Difference of water abundance and water inflow of the first mining face in deep coal seams of Mongolia-Shaanxi mining area
Aiming at the unclear hydrogeological conditions and frequent water disasters at border area between Inner Mongolia and Shaanxi,by analyzing the geological and hydrogeological characteristics of the roof of the first mining face of four mines in Hujierte mining area,and the change and difference of water inflow during mining.The results showed that:The water inflow of the first mining face of the four mines gradually increases with the mining of the working face.The maximum water inflow of the first mining face of Hulusu and Bayangol mines are 645.0 m3/h and 494.0 m3/h,respectively,and there are water abundance differences in different areas of Qilizhen sandstone aquifer,resulting in a stepped increase in water inflow with great fluctuation,which is consistent with the characteristics of thin sandstone aquifer and weak water yield in Qilizhen.The maximum water inflow of the first mining face of Menkeqing and Muduchaideng mines were 1372.0 m3/h and 938.0 m3/h,respectively,and the overall water yield of the Qilizhen sandstone aquifer is strong and uniform.The increase of water inflow shows a steady increase trend with small fluctuation,which is consistent with the characteristics of large thickness and strong water yield of Qilizhen sandstone aquifer on the roof of this area.
deep coal seam areaQilizhen sandstonethe first mining facewater inflowadjacent mine