Mining-induced off-layer space evolution law and gangue grouting filling control mechanism

Yao, Yinan; Yan, Hao; Chen, Jinyu; Xu, Jianfei

doi:10.1007/s10064-023-03489-6

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…The particle size must meet the requirements before the slurry can be made. Currently, the most commonly used gangue slurry particle sizes are less than 0.15 mm [3,10,12]. The stability of large-particle-size gangue slurry pipeline transport needs to be further analyzed.…”

Section: Granular Domain Settingsmentioning

confidence: 99%

“…Coal gangue is the discarded coal-containing rocks in coal production, and its most conventional treatment is accumulation on the ground [1][2][3]. The total storage capacity of coal gangue in China has exceeded 7 billion tons, and accumulating a large amount of coal gangue will bring severe environmental problems while occupying land resources [1,[4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of Gangue Slurry Deposition Behavior in Pipelines Considering Viscosity Change

Gu,

Wang,

et al. 2024

Minerals

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Pipeline conveying is a crucial method for realizing gangue slurry filling. In order to avoid the blockage of gangue slurry in pipeline conveying, it is necessary to clarify the deposition behavior of gangue particles in the pipeline. This paper analyzes coal gangue’s microstructure and mineral composition in the Zhaozhuang No. 2 coal mine through electron microscope scanning and X-ray diffraction tests. We studied the viscosity characteristics of gangue slurry at different mass concentrations and particle sizes and analyzed the change rule of viscosity of gangue slurry with time. Based on determining the nature of the slurry material, a simulation analysis of the deposition behavior of the gangue slurry in a pipeline was carried out using the coupled fluid dynamics–discrete element (CFD-DEM) method. The results show that gangue slurry with a particle size larger than 1.0 mm is likely to lead to the blockage of the pipeline. A small increase in viscosity will promote a uniform distribution of particles inside the pipeline. The deposition behavior of particles is jointly influenced by gravity, fluid interaction force, inter-particle force, and the interaction between particles and the pipeline surface. The research results can be used as a reference for the design and study of gangue slurry grouting systems.

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Section: Granular Domain Settingsmentioning

confidence: 99%