Study On Optimization Of Groundwater Drainage Plan And Utilization Of Drainage Water In Wulin Oil Shale Mine

In our country, oil shale reserves of mineral resources is huge, under the condition of the deposit, some of them adopt open pit mining technology. Open pit mining is affected significantly by the climate, especially the atmospheric precipitation, mine water bursting problem will seriously affect the personnel and property safety, so drainage problems in open oil shale mining is very important. With the development of mine drainage, the relationship between supply and discharge of groundwater system has changed, and the original design of drainage system has been unable to meet the requirements of mining in the mining area. So it is necessary to optimize the drainage scheme of open pit mine drainage. The main contents of this study are:Based on the analysis of topography, geomorphology, hydrology and meteorology and hydro geological conditions of Wulin oil shale, I summarized aquifer, aquitard, lithologic characteristics of oil shale and distribution, balancing elements of groundwater. Based on the drilling data and the research area, the three-dimensional geological model of the study area was established by using the Solid module of GMS software; According to the boundary conditions and recharge and discharge characteristics, groundwater can be generalized as anisotropic heterogeneous groundwater flow system, and a conceptual model of the study area is established; The groundwater numerical model is established based on the conceptual model. The model is solved by the finite difference method, and the numerical model is identified and tested. The absolute error of the water level of the model is less than 88% of the known water level node, which can accurately reflect the groundwater system, and the model is more reasonable.According to the numerical model, four kinds of groundwater dewatering optimization were designed, and the operating conditions of 4 kinds of groundwater drainage optimization schemes are simulated by using the constructed model. According to the simulation results, the drainage effect is evaluated from the aspects of total drainage, drainage area, water level drawdown and the influence of the surrounding groundwater level. The results showed that four kinds of mining optimization scheme can meet the following job requirements.Based on the monitoring of groundwater in the mining area, the water quality of the drainage water is analyzed, and the water quality was evaluated by the comprehensive evaluation method. The results show that the pollutants were mainly iron, manganese, fluorine, ammonia, nitrite nitrogen, treated to reach the groundwater quality standard level III can be used as centralized drinking water. The ways of resource utilization of water drainage were analyzed.