The Numerical Simulation Of The Mining Groundwater Environmental Impact Study

The influence of mining on the groundwater is a dynamic and ongoing process,such as coal mine triggered by mining drainage, aquifer unwatering, mining damage and other factors,has broken the original groundwater, diameter, line balance, changed the mining area of groundwater circulation relationship, make the groundwater system has become increasingly complex.The influence of metal mine underground mining of groundwater mainly through the thin line of groundwater resources,the formation of regional groundwater descent funnel, drainage of groundwater resources.In order to guarantee the coordinated development of economy and ecology, the mine before the formal mining groundwater environment impact assessment must be conducted,should be from the perspective of groundwater environmental impact, environmental feasibility of the construction. Ground water numerical simulation technology is an effective method for mine groundwater environment impact assessment, a iron ore in zhaoqing city, guangdong province, this study based on hydrogeological survey data, combined with field survey to collect data, using numerical simulation technology of groundwater, groundwater flow numerical model is set up, to predict the groundwater impact of mining drainage, for mine production and construction and to provide scientific decision basis of groundwater protection.In this paper, a iron ore mine in zhaoqing city surrounding hydrogeological investigation, water level monitoring, groundwater quality sampling, the hydrogeological test, on the basis of deep analysis of the hydrogeological conditions of study area, considering the possibility of a mine drainage during construction and operation, through the adoption of the "big well method" to predict the mine mining middle formed different mining of mine water inflow, Visual Modflow groundwater numerical simulation software is adopted to establish the loose bed, bedrock layer structure of groundwater flow numerical model, through the observation data of underground water level and fitting, adjust the hydrogeological parameter identification model.Using the numerical model, forecasting mine discharge of mine water after regional underground water level change trend, it is concluded that the mine will adopt, will form the main shaft for landing funnel area of the center of the circle radius of 758.9m.