolution increases the void ratio of the contracting material and attenuation but decreases shear wave velocity, in situ lateral pressure (K 0 ), and shear strength of granular materials.…”

Section: Introductionmentioning

confidence: 99%

Evolution of pore structure and hydraulic conductivity of randomly distributed soluble particle mixture

Shin

Truong

Lee

et al. 2017

Num Anal Meth Geomechanics

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The plane strain behavior of particulate mixtures containing soluble particles was investigated by conducting both laboratory tests and numerical analysis. To perform the laboratory experiments, soluble mixtures were prepared using photoelastic disks and ice disks with diameters in the ratios (D ice disk /D photoelastic disk ) of 0.5 and 0.7, and the evolution of the force chain and pore structure was monitored during the dissolution of the ice disks.Subsequently, numerical analysis was conducted by using the 2-dimensional discrete element method for the soluble mixtures, and it was compared with the experimental results. Additionally, parametric studies were implemented by varying the particle size ratios between the soluble and non-soluble particles and the volumetric fraction of the soluble particles. The results of the laboratory experiments and numerical analysis demonstrate that (1) after the dissolution of the soluble particles, the pore fabric of the specimens changed, resulting in a force chain changes, local void increases, and coordination number decreases;(2) the effects of soluble particles on the macro-behaviors of the mixtures could be divided into 3 zones based on the particle size ratios between the soluble and non-soluble particles and volumetric fraction of soluble particles. These zones were as follows: (Zone 1)-with a small total soluble volume, slight decrease in the in situ lateral pressure (K 0 ), and minor increase in the hydraulic conductivity (k); (Zone 2)-with a moderate soluble particle; the dissolution generated a honey-comb particle structure; (Zone 3)-the total soluble volume was very large, and the high volumetric fraction of the dissolving particle collapsed the pore structure, decreasing in the in situ lateral pressure (K 0 ) but increasing the hydraulic conductivity (k). The horizontal stress returned to almost the original level, and the internal arching formation increased significantly with the hydraulic conductivity (k).KEYWORDS discrete element method, dissolution, earth pressure at rest (K 0 ), hydraulic conductivity (k), pore structure, soluble mixtures

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Evolution of layered physical properties in soluble mixture: Experimental and numerical approaches

Cited by 16 publications

References 11 publications

Dissolution of randomly distributed soluble grains: post-dissolution k₀-loading and shear

Dissolution of randomly distributed soluble grains: post-dissolution k₀-loading and shear

Behavior of sand–rubber particle mixtures: experimental observations and numerical simulations

Evolution of pore structure and hydraulic conductivity of randomly distributed soluble particle mixture

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Evolution of layered physical properties in soluble mixture: Experimental and numerical approaches

Cited by 16 publications

References 11 publications

Dissolution of randomly distributed soluble grains: post-dissolution k0-loading and shear

Dissolution of randomly distributed soluble grains: post-dissolution k0-loading and shear

Behavior of sand–rubber particle mixtures: experimental observations and numerical simulations

Evolution of pore structure and hydraulic conductivity of randomly distributed soluble particle mixture

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Product

Resources

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Dissolution of randomly distributed soluble grains: post-dissolution k₀-loading and shear

Dissolution of randomly distributed soluble grains: post-dissolution k₀-loading and shear