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.

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