Permeability inversion of hydrogeologic data under full-decay induced polarization constraints

With the development of underground engineering, the geological circumstances facing tunnel construction are becoming increasingly complex. It is easy to cause geological disasters such as water and mud inrush during the construction of tunnel. As a result, detection distribution of permeability in front of the tunnel is required. Accordingly, a permeability inversion method of hydrogeologic data under full-decay induced polarization constraints is proposed herein for tunnel construction. In order to solve the problem induced polarization relaxation time tomography, full-decay induced polarization multi-parameter tomography method are proposed. The intrinsic relationship between the induced polarization relaxation time and the permeability is used further. The relaxation time is added to the hydrogeologic inversion equation as a priori information. The method was applied in a railway tunnel in southwest China, and the high permeability area in front of the tunnel is predicted successfully, these outcomes verified the effectiveness of the method.