The Groundwater Hydrodynamic Field Evolution Of Ningxia Jinfeng Coal Mine First Mining Areairi The Mining Process

Affected by the geological conditions, part of Ningxia coal seamrecovery process due to unloading roof crushed down and cause suddenaquifer water of roof damage is more common, according to t he results ofmost of the coal mines in Ningxia redrawing district hydrogeological typesof statistics, more than80%of the mine Type complicated hydrogeologicalmodel, with coal mining depth increased, coal mining hydrogeologicalconditions will be more complex.Analyze the reasons in recent years, Ningxia mine water damageaccidents, mainly because of past water damage forecasting technology andmethods limitations, groundwater chemistry, groundwater level, such as thelack of continuous dynamic monitoring data, the corresponding coal miningprocess hydrodynamic field and groundwater chemical field evolution failsto identify the need to establish long-term dynamics of groundwater levelsand water chemistry monitoring network, in order to further study t hedynamic evolution of the groundwater. The main contents and results of thisstudy are as follows:1, based on Jinfeng first coal mining region of Ningxia preliminaryresults of a large number of preliminary exploration data, the systemanalyzes the characteristics of the geological conditions and groundwatersystems in the study area, and laid the foundation for the study ofgroundwater quantitative evaluation of the power system;2, based on a large number of borehole data in the study area, thegroundwater system using advanced simulation software GMS established athree-dimensional model of structure formation in the study area, the studyarea for the analysis of spatial seams and aquifers and confining layersstacked relationship, as well as different levels of coal stratigraphic contacttunneling process provided favorable conditions;3, using internationally accepted Visual Modflow software, establisheda numerical model of groundwater flow. By solving the model to analyze thedifferent stages of the study area’s coal mining evolution of groundwaterdynamic field. Research methods and research results of the study area coal mine water prevention laid a good foundation.