Influence of Mining Parameters on the Distribution Law of Separation Layer and Water-Flowing Fracture in Mining Overburden

The internal overburden movement after coal mining may cause many disasters to the on-site production. It is of great guiding significance for engineering treatment such as separation layer grouting and gas extraction master evolution law fracture in overburden. Combined with full-columnar a certain working face, this study established number models using 3DEC simulation software analyzed influence different heights widths on distribution strata movement. results show that roughly consists three stages, namely, initial generation, reaching peak, tending close (stable). development positively correlated height negatively width. When increases from 3 m 5 m, peak value cumulative 0.7 2.1 m. On contrary, when width 250 350 decreases 2.8 1.1 pre-bearing stress concentration will be formed process face. change greater than change, subsidence mainly affected by height. A quantitative analysis method water-flowing was developed penetration joint shear displacement. calculated zone 117.33 good agreement actual measured 120 verifying validity method. These findings are reference mastering