The Law of Fracture Evolution of Overlying Strata and Gas Emission in Goaf under the Influence of Mining

Mining is associated with poor safety due to pressure relief gas emission from the goaf during production period. The aim of this study was explore a case Wangjialing coal mine 12322 working face in Shanxi, China, through physical simulation and field observation. characterized by overlying strata fracture process mining. A mathematical model source migration finite element COMSOL software were used simulate law region fissures under influence results distribution goaf. Rational parameters high-level directional long borehole for extraction designed based on experimental results. showed that development affected In addition, “trapezoid platform structure” formed after areas are connected. maximum height stope caving zone between 26.8 m 28.1 m, approximately 110 m. concentration exhibited saddle-shaped cut surface direction strike. Furthermore, an overall upward trend intake airflow roadway return gradually decreased reaching maximum. vertical direction, increased increase layer, position highest point shifted roadway. Construction high After steady stable extraction, upper corner 0.49%, 0.34%. findings provide information evolution These basis reducing overlimit or airway corner, thus improving capacity mine.