Study on strata behavior regularity of step soft seam fully mechanized coal face

On the basis of analysis and comparison of the strata behavior of the fully mechanized slicing mining and sub-level caving workface,it has illustrated the load of props and strata behavior regularity of the Step Soft Seam fully mechanized caving workface by slicing mining and sub-level caving of the Ⅵ 15-17 coal seam of the Thirteen Coal Mine of Pingdingshan Coal Industry Group.The study is of great importance to strengthen controlling of fully mechanized caving mining workface and extending technique of fully mechanized caving mining.