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In Situ Characteristics of Fine Coal Refuse
A field exploration study was performed on an inactive coal refuse impoundment in the Appalachian region (USA) to investigate in situ characteristics of fine coal refuse (FCR). A series of standard penetration tests (SPT) were conducted from the crest of the impoundment and relatively undisturbed Shelby tube samples were obtained from various depths within the impoundment to a depth of about 60 meters (m). The SPT blow counts (N60-values) in the FCR ranged from 7 to 15 blows per foot suggesting medium to stiff material consistency. The split-spoon samples revealed intermittent layering over short intervals, with thin layers of coarser FCR separated by layers of the finer very soft FCR. Particle size analyses identified two groupings of material, a “sandy” FCR and a “silty” FCR, with no apparent trend with depth. Index testing identified a few locations where the liquidity index was greater than one. It appears thin layers of coarser FCR material produce blow counts that obscure the presence of the soft layers of FCR. This suggests the SPT is not an effective means to investigate these slurry placed materials, if the intent is to identify flowable, under-consolidated materials.
In Situ Characteristics of Fine Coal Refuse
A field exploration study was performed on an inactive coal refuse impoundment in the Appalachian region (USA) to investigate in situ characteristics of fine coal refuse (FCR). A series of standard penetration tests (SPT) were conducted from the crest of the impoundment and relatively undisturbed Shelby tube samples were obtained from various depths within the impoundment to a depth of about 60 meters (m). The SPT blow counts (N60-values) in the FCR ranged from 7 to 15 blows per foot suggesting medium to stiff material consistency. The split-spoon samples revealed intermittent layering over short intervals, with thin layers of coarser FCR separated by layers of the finer very soft FCR. Particle size analyses identified two groupings of material, a “sandy” FCR and a “silty” FCR, with no apparent trend with depth. Index testing identified a few locations where the liquidity index was greater than one. It appears thin layers of coarser FCR material produce blow counts that obscure the presence of the soft layers of FCR. This suggests the SPT is not an effective means to investigate these slurry placed materials, if the intent is to identify flowable, under-consolidated materials.
In Situ Characteristics of Fine Coal Refuse
Jedari, Cyrus (author) / Palomino, Angelica M. (author) / Drumm, Eric C. (author) / Boles, Daniel R. (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 13-20
2019-03-21
Conference paper
Electronic Resource
English
In Situ Characteristics of Fine Coal Refuse
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