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

<div>Sketch of two types of configurations. (a) A-M configuration. Electrode A is placed on the tunnel face while electrode M is placed in the borehole. (b) AM configuration. Both electrodes A and M are placed in the borehole.</div>

Geofluids

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Figure 2

Figure 2: Study of Tunnel-Face to Borehole ERI (TBERI) Measurement Configurations and Its Optimization 