Abstract
In collaboration with the US Department of Energy, the Mining Engineering Department of Southern Illinois University at Carbondale has developed underground paste backfilling technology for controlling surface subsidence. In the Summer of 1996, approximately 8,000 tons of high density coal combustion by-products based pastes (>70% solids) were blind backfilled underground through a surface bore hole to fill a room-and-pillar panel at Peabody No. 10 mine. Observations through a borehole camera confirmed that the grout must have moved at least 200 ft from the injection point. Cores obtained from the placed materials indicated strength and stiffness in the range of 500--600 psi and 30,000--35,000 psi, respectively, after 60 days.
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