Method of division and engineering use of “three band”in the stope again

This paper does a research on covering the shortage of method for determining the water flowing fractured zone,it investigated the method ofthree-zonepartition for overburden strata. The author used the methods including the similar simulations,theoretical analysis and field verification. At the initial stage,the theoretical analysis and analogue simulation found that caving height,caving space,coefficient of residual bulk,distance between key rock strata and coal seam,and the features of key rock strata affect the distribution of three-zonepartition for overburden strata. Based on the initial stage results,a new method for three-zonepartition and its application conditions were proposed. Finally,a case study at the coal working face 7130,6130,and 7121 in Qidong Coal Mine,and the working face41301 in Bulianta Coal Mine and the working face 6206 in Lu'an Coal Mine were conducted to verify the proposed method. Results show that the proposed method is more objective than existing methods.