A topological view on microscopic structural evolution for granular material under loading and unloading path

Lin, Mingchun; Zhou, Wei; Liu, Jiaying; Ma, Gang; Cao, Xuexing

doi:10.1016/j.compgeo.2021.104530

Cited by 11 publications

(1 citation statement)

References 74 publications

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“…They also derived the temporal and spatial evolution patterns of the effective storage coefficient through the vertical displacement trajectory curves of the subdivided overburdens of the underground reservoir. Additionally, the results of basic experiments and numerical simulation studies on packing density [19], local order degree [20], bridge structure [21], topological structure [22], porosity structure fraction [23] and non-spherical particle packing [24] were published, exploring the intrinsic nonuniformity of particle packing systems from different perspectives.…”

Section: Introductionmentioning

confidence: 99%

Spatial Structure Characteristics of Underground Reservoir Water Storage Space in Coal Mines Considering Shape Characteristics of Crushed Rock

Qin,

Cao,

Wei

et al. 2023

Processes

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In order to investigate the impact of a crushed rock shape on the storage coefficient of underground reservoirs in coal mines, statistical analysis of the shape characteristics of crushed rocks was conducted, which was followed by numerical packing tests using the rigid block model. These tests aimed to investigate the spatial structure characteristics of underground reservoir water storage space in coal mines under the influence of different shapes of crushed rock. The results demonstrated the following: (1) Crushed rock exhibits a lognormal distribution in its shape characteristic parameters at different scales with a predominant discoid shape. The shape coefficient M can be utilized as a comprehensive indicator to characterize the shape characteristics of crushed rock. (2) The average storage coefficient of crushed rock increases exponentially as the shape coefficient M increases. There is a 50.1% increase in the storage coefficient from M = 1 to 3.5. (3) The spatial structure of the water storage space exhibits self-similarity, and both the void fractal dimension and the void boundary fractal dimension increase with an increase in the shape coefficient M. (4) When comparing the non-spherical particle system with the spherical particle system, it is observed that the spherical particle system has smaller water storage space, lower connectivity among voids, and more irregular void space. In the non-spherical particle system, the water storage space becomes larger as the shape of crushed rock becomes more irregular, resulting in more irregular void space. However, there is no significant effect on void connectivity.

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