Field Test of Chemical Injection for Stabilizing Coal Mine Roof.
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A field test was designed to inject a specially formulated two- compound epoxy resin into the roof rock ahead of a working face to cement fractures and formation interfaces at the Westmoreland Coal Company's No. 5 mine, Eccles, West Virginia. Five 30-foot-long by 2-inch- diameter holes were drilled at a 10 deg. Angle above the plane of roof line from the face of a working entry. The epoxy resin compounds were pumped through a proportioning unit and mixed in-line before being discharged into the drill hole at injection pressures up to a maximum of 450 psig. When the coal face was advanced, an anomolus failure of roof rock occurred in the treated section. Further testing was suspended until the cause of the failure could be determined. The polymers were tested under confined conditions in 2-inch pipe columns. Extreme temperature and pressure up to 2,400 psig rises were recorded as they cured. It was concluded that this pressure source fractured the rock and caused the roof failure. The entire program was terminated after it was determined that the heat rise and resultant high pressures could not be controlled chemically or mechanically.
CP; Final Contract Report;
For Reference Only At Bureau Libraries
McCarthy Eng. & Cons., Inc.