The Research Of Heavy Metals Migration Simulation Under The Tailing Geotechnical Seepage And Pollution Control

Abstract:Since reform and opening up, especially in the new century, China’s industrialization and urbanization were speeding up, serious environmental pollution was caused by the extensive mode of economic development, include which of the ecological environment and people’s health were threaten by the heavy metal pollution. As mining pollution incidents frequently happened in recent years, the tailings has been a common potential energy pollution sources. Excess emission, accidentally release and mismanagement would cause pollution around the area of groundwater and surface water. So the analysis of heavy metal pollutant migration of tailing was of great significance to the environmental protection engineering.In this paper, a metal tailings was made as the research background, combined with the environmental monitoring data, the method of numerical simulation and theoretical analysis were used in the study of tailing migration of heavy metals, the study was mainly for the following:(1) Made a research summary in terms of test and simulation and prevention. The summary was about heavy metal migration of tailings,which were done by the scholars at home and abroad. Made a system survey of a tailing which was regarded as the engineering background by this article.(2) Against the background of a tailings, a heavy metal migration simulation and forecast analysis were established. A two-dimensional numerical migration model of tailings contaminants was established based on the percolation theory, the finite element method was used to solve the model. Coupled with the solute transport sub-model, the seepage results was used to calculate as the parent model. The results show that, the contaminants exposed beyond the slope begins to impact on the surrounding environment when the migration of heavy metal contaminant model is calculated under seepage by2750days, the migration paths of the contaminant are concluded under the seepage. Then the results of the analysis was compared with the environmental monitoring data of the mine area, within a certain error range, the simulation conclusion were reliable.(3) To explore the influence of the mine tailings on the surrounding ecological environment, the Two-dimensional point source flux continuous injection of pollutant migration solution was used to predict the pollution of main drainage system and reservoir district. The results show that the compute result of these two areas were conforms to the Ⅲ class of the National environmental quality standards for surface water, which would not ecological impact the downstream of the reservoir area.(4) Analytic relations function ways of Fredlund was used to describe the relationship between the coefficient permeability and matric suction, through which to improve the permeability coefficient to be a function. Heavy metal migration process under the seepage conditions was explored in this article. Compare the migration status before and after improvement of modified migration model, the improvement method was closer to engineering practice and the field monitoring data. And then discussed the regular of dispersion degree that influence on the contaminant migration.(5) On the basis of numerical calculation analysis, different initial concentration and different migration paths of heavy metal pollutants diffusion were used in this paper, after compares and analyzes the status of the migration, put forward the key point of heavy metal pollutant. At the degree of the earth’s physical chemistry, ecological environment and other interdisciplinary analyzed the pollutant diffusion mechanism, and from the metal recycling re-election, filling, acidic water and biochemistry to analysis of the governance of pollutant diffusion. At the end of this article, on the basis of environmental problems of background mine, suitable comprehensive control measures were put forward, which provided a theoretical insist for the safety management.