Coal Mine Bumps: Detection, Evaluation, and Control.
Rowell-GA; Haramy-KY; Kripakov-NP; Wilson-PE
24th Int'l Conf Safety in Mines Research Insts Makeevka State Research Inst Ussr Pp429-38 :10 pages
Coal mine bumps are a major hazard in deep, underground coal mines. To control bump occurrences, the U.S. Bureau of Mines is developing methods for improving mine design. To forecast mountain bumps, the Bureau is developing systems for ground stability monitoring. Rapidly changing mining conditions, especially in high-production longwall mines, have necessitated the development of real-time stress and microseismic monitoring technology to analyze changing stress conditions so that bumps can be forecasted during active mining. This paper presents preliminary results from an automated microseismic system being tested in a longwall coal mine experiencing bumps. Analysis indicates that an anomalously high average microseismic energy per event started a few hours before and continued for several hours after two catastrophic bumps. If this type of anomaly is consistently present, there will be sufficient warning to move personnel and equipment away from hazardous areas. It is hoped that the combination of improved mine design and bump- forecasting technology will help solve the problem of safely mining through bump-prone coal.
24th Int'l. Conf. Safety in Mines Research Insts. Makeevka State Research Inst., Ussr, Pp429-38