geoelectrical advance exploration method for mechanical and conventional tunnel - and void-headings and measuring device for this purpose,

摘要

geoelectrical advance exploration method for mechanical and conventional tunnel - and void-headings for the continuous detection of a specific rock resistor different pitch in advance before field within of a series of peaks during the control by means of local, characterized in that a geoelektrikapparatur (2) a screen current (i1) via a first the outside ring electrode (a1) and a central flow (i0) via at least one coil to the first the outside ring electrode (a1), which is in the form of internal electrode (a0) feeds into the rock, through the screen current (i1) a constant zero potential circle line (0) between the first the outside ring electrode (a1) and the inner electrode (a0) is formed, at least one to the first the outside ring electrode (a1) and internal electrode (a0) current, with the geo - electrical apparatus (2), which is connected to the first counter pole - electrode (b0) in a relatively large distance to the same in the rock is arranged, and the geoelektrikapparatur (2) for calculating an apparent resistance rock state (rho - s) the thickness of the centrally current (i0) at a constant voltage (u0) or a voltage (u (0)) in the case of a constant central flow (i0) between the inner electrode (a0) and the opposite pole - electrode (b0) measures.