Quantifying granular material and deformation: Advantages of combining grain size, shape, and mineral phase recognition analysis

2009 ◽  
Vol 31 (7) ◽  
pp. 637-653 ◽  
Author(s):  
T.E. Bjørk ◽  
K. Mair ◽  
H. Austrheim
Keyword(s):  
Grain Size ◽  
Granular Material ◽  
Mineral Phase ◽  
Phase Recognition

A continuous, laboratory-size density separator for granular materials

1965 ◽  
Vol 35 (271) ◽  
pp. 536-541 ◽  
Author(s):  
M. P. Jones
Keyword(s):  
Grain Size ◽  
Granular Material ◽  
Granular Materials ◽  
Standard Laboratory ◽  
Continuous Density

SummaryDetails are given for the construction of a continuous, density separator from standard laboratory glassware and equipment. The separator can treat up to 5 g/min of granular material from 150 to 2000 µ in grain size, and the liquid used is continually recirculated by a simple airlift.

scholarly journals Contribution of Particles Size Ranges to Sand Friction

2013 ◽  
Vol 3 (4) ◽  
pp. 497-501 ◽  
Author(s):  
E. Mostefa Kara ◽  
M. Meghachou ◽  
N. Aboubekr
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Granular Material ◽  
Physical Properties ◽  
Friction Angle ◽  
Direct Shear ◽  
Shear Tests ◽  
Direct Shear Tests ◽  
Marine Sand

This work studies the correlation between certain physical properties of granular material such as the friction angle and the grain size distribution. In the laboratory, the determination of friction angle requires hard and expensive testing. Prediction of this parameter from the grading curve proves to be very interesting. Direct shear tests were performed on actual marine sand of Tergha (Algeria) and on seventeen different samples arranged from the same sand with various particle size ranges. Results showed that the friction angle of sand is a result of contribution of various constituent granular classes.

Observation of different regimes of grain size effect on plasma emission induced by laser ablating granular material

2021 ◽  
Author(s):  
Yaju Li ◽  
Xiaolong Li ◽  
Songting Li ◽  
Maoji Zhou ◽  
Dongbin Qian ◽  
...  
Keyword(s):  
Grain Size ◽  
Laser Pulse ◽  
Size Effect ◽  
Granular Material ◽  
Plasma Emission ◽  
Grain Size Effect ◽  
Copper Material

The grain size effect on the plasma emission, induced by a 1064 nm laser pulse of 7 ns duration ablating the surface of a randomly packed granular (RPG) copper material...

scholarly journals The variation of grain size distribution in rock granular material in seepage process considering the mechanical–hydrological–chemical coupling effect: an experimental research

2020 ◽  
Vol 7 (1) ◽  
pp. 190590 ◽  
Author(s):  
Hailing Kong ◽  
Luzhen Wang ◽  
Hualei Zhang
Keyword(s):  
Grain Size ◽  
Granular Material ◽  
Size Distribution ◽  
Granular Materials ◽  
Grain Size Distribution ◽  
Coupling Effect ◽  
Water Pressure ◽  
Geotechnical Engineering ◽  
Material Structure ◽  
Filling Material

As a common solid waste in geotechnical engineering, rock granular material should be properly treated and recycled. Rock granular material often coexists with water when it is used as the filling material in geotechnical engineering. Water flowing in rock granular materials is a complex progress with the mechanical–hydrological–chemical (MHC) coupling effect, i.e. the water scours in the gaps and spaces in the rock granular material structure, produces chemical reactions with rock grains, rock grains squeeze each other under the water pressure and compression leading to re-breakage and producing secondary rock grains, and the fine rock grains are migrated with water and rushed out. In this process, rock grain size distribution (GSD) changes, it affects the physical and mechanical characteristics of the rock granular materials, and even influences the seepage stability of the rock granular materials. To study the variation of GSD in the rock granular material considering the MHC coupling effect after the seepage process, seepage experiments of rock grain samples are carried out and analysed in this paper. The result is expected to have a positive impact on further studies of the properties of the rock granular material.

The analysis of relaxed criteria for erosion-control filters

1994 ◽  
Vol 31 (6) ◽  
pp. 829-840 ◽  
Author(s):  
H. Den Adel ◽  
M.A. Koenders ◽  
K.J. Bakker
Keyword(s):  
Mathematical Model ◽  
Grain Size ◽  
Granular Material ◽  
Key Words ◽  
Experimental Work ◽  
Transport Model ◽  
Base Material ◽  
Erosion Control ◽  
Sand Surface ◽  
Moving Base

To optimize the design of erosion-control filters a transport model is presented for moving base material in horizontally loaded filters that are not geometrically stable. Supporting experimental work is used to obtain the parameters in a descriptive quantitative mathematical model. A set of three fixed parameters describes most experiments. Exceptions are where the filter to base grain-size ratio is so small that geometrical obstruction takes place and where this ratio is so large that the turbulences in the flow cause the sand surface under the filter to ripple. The latter case is described with a slightly amended parameter to allow for the amount of fluctuation in the problem. Key words : filtration, transport, experiments, theory, granular material, barriers.

scholarly journals Pore Structure of Grain-Size Fractal Granular Material

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2053 ◽  
Author(s):  
Yifei Liu ◽  
Dong-Sheng Jeng
Keyword(s):  
Grain Size ◽  
Fractal Dimension ◽  
Granular Material ◽  
Pore Structure ◽  
Granular Materials ◽  
General Function ◽  
Fractal Structures ◽  
Experimental Database ◽  
Box Counting Dimension ◽  
Menger Sponge

Numerous studies have proven that natural particle-packed granular materials, such as soil and rock, are consistent with the grain-size fractal rule. The majority of existing studies have regarded these materials as ideal fractal structures, while few have viewed them as particle-packed materials to study the pore structure. In this study, theoretical analysis, the discrete element method, and digital image processing were used to explore the general rules of the pore structures of grain-size fractal granular materials. The relationship between the porosity and grain-size fractal dimension was determined based on bi-dispersed packing and the geometric packing theory. The pore structure of the grain-size fractal granular material was proven to differ from the ideal fractal structure, such as the Menger sponge. The empirical relationships among the box-counting dimension, lacunarity, succolarity, grain-size fractal dimension, and porosity were provided. A new segmentation method for the pore structure was proposed. Moreover, a general function of the pore size distribution was developed based on the segmentation results, which was verified by the soil-water characteristic curves from the experimental database.

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