scholarly journals Influence of Grain Size Distribution on Critical State of Granular Materials

2013 ◽  
pp. 207-210 ◽  
Author(s):  
Gang Li ◽  
Carlos Ovalle ◽  
Christophe Dano ◽  
Pierre-Yves Hicher
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Granular Materials ◽  
Grain Size Distribution ◽  
Critical State

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.

Particle Breakage of Gypsum Granular Materials in Triaxial Compression Tests

2011 ◽  
Vol 374-377 ◽  
pp. 2261-2264 ◽  
Author(s):  
Jian Wei Zhang ◽  
Chen Wang ◽  
Qi Wen Zheng
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Granular Materials ◽  
Grain Size Distribution ◽  
Triaxial Compression ◽  
Particle Breakage ◽  
Primary Study ◽  
Compression Tests ◽  
Confining Pressures ◽  
Triaxial Compression Tests

In order to study the particle breakage of granular materials during compression, a series of triaxial compression tests were conducted for gypsum granular materials. Meanwhile, the primary study on evolution laws of particle breakage was carried out. It was found that the deviator stress increases with the increase in confining pressures for gypsum granular materials at the same axial strain. The degree of particle breakage of gypsum granular materials increases with the increase in confining pressures. The relative breakage index can be adopted to denote the particle breakage degree and increases with the increase in confining pressures. When the initial grain size distribution of gypsum granular materials is fractal, the grain size distribution complies with fractal during compression under different confining pressures. The fractal dimension increases with the increase in confining pressures and can be adopted as a parameter for measuring the degree of particle breakage.

scholarly journals An updated skeleton void ratio for gravelly sand mixtures considering the effect of grain size distribution

2021 ◽  
Author(s):  
Tao Wang ◽  
Sihong Liu ◽  
Antoine Wautier ◽  
François Nicot
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Critical State ◽  
Void Ratio ◽  
Triaxial Tests ◽  
Empirical Equations ◽  
Test Results ◽  
Density State ◽  
Semi Empirical

Recent researches on the behavior of gravelly sands advocate for the use of skeleton void ratio to characterize their density state. Skeleton void ratio corresponds to the void ratio of grains constituting the stress-bearing skeleton. However, such a void ratio relies on parameters difficult to determine in practice, such as the fraction of fine grains that take part actively in the load bearing skeleton. Also, it fails to consider the effect of Grain Size Distribution (GSD) of gravel and sand grains. Therefore, the skeleton void ratio index introduced by Chang et al (2015) is revisited to account for the effect of GSD of both gravel and sand grains. Two semi-empirical equations are developed in this paper to connect GSD parameters with skeleton void ratio parameters. The validity of the proposed equations has been checked for a particular class of gravelly sand materials. A series of specially-designed drained triaxial tests on gravelly sands were then conducted. Test results show that it is essential to consider the effect of GSD when using skeleton void ratio index. It also verifies the effectiveness and applicability of the proposed updated skeleton void ratio, which shows advantages in characterizing critical state lines of gravelly sands.

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