Simulation Experiment Research Of Chloridion Migration Characteristics In The Slope

The soil is a very complex and open system.With the development of the global economy and the improvement of production and living standards,more and more substances enter the soil through a variety of ways,which makes the soil environment seriously threatened.In recent years,the environmental problem of mining has become more and more popular,and the soil pollution in the slope of the mine has become a serious problem that needs to be solved urgently.The slope of mining land is a natural artificial complex system,the pollutants are transferred through various functions in the soil of the slope under rainfall condition,which lead to regional pollution.Therefore,the study on characteristics of the soil solute migration in the slope of mining under rainfall condition is of great significance to prediction,control and repair of the soil pollution.The following work was carried out in this study:(1)The basic physical properties of soil were determined,and the soil saturation permeability coefficient was determined by the determination of water head method.The soil water characteristic curve was determined by the tensiometer method,and the soil water characteristic curve was simulated by V-G model,and the permeability coefficient and diffusivity of unsaturated soil were obtained.The dispersion degree of soil was determined by the penetration curve method.(2)The Cl-migration experiment which in the slope under rainfall condition was carried out through the indoor slope model.Experiments were conducted by setting different rainfall conditions,solute release positions and slope types,the water content and Cl-concentration were monitored and sampled continuously.(3)Combining the indoor test conditions,the mathematical model of water and solute migration was established.The numerical simulation are carried out by Feflow software.Based on the numerical simulation results,the influence of different factors on solute transport was analyzed.The results show that with the increase of rainfall intensity and total rainfall,the range of soil unsaturated zone is enlarged,and the solute is also brought to the deep soil layer with the movement of water.It shows that the infiltration effect of rainfall has influence on solute transport.The different positions of solute release and slope angle will also have influence on solute transport.