南大タ張炭鉱における骨格構造の改善

抄録

Thirteen years have passed since Minami Oyubari Coal Mine began its production. The conspicuous character of the mine is unfavorable geological condition which causes gas and geopressure problems. Gas and geopressure problems are the both sides of a coin. Advancing underground road excavation is inevitable and effective to solve gas problem, but used to encounter geopressure problem.
Actually, advancing road excavation and retreaving longwall system have been adopted as the means to settle the gas problem in this mine. Recent tendency of activating area into deeper places forces us to turn our certain energy to maintainance work for underground road. Maintainance of underground road is the one of the most important subjects. We examined and studied all possible ways to keep underground road as it was. As the result, underground road condition is drastically improved and man power engaged in maintainance work steadily reduced.