EP 1114336 A2 20010711 - GEOELECTRIC PRE-PROSPECTING METHOD
Title (en)
GEOELECTRIC PRE-PROSPECTING METHOD
Title (de)
GEOELEKTRISCHES VORAUSERKUNDUNGSVERFAHREN
Title (fr)
PROCEDE GEOELECTRIQUE DE RECONNAISSANCE PREALABLE
Publication
Application
Priority
- DE 9902981 W 19990918
- DE 19842975 A 19980919
Abstract (en)
[origin: WO0017489A2] The aim of the invention is to carry out a geoelectric pre-prospecting method for mechanical and conventional tunnel and cavity advance headings for continuously detecting a specific rock resistance distribution in an advance heading forefield inside a rock formation during through positioning thereof. To this end, a geoelectric apparatus (9) feeds a screen current (I1) into the rock formation via an outer ring electrode (A1) and feeds a measured current (I0) via at least one inner electrode (A0) configured such that it is homopolar to the outer electrode (A1). The screen current constructs a constant zero-potential circular curve (0) between the outer ring electrode (A1) and the inner electrode (A0). At least one current electrode (B0) which has a polarity opposite the outer ring electrode (A1) and inner electrode (A0) and which is connected to the geoelectric apparatus (9) is arranged at a relatively large distance from the same in the rock formation. The geoelectric apparatus (9) measures the intensity of the measured current (I0) in order to calculate an apparent rock resistance (rho-s) and simultaneously calculates a voltage (U0) between the inner electrode (A0) and the current electrode (B0).
IPC 1-7
IPC 8 full level
E21C 39/00 (2006.01); G01V 3/24 (2006.01)
CPC (source: EP)
E21C 39/00 (2013.01); G01V 3/24 (2013.01)
Citation (search report)
See references of WO 0017489A2
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0017489 A2 20000330; WO 0017489 A3 20000817; AU 1260600 A 20000410; DE 19842975 A1 20000427; DE 19842975 B4 20040129; EP 1114336 A2 20010711
DOCDB simple family (application)
DE 9902981 W 19990918; AU 1260600 A 19990918; DE 19842975 A 19980919; EP 99955730 A 19990918