Axisymmetric flow for water and contaminant in clay shale

The swelling of clay shale is an important problem in many fields, such as road, slope and underground structure. The flow of water and contaminant and swelling in clay shale are governed by the equilibrium equation, Darcy law, mass balance equation, which are coupled and complex. A problem of axisymmetric flow in clay shale is considered, and a Finite Difference Method is used to solve the basic equations under special boundary condition. The distribution of pore pressure, solute concentration and stresses around borehole are obtained. The results may be applied to analyze the stability of borehole or tunnel.