Coal bursts in the deep longwall mines of the united state
Coal bursts involve the sudden, violent ejection of coal or rock into the mine workings.They are a particular hazard because they typically occur without warning.During the past two years three US coal miners were killed in two coal bursts,following a six-year period during which there were zero burst fatalities.This paper puts the US experience in the context of worldwide research into coal bursts.It focusses on two major longwall mining coalfields which have struggled with bursts for decades.The Utah experience displays many of the classic burst characteristics, including deep cover, strong roof and floor rock, and a direct association between bursts and mining activity.In Colorado, the longwalls of the North Fork Valley (NFV) also work at great depth, but their roof and floor strengths are moderate, and most bursts have occurred during entry development or in headgates, bleeders, or other outby locations.The NFV bursts also are more likely to be associated with geologic structures and large magnitude seismic events.The paper closes with a brief discussion of how US longwalls have managed the burst risk.
Christopher Mark
U.S.Mine Safety and Health Administration, Pittsburgh, PA, USA
国际会议
The 34th International Conference on Ground Control in Mining (ICGCM) 2015(34届国际采矿岩层控制会议)
焦作
英文
3-9
2015-10-17（万方平台首次上网日期，不代表论文的发表时间）