Internal Fluidization in Granular Soils

Alsaydalani, M. O. A.; Clayton, C. R. I.

doi:10.1061/(asce)gt.1943-5606.0001039

Cited by 50 publications

(45 citation statements)

References 21 publications

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“…This will be more explicitly developed in the theoretical section. This behavior is in contrast with the experiments performed by Alsaydalani and Clayton for beds with comparable initial heights but smaller particle diameters and considerably smaller orifice diameters. In their experiments, they did not observe the saturation seen in Figure .…”

Section: Results For Fluidization‐defluidization Experimentscontrasting

confidence: 99%

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Parameters affecting the localized fluidization in a particle medium

Mena

Luu²,

Cuéllar³

et al. 2017

AIChE Journal

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The current study presents experiments for the initial stages of fluidization induced by a localized fluid injection. The process was studied by recording high-speed videos in a 2-D-region far from the boundaries using Planar Laser Induced Fluorescence and Refractive Index Matching. The experimental setup allowed for several parameters to be systematically studied including particle sizes, initial bed heights, and injection port diameters. The results show that the critical flow rate required for fluidization is primarily dependent on the initial height of the granular bed. However, this dependence is not a linear relation but progressively plateaus for larger heights. Conversely, the diameter of the chimney relates only slightly to the injection port diameter and significantly more to the diameter of the particles. (c) are average of the video sequence; (d), (e), and (f) are standard deviations of the video sequence. (a) and (d) are of a static bed, (b) and (e) show a bed with a fluidized cavity and pictures (c) and (f) show a chimney. Figure (d) is solid black indicating no movement and resulting zero standard deviation. Image processing done by ImageJ. 37 Solid symbols are for the injection port of D 5 10 mm and open symbols are for D 5 40 mm. Symbols are as follow: Circles, 3 mm particles; squares, 5 mm; triangles, 7 mm; hexagon, 10 mm. [Color figure can be viewed at wileyonlinelibrary.com]

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Section: Results For Fluidization‐defluidization Experimentscontrasting

confidence: 99%

“…Currently around 75% of all polyolefins are made by a fluidized‐bed process . Although their applications are broad and there are many studies on fluidized beds, there is not a lot of information on the phenomenology of fluidization when it is induced by local fluid flows …”

Section: Introductionmentioning

confidence: 99%

Parameters affecting the localized fluidization in a particle medium

Mena

Luu²,

Cuéllar³

et al. 2017

AIChE Journal

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“…Van Zyl et al . and Alsaydalani and Clayton experimentally studied the fluidization mechanism caused by the outflow of pressurized water from leaking pipes. Although the study of sinkholes due to sewer pipe failure has attracted increasing attention, further studies are needed to obtain a better understanding of the dynamics of the relevant soil–water interactions.…”

Section: Introductionmentioning

confidence: 99%

“…Cui et al [15,16] attributed sinkhole formation to the outflow of pressurized water from a deteriorated underground region of a pipeline and performed numerical simulations based on this process. Van Zyl et al [17] and Alsaydalani and Clayton [18] experimentally studied the fluidization mechanism caused by the outflow of pressurized water from leaking pipes. Although the study of sinkholes due to sewer pipe failure has attracted increasing attention, further studies are needed to obtain a better understanding of the dynamics of the relevant soil-water interactions.…”

Section: Introductionmentioning

confidence: 99%

A coupled discrete element model for the simulation of soil and water flow through an orifice

Tang

Chan

Zhu

2017

Num Anal Meth Geomechanics

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Summary Soil erosion around defective underground pipes can cause ground collapses and sinkholes in urban areas. Most of these soil erosion events are caused by fluidization of the surrounding soil with subsequent washing into defective sewer pipes. In this study, this soil erosion process is simplified as the gradual washout of sand particles mixed with water through an orifice. The discrete element method is used to simulate the large deformation behavior of the sand particles, and the Darcy fluid model is coupled with this approach to simulate fluid flow through porous sand media. A coupled 3D discrete element model is developed and implemented based on this scheme. To simulate previous experiments using this coupled model considering the current computing capacity, we incorporated a ‘supply layer’ to study the continuous erosion process. The coupled model can predict the erosion flow rates of sand and water and the shape of erosion void. Thus, the model can be used as an effective and efficient tool to investigate the soil erosion process around defective pipes. Copyright © 2017 John Wiley & Sons, Ltd.

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“…Figure 3. Its maximum and minimum void ratios are 0.79 and 0.46, respectively [29]. Its mean diameter (D 50 ) is 0.82 mm, and its effective grain size (D 10 ) is 0.65 mm with a uniformity coefficient (D 60 /D 10 ) at 1.38.…”

Section: Experimentationmentioning

confidence: 99%

Effect of Sample Reconstitution Methods on the Behaviors of Granular Materials under Shearing

Yang

et al. 2018

Journal of Testing and Evaluation

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The effect of sample reconstitution methods on the behavior of sand under shearing is investigated by using the first commercially available Variable Direction Dynamic Cyclic Simple Shear System. Three sample reconstitution methods are used in this study, the dry funnel method, air pluviation, and dried wet tamping. Because only dry specimens can be tested in many simple shear apparatuses, a new method called the dried wet tamping is used in this study, in which the soil sample prepared by the wet tamping is dried before being tested. Leighton buzzard sand at various relative densities is tested in monotonic, one-directional cyclic and two-dimensional circular cyclic simple shear tests. Experimental results show that different sample reconstitution methods have limited effects on the shear behavior in monotonic loading tests. On the contrary, the sample reconstitution methods greatly influence the dynamic responses of sand, including the undrained one-dimensional cyclic and two-dimensional circular cyclic loading. The liquefaction resistance is the greatest by using the dried wet tamping method, followed by the dry funnel method and air pluviation method. These test results are also compared with previous studies on sample reconstitution methods, and their similarities and differences are analyzed.

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Internal Fluidization in Granular Soils

Cited by 50 publications

References 21 publications

Parameters affecting the localized fluidization in a particle medium

Parameters affecting the localized fluidization in a particle medium

A coupled discrete element model for the simulation of soil and water flow through an orifice

Effect of Sample Reconstitution Methods on the Behaviors of Granular Materials under Shearing

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