关键词: 重复采动, 地表移动, 关键层, 导水裂缝带

Abstract: Based on the rock movement data of two coal mines in the TengNan area, height observation data of water flowing fractured zone and borehole data of the working face, the paper analyses the relationship between the surface movement rule and the key strata under upper and lower No.3 coal seams situation. According to the analysis of key strata and the comparative study on the regularity rule of surface movement depend on the key strata buckling or not under repeating mining condition, adding verification of overburden rock damage by observing water flowing fractured zone height under different repeated mining conditions , the paper put forward that the change of repeating mining at short range will impact the regularity of surface movement. The results showed that surface movement won’t have significant change when repeating mining doesn’t destroy the key strata. 0therwise, surface movement will get intensified.