Numerical Simulation Research On Groundwater Of Coal Mining Of Shuozhou Pinglu District Daheng Coal Industry Group Co.,Ltd

In order to optimize the coal industry structure in Shanxi Province, to prepare for the economic restructuring, mergers and acquisitions integration of coal enterprises have been come true in Shanxi Province constantly. With the continued exploitation of coal mine, ecological and environmental problems have also emerged out, among which the groundwater resources damage is the first to be affected, and get growing concern. Shanxi mineable coal beds are mainly occurred in the Taiyuan group of Carboniferous and Shanxi group of Permian strata. Coal and water co-exist with each other. After coal mining, the fractured zone will inevitably damage Taiyuan group and Shanxi coal measures aquifer and overlying aquifer. So it is particularly important to protect the groundwater aquifer at present.Shanxi Pinglu District Shuozhou Daheng coal mine is located in the Jing Ping Town, Pinglu District, Shuozhou. It exploits4,9and11coal seam, and coal measure strata is mixed up with Permian Shanxi formation and the Carboniferous Taiyuan group. In this paper, against the background of Daheng coal mining, the influence degree of regional groundwater is researched by using Visual Modflow simulation software. According to the height of water flowing fractured zone, it makes Permian Xiashihezi,Shanxi formation sandstone aquifer and Taiyuan formation aquifer conceptualized as a model of the target aquifer. Hydrogeologic parameters is imported which is collected by field investigation and test into the software to simulate the two dimensional unsteady flow model. The model of three periods (5a,14.4a,28.8a) predicts the water level change of the target aquifer after these three periods. Second, simulates the impact of industrial sites and gangue field on groundwater by MT3D to determine the scope and extentof the impact of water quality, which provides a scientific basis for regional drinking water safety.The simulation results show:1. With the coal mining, a depression-cone will be gradually formed in the scope of the impact around the mining area. As the mining continued, groundwater depression-cone will also continues to expand, drawdown continues to deepen, the coal measures aquifer and overlying aquifer will be drained, resulting in a greater impact on the groundwater system.2. After Daheng coal mine works5years, depression-cone will be expanded, the water level drawdown of the funnel center will be about13m, influence area will be about3.2km2.After14.4years of mining, the influence area will be about5.6km2.After28.8years of mining, the influence area will be about9.5km2.3. According to the simulation results and the aquifer thickness, the upper part of the quaternary of central field target aquifer will also have corresponding damage, even communicate with surface water and result in surface water as a supply of mine drainage directly.4. Based on solute transport studies of industrial sites and gangue field, Simulation result shows that contamination halois expandingover time, halo center with the water pollution downstream migration, and gradually increase the scope of pollution. Industrial sites and the gangue field under accident conditions, will be along the river valley into the Wanghuolang River, and along with the river downstream migration farther in the rainy season.