Expectation of rapid change of ground in tunnel boring machine is difficult
because tunnel face is not revealed. Probe drilling, tunnel seismic prediction (TSP), and
tunnel electrical resistivity prospecting system (TEPS) are widely used TBM ahead
prediction method. TEPS takes shortest time among these methods and has no
influence on ground. In this study, disc cutter of TBM is utilized as sensor of TEPS and
experimental test for checking influence of disc cutter spacing and contact area
between disc cutter and ground.