Pollutant Dispersion Induced By Vibration From Metro Trains

The resource of groundwater is the matter without that we can't produce and live. We often use this nature resource in everyday's life. But with the heightening of our life level the growing of the industry and agriculture, the situation of the groundwater pollution is more serious increasingly. At the meanwhile, the railway building is developing rapidly, especially the subway is. When the train is moving, there may be the groundwater pollution problem. And the place the train passed through may have been polluted. In that case, it is significative that the research which is about hydrodynamic dispersion with the effect of metro trains vibration.The transport ways of solute in the porous media mainly include convection and dispersion. The dispersion is due to the structure of the porous media. Here, on the basis of the theory about solute transport in porous media, coupled with the model of pore water pressure with the effect of train vibration, according to the conservation of mass, a convection-dispersion equation for hydrodynamic dispersion with the effect of vibration from metro trains is deduced complying with some fundamental theories. This model is solved by finite difference, with programming corresponding program.The saturated sand stratum is regarded as two-phase media and others are regarded as single-phase media. And the source of pollute is a point. With single trail passing and some trains passing, the distribution of pollutant is simulated, and some preliminary conclusions are got.