Abstract:

During the process of top slicing under coal seam group,the goaf made by up coal seam exploited inexorablely has a great influence on law of strata behaviors of down coal seam working face in its stoping when the distance between coal seams is very close.Figuring out the law of strata behaviors of closer coal seam working face under goaf in its stoping has a important guiding significance to similar mines in equipment selection and safety,efficient production.Comparing the law of strata behaviors under goaf with that no goaf during working face stoping by analyzing the strata behaviors data of N1200 face in Shenmu Ningtiaota Coal Mining Company Ltd, Shaanxi Coal Mining Group， this paper shows the law of strata behaviors in different normal faces that the weighting strength is bigger under goaf,big and small periodic appears alternately and the strength appears suddenly.On this basis, the paper explains the generating mechanism of the law of strata behaviors in working face under goaf using relevant theories of mine pressure and strata control.

Key words: coal seam mining, close distance coal seams, goaf, strata behaviors