The Numerical Simulation Research On The Impact Of Groundwater Resources By Sanbaizi Coal Mining Co.,Ltd

Shanxi province implements reorganization to small coal mines around for the purpose of meeting the requirements of the national economy, improving the manufacturing level of the coal industry in Shanxi. With the increase of manufacturing output scale, the impact of coal mining on groundwater is also growing,Meanwhile, hydro geological problems also become more serious. Sanbaizi Coal Co.,Ltd is located in Ningwu County, Xinzhou, Shanxi. As the groundwater is the main source of the drinking water for the residents nearby, the hydro geological problem which is caused by coal mining will certainly influencethequality of drinking water and everyday routines. Based on the research background of Shanxi Coal Transportation and Sales Group Sanbaizi Coal Co.,Ltd, the article analyzes the impact of coal mining on groundwater quantity and quality through on-site field surveys and hydro geological data collection. Firstly, simulates the impact of groundwater level in the mining period by Visual Modflowto determine the scope of the Sanbaizi coal mining impacts on groundwater quantity. Second, simulates the impact of industrial sites and gangue field on groundwater by Visual Modflow to determine the scope and extentof the impact of water quality, and to analyze the impact of coal mining on the drinking water quality nearby, which provides a scientific basis for regional drinking water safety.Simulated result shows as follows:1. When the No.2and No.5coal bed are mined completely, the maximum height of water flowing fractured zone set up under the Permian Shanxi fractured sandstone aquifer. Water flowing fractured zone would be a direct conductionin the overlying Permian Shanxi coal fractured sandstone aquifer system and Carboniferous Taiyuan sandstone aquifer. Coal mining will affect the two aquifers.2. Groundwater numerical model is established by Visual Modflow software to identify, validate, and simulate forecasts. The result shows that aftercoal mining2.49a, A groundwater precipitation in the mining area is formated as the center of the funnel, the water level drawdown is around20m at the funnel center, up and downstream drawdown became smaller, the impact area is approximately8km2. After10a for the region’s mining,A bigger groundwater precipitation in the mining area is continously formated as the center of the funnel, the water level drawdown funnel centered around25m, up and downstream drawdown became smaller, the impact area was approximately19km2. After24.63afor the region’s mining,A bigger groundwater precipitation in the mining area is continously formated as the center of the funnel, the water level drawdown funnel centered around35m, up and downstream drawdown became smaller, the impact area was approximately29km2. There’s certain impact on the drinking water sources of residents nearby, and the shallow Quaternary wells is mainly affected.3.Based on solute transport studies of industrial sites and gangue field, the loose Quaternary aquifer pore solute transport simulation project area is identified as target aquifer. Groundwater numerical model which is established based on the numerical model of the flowis established by Visual Modflow software to identify, validate, simulate forecasts,predicting industrial sites in the COD and SO42-ions, respectively, as simulated factor sewage treatment station and mine water treatment stations. Analog simulation and transport.prediction factor in the field of the gangue is SO42-ions.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, have an impact on the downstream shallow groundwater.