Prediction of Mine Water Inflow at Different Periods in Balasu Coal Field of Northern Yuheng Mining Area

Abstract

In order to accurately predict the water inflow of different periods in northern Yuheng Mining Area, taking No.2 coal seam of the first mining area of Balasu Mine Field as an example, firstly, the height of water-conducting fissure zone and the affected main aquifer are determined; after that, five methods are used to predict the water inflow at different working periods of the mine; finally, a relatively scientific and reasonable methods and results are chosen. The results show that, the main water source of roadway during mine construction period is No.2 coal seam fracture water. In the mine production period, the fracture zone height of about 107 m is calculated by using 28 times of fracture mining ratio, which affected the aquifers of Yan’an formation and Zhilao formation. The five methods adopted to predict the mine normal water inflow at different working periods of mine construction, production and 2101 first mining face are as follows: 1 032 m3/h, 1 865 m3/h, 348 m3/h. By comparing and analyzing, it is determined that the prediction method in construction period is the gallery method, the prediction method in production period is large-diameter well method + numerical method, and the prediction method in 2101 first mining face is dynamic and static combination method.

Keywords

• northern yuheng mining area
• balasu coal field
• pre-exploitation mining area
• mine water inflow
• prediction method