关键词: 岩层移动, 蹬空开采, “三带”高度, 台阶下沉

Abstract: Aiming at the problems of mining above hollow to 3#coal seam in Haitian Coal Mine, ”three -zone” method, surrounding rock equilibrium method etc are used to demonstrate the feasibility of mining above hollow to 3#coal seam, except that water drilling segment , drilled peep and FLAC3D numerical simulation method are used to research the behavior of 3#coal seam and overburden after mining of the overlying coal seam. The results from all the methods show that the 3# coal seam and roof rock strata are not destroyed by the occurrence of severe damage, but the internal damage and don’t present sidestep sinks which affects the normal mining of 3# coal. The height of caving zone is 2 ~ 4m above the roof of 9# coal seam , and the height of the fracture zone is 19 ~ 27m, which is less than the theoretical calculation. The 3# coal is in the curve subsidence zone of the 9# and 15# coal. The results show that mining above hollow is feasible.