Detection Research and Control Evaluation of Seam Roof Water Yield Property in Yulin-Hengshan Southern Mining Area

Coal seam roof water hazard seriously threatens the safe production of many coal mines in northern Shaanxi Province. In this paper, exploration research was carried out on the seam roof water yield property by taking Weiqiang Mine in Yulin-Hengshan Southern Mining Area as an example, and based on the analysis of the hydro-geological conditions of the mine and working faces, it was determined that the water filling source was water from the sandstone fracture aquifer in the Jurassic Yanan-Zhiluo groups, and the water passageway was the water flowing fractured zone, exploration boring was carried out on the seam roof by the combination of the geophysical engineering and drilling engineering, about 20 000 m³ of roof water was effectively drained, meanwhile the analysis was made on the quality characteristics of the roof water, and it was concluded that the water quality was SO₄-Na type. Based on the the geophysical prospecting results, the exploration boring results and the results of water quality analysis, it was determined that the roof water abundant area of 1301 working face of the mine was mainly the the static water and limited dynamic water, the water was drained by boreholes, the roof water had less influence on the safe production of the working face, so the normal coal mining can be conducted.