The Research Of Groundwater Pollution Prediction And Prevention After Haizhou Open-pit Mine Closed

The mechanisms and tectonic evolution in basin were analyzed from the characteristics of the faultage, joints and drape in view of the geological mechanics, drawing that the fault all experienced multistage activities in the process of evolution of Fuxin basin, and that the Basin underwent eight stages from birth and development to return. In the process of evolution of Fuxin basin, the alternation of vertical different environments was due to the paleoclimate, the paleostructure and the change of position which caused great changes in paleogeographic environment. Analyzing the twelve stage of development composed of sedimentary basins from the tectonic evolution and sedimentary environment, each stage of development had its own unique sedimentary environment configuration. Based on the analysis of sedimentary stratigraphical unit constitute, the paleogeographic environment and the process of evolution of Fuxin basin of each stage were recovered and reconstructed , and then the characteristics of water was analyzed, groundwater geological model was established. Using groundwater dynamics, Porous medium fluid mechanics, environmental chemistry and Hydrological geology, etc. which are multidisciplinary related theory, the occurrence and flow model of mining groundwater in Fuxin basin was deduced, the common saturated flow mathematical model of groundwater movement and pollutant migration of dispersion equation were analyzed,and the groundwater multi-equilibrium model and the solute transport model were established. Through the investigation and analysis for the chemical components of the groundwater in Fuxin basin, the water quality for Mine water and Water-interception roadways was monitored and evaluaed, and the main pollutants are SO42-,Cl-,Fe3+,Cr6+. By means of the inside and outside experiments, the parameters and regularity of the migration of pollutants in the groundwater were obtained, using 3D simulation software in groundwater flow and solute transport—Visual MODFLOW for the numerical simulation on the pollution of groundwater in fuxin basin after haizhou open-pit coal mine pit, the migration regularity of the pollutant was found and some corresponding preventive measures were put forward.