Research on safe mining technology for shallow buried coal seam under the goaf water in northern Shaanxi Province

Goaf water above shallow coal seams is threatening the safe production in many coal mines in north Shaanxi Province. The paper, taking a mine in north Shaanxi Province as an example, aiming at such kind of water hazards, through using empirical formula, numerical simulation,conducted analysis, calculated that the water-conducting height in the overlying rock due to mining seam 3^-1 was at least 66 m. Using analogy method and empirical formula, it was predicted that the normal mine inflow was 163 m³/h, the maximum mine inflow 203 m³/h, the accumulated goaf water above seam 3^-1 about 2.6×10⁶ m³. According to the calculation results, the technical scheme and idea for safe mining were put forward, that is, geophysical prospecting goes first, drilling verifies the drainage, control is followed by mining, detection must be carried out before any excavation, laying the foundation for formulating effective and reasonable comprehensive control measures of goal water in the roof of seam.