The calculation methods for underground pre-treatment including the calculation method for the number of probing and drainage holes and the hydraulics method are put forward based on th.

Influence of local energy loss at junctions on hydraulic calculation of pipeline network;

According to the water-transmission accident in a coal mine of Jinzhong City,Shanxi Province,and the working experiences in the recent years,this paper points out the key point of the current prevention of the mine water in Shanxi Province is strengthening the water detection and water release in the mine.

Through the generalizing the practice of the water detection and water release on the stopes,this paper puts forward some concrete operating methods and some matters needing attention in the operation,which possess certain guiding function in tomorrow's underground water detection and water release and the safety in production of the coalmines.

This paper also provided the experience in preventing the goaf water by adapting water detection and water release concentratedly,and by using sleeve to control water release.