space of a full face excavated tunnel is fully used a controller controls doors of a source and measuring electrode compartment and a shielding electrode compartment to open and controls a corresponding hydraulic delivery device to automatically and quickly arrange a source electrode system a measuring electrode system and a shielding electrode system under the action of a shielding current system tomography detection supply current is directed ahead of the working face three dimensional geologic information can be obtained and the relationship between an induced polarization half decay time difference and a water quantity can be used to quantitatively forecast the water quantity of a water bearing body and meanwhile the half decay time difference parameter has a high capacity of distinguishing free water from bound water application_number US 201314235307 A description the present invention is further illustrated below by virtue of specific embodiments and drawings all the work in the present invention is realized in the master control room 9 of the tbm an arrangement process for the power supply and measurement electrode system of the tunneling working face of the tbm is introduced first as shown in fig1 and fig2 when the tbm main body 4 tunnels forwards the controller 6 controls the compartment doors of the left compartment.