| The6coal seam of Coal mine Daihe is seriously eroded by magmatic rocks with most parts of the thinner seams, resulting in a large area of the6coal seam not mining. At present,6coal seam, only in the â…¢61Mining District, have mining value. Based on the above facts, to study the mining area is the key of this article.In this paper, hydrogeological characteristics of the6coal seam in the mining region are mainly researched, and the corresponding water control measures are put forward. Firstly, the geology of floor limestone and hydrogeological characteristics which in the mine and â…¢61Mining District are analyzed, the conclusion, which the mine with the Huaibei Shuanglong Mining company, the Suli mine and the Shitai mine belongs to a syncline storage structure. All of the groundwater belongs to a relatively closed hydrogeological unit, rich water is weaker and the mining district does not have the geological conditions to form larger water flowing subsided column. Major aquifer data of water quality analysis are collection and collation chemistry indicators, characteristics ion and characteristic components are determined, by collecting and sorting the water quality analysis data of each aquifers in the mine. On this basis, hydrochemical analysis of major aquifer is conducted, using hydrochemical software, and the Mine Inflow Source determination mode is eventual established.Then, failure depth of coal seam floor, which under the mining influence, is calculated and predicted using FLAC3D finite element numerical simulation, the gray BP neural network as well as the theoretical formula. There are similar prediction results of the three methods, for safety reasons, selecting a maximum15.21m to floor failure depth. Using Fractal Geometry to study impervious bed rock structure type of6coal in the â…¢61Mining District, combined impervious bed thickness and lithologic characteristics of the â…¢61Mining District, the study area impermeable better performance is came to. Floor mining boundary faults and floor underling small faults in mining model are conducted, using the FLAC simulation software and the theory of fluid-structure interaction. Fault mining activation is systematically simulated, as well as the whole process of stopping water inrush which resulted from conduction of the fault activation lately with the limestone aquifer. Using floor water inrush coefficient theory and gray fuzzy, to comprehensive evaluate these two methods,6coal seam floor limestone water inrush of the â…¢61Mining District more likely in confined water in "overrun mining" state are analyzed drawn. Floor water prevention work should be strengthened while stopping the6coal seam. At last, specific programs of prevention and treatment of water are proposed based on the research results, to provide the basis for safety and efficiency mining of the6coal seam. |
