Multi-source spatial information fusion-based water abundance zoning of the composite layer of water-bearing seam roof

Coal mining in Jurassic coalfield is generally threatened by roof water. The composite sandstone of No.2 coal seam in Yuandatan coal mine located at North Shaanxi was selected as research object, and the development height of water-conducting fracture zone was calculated using the empirical formula and measurement formula respectively, based on the calculated results, it was determined that the range for water abundance zoning was from the No.2 coal seam to the top boundary of Zhiluo Formation. According to the previous studies, we selected seven factors such as the equivalent thickness of sandstone, the property of interbed of sandstone and mudstone, the water content of the No.2 coal seam, the unit water inflow, the permeability coefficient, the core-recovery, and the thickness ratio of brittle and plastic rock to calculate the comprehensive water abundance index at borehole location. The zoning plan of water abundance in the study area was generated using the Arcgis software, and the plan indicated that the water abundance decreased gradually from the northwest to the southeast and was consistent with the regional background value. The research results have positive effect for the application of the water abundance in-dex method in the conditions of water-bearing coal seam.