Abstract: Through the theoretical analysis, developing height of water flowing fractured zone after up and down two groups of coal mining and theoretical failure form estimation were obtained. Combined computer numerical simulation and similar material simulation at laboratory, overlying strata damage law, roof and floor stress distribution law and overlying strata settlement law after up and down two groups of coal mining were studied, and the maximum value of water flowing fractured zone was obtained. Overlying strata damage height after down coal seam mining was simulated, and the simulative height of water flowing fractured zone was obtained. These simulated results were compared with the corresponding theoretical value. Damage and movement law of overlying strata after group ascending mining was analyzed synthetically.

Key words: Coal seam group, Ascending mining, Similar material simulation, Numerical simulation