The effects of coal gangue and fly ash on the hydraulic properties and water content distribution in reconstructed soil profiles of coal-mined land with a high groundwater table

Wang, Jinman, Li, Xinfeng, Bai, Zhongke and Huang, Longbin (2017) The effects of coal gangue and fly ash on the hydraulic properties and water content distribution in reconstructed soil profiles of coal-mined land with a high groundwater table. Hydrological Processes, 31 3: 687-697. doi:10.1002/hyp.11065


Author Wang, Jinman
Li, Xinfeng
Bai, Zhongke
Huang, Longbin
Title The effects of coal gangue and fly ash on the hydraulic properties and water content distribution in reconstructed soil profiles of coal-mined land with a high groundwater table
Journal name Hydrological Processes   Check publisher's open access policy
ISSN 1099-1085
0885-6087
Publication date 2017-01-30
Year available 2016
Sub-type Article (original research)
DOI 10.1002/hyp.11065
Open Access Status Not yet assessed
Volume 31
Issue 3
Start page 687
End page 697
Total pages 11
Place of publication Chichester, West Sussex, United Kingdom
Publisher John Wiley & Sons
Language eng
Subject 2312 Water Science and Technology
Abstract Soil water systems have been severely degraded in coal-mined and subsiding land, where a shallow groundwater table is also present. The present paper discussed the effects of fly ash (FA) and coal gangue (CG) as filling materials on the hydraulic properties and water content distribution in a profile for the purpose of rehabilitating subsided lands. The saturated water content, water characteristic curve, and water diffusivity of local soil, FA, CG, and a mixture of FA and CG (“mixed filling”) were characterized. A column experiment was conducted to investigate the changes of water content in profiles reconstructed from the combination of soil and filling materials, including soil only, FA, CG, and a mixture of FA and CG, which were used to fill the lower part of the reconstructed profile. The mixture of FA and CG was found to possess similar hydraulic properties to those of the soil, particularly high water-holding capacity and permeability. Moreover, the volumetric water contents in the whole profile containing the mixture of FA and CG were consistent with those of the profile reconstructed with soil only. As a result, it is recommended to adopt the mixture of FA and CG for reconstructing the lower profile of the land to alleviate or rehabilitate subsided land in coal mines.
Keyword Coal gangue
Fly ash
Land rehabilitation
Land subsidence
Soil water content
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 41271528
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Sustainable Minerals Institute Publications
 
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