Study of Tunnel-Face to Borehole ERI (TBERI) Measurement Configurations and Its Optimization

Figure 1

Sketch of TBERI electrode arrangement. (a) The three-dimensional overall diagram. (b) Electrode arrangement on the tunnel face. The electrodes arranged in rows as much as possible to cover the tunnel face. Totally 45 electrodes are placed in this case. (c) Electrode arrangement in the borehole. Generally, the electrodes in the borehole are arranged at equal intervals. Totally 30 electrodes are placed in this case.