| Popis: |
According to the special form of water occurrence and migration in No.2 coal seam of Balasu Coal Mine in northern Yuheng Mining Area of Jurassic Coal Field in northern Shaanxi province, through theoretical analysis, calculation and prediction, simulation experiment and other methods, the water resources volume, water-rich zoning and mine water inflow are studied, and the water characteristics of No.2 coal seam water in the study area are preliminarily explored. According to the five main control indexes of coal seam thickness, coal core extraction rate, coal seam porosity, seam roof aquifer thickness and bottom water-insulating layer thickness affecting the water-rich coal seam, ArcGIS software and analytic hierarchy process (AHP) were combined to make water-rich prediction zoning for the No.2 coal seam in the study area. The water inflow of underground driving (including shaft, roadway) and stoping face under different working conditions is predicted. The results show that the estimated hydrostatic reserves of No.2 coal seam in the study area are about 0.665 billion m3, the dynamic recharge water is about 362 m3/h, and the coal seam water shows an overall decaying trend. The water-rich zone of No.2 coal seam is divided into 5 types: relatively strong, strong, medium, weak and weak. |
