| Shanxi province has the largest, widely distributed carbonate rocks in thenorthern provinces of our country, also known as a coal-rich province. Alongwith the depth of coal mine pits deepening, the overlying aquifer of coalmeasure strata has been damaging to various degrees, in the consequences thekarst water of coal bearing strata has become the main water-supply industry forthe city and the rural life. For recent years, coal mine drainages have acontinuous impact on the groundwater environment in Hongshan spring region,thus it is very important to strengthen the study of the water environmentalimpact of coal mining in the spring area of Hongshan.This paper takes Pingyao Er Mu Gou of coal mine as an example, havinganalyzed the geological and hydrogeological conditions of Hongshan spring areaand Er Mu Gou coal mine, considered taking the measures of decompressiondrainage measures in No.11coal seam pressure area, selected a part of the subregion in Hongshan spring area as the studying area, which is systematicallybased on the analysis of numerical simulation for the groundwater. Thenumerical simulation methods involve the finite difference method and thethree-dimensional unsteady flow mathematical model. The groundwater systemof the study area is also studied by the numerical simulation.First, in order to study the dynamic changes of groundwater in the studyarea, this paper establishes both hydrogeological conceptual model and mathematical model with the application of Visual MODFLOW, then uses theflow model to predict the impact on the karst groundwater Hong spring bytaking measures of draining karst water in Er Mu Gou coal mine, and also toprovide the basis for the protection of coal mining and Hongshan karsticgroundwater resources, which provides a meaningful reference for the scientificmanagement of groundwater resources. The main research contents:First, field hydrogeological investigation under the background of theproject and Investigation of water the surrounding area of the project in the earlystage are necessary, and collection of the related geological and hydrogeologicaldata.Second, based on the investigation and analysis of the data, this papersummarizes and describes the natural geography, geological andhydrogeological conditions of Er Mu Gou coal mine Ida and Hongshan springstudying field, generalizes hydrogeological characteristics of the study area andthe hydro geological conceptual model of research area. The establishment ofthe research area of heterogeneous3D unsteady flow mathematical model, isnumerically solved by the method of finite difference.Third, according to the actual hydrological geology characteristics ofdiscrete research area, the division of hydrogeological parameters such as thepermeability coefficient of aquifer and the elastic storativity, modelidentification and verification is carried out by using the background projectinvestigation and measured data, so the groundwater numerical model can bedirectly used for the dynamic prediction of groundwater in the study area.Lastly, Er Mu Gou coal mine pit of No.11coal seam has taken themeasures of draining the Ordovician karst water on the pressure zone, using theflow model above to predict the effects on the dynamic changes of Karstgroundwater in the study area: between0.06and0.07MPa/m water inrushcoefficient in Er Mu Gou coal mine in the East Central sections, setting1hydrophobic well for depressurization. After buck hydrophobic100D, the well will become a water-descending funnel with a draining well as the center, thedescending water level in the center of the funnel is about32m, the influentialarea is about5.34km2ï¼›After buck hydrophobic150D, the descending water inthe center of the funnel is about54m, the influential area is about13.29km2.With the analysis of the relatively predicting results, the paper puts forwardsome suggestions and measures to protect the karst water. |
PDF Full Text Request