Discussion on lower coal group's mining condition above aquifer in Sihe coalfield, Jincheng.

Taking Sihe Mine for background, according to additional hydrogeological exploration, the water resistance properties study about Fengfeng Group was done to prove the existence of relative aquifuge. At last, numerical simulation by FLAC3D was done when relative aquifuge exists to prove that the mining condition in deep part resource with water pressure gets clear improvement. So one of the key factors to do research in this condition is to find out whether the top part of Ordovician gets enough water resistance. [ABSTRACT FROM AUTHOR]