Strata Movement of Overburden-Separation Grouting Working Face and Its Influence on Gas Emission during Mining

Due to its excellent effect of surface subsidence reduction, the overburden-separation grouting (OSG) technology has been widely applied green mining. However, OSG changes mine pressure, and resultant gas emission in stope remains unclear. Therefore, with 22301 working face Tunlan Coal Mine as an example, overburden deformation stress distribution absence presence were studied through numerical simulation on-site tests. Furthermore, law was contrastingly analyzed. The following results obtained. With rise pressure (GP), strata above separation layer decreases while that below increases; heave displacement floor coal seam gradually decreases. significantly geometric shape range relief zone. As GP rises, enrichment area moves downward continuously shrinks spatially. Horizontally, ranges zone free space goaf shrink, compaction degree grow. After OSG, total amount falls by 52.2%.