Potential use of high-density backfill in Illinois Basin room-and-pillar coal mines
MetadataShow full item record
The use of paste backfill in room-and-pillar coal mines in the United States needs to be fully investigated. This paper discusses a series of physical tests that were conducted to examine the support benefits of theoretical paste backfill regimens in Illinois Basin room-and-pillar coal mines, which necessarily included consideration of weak floor conditions. The series of tests included those simulating strong floor conditions, weak floor conditions, under-confined scenarios, and testing of actual coal-based paste backfill samples. The testing indicated that a paste backfill regimen utilizing a minimum backfill strength of 22 psi at a minimum fill height of 50% of pillar height could significantly increase the longterm stability of coal pillars in the Illinois Basin. Considering typical coal wash plant recoveries, 50% fill would be feasible.
Showing items related by title, author, creator and subject.
Influence of backfill on coal pillar strength and floor bearing capacity in weak floor conditions in the Illinois BasinKostecki, T.; Spearing, Sam (2015)This paper discusses the current theoretical design equations associated with foundation design in the Illinois Basin, as well as the benefits of utilizing high density backfill in a numerical model, to improve pillar and ...
Effects of solid backfilling on overburden strata movement in shallow depth longwall coal mines in West ChinaSpearing, A.; Huang, P.; Spearing, Sam; Feng, J.; Jessu, K.; Guo, S. (2018)© 2018 Sinopec Geophysical Research Institute. Overburden strata movement can create problems in longwall coal mines at shallow depths located in the West of China, due to surface subsidence affecting the surface structures ...
Zhang, J.; Zhang, Q.; Spearing, Sam; Miao, X.; Guo, S.; Sun, Q. (2016)Aiming to address the following major engineering issues faced by the Pingdingshan No. 12 mine: (1) difficulty in implementing auxiliary lifting because of its depth (i.e., beyond 1000m); (2) highly gassy main coal seam ...