METHOD FOR ELECTRICAL TOMOGRAPHY OF A CARBONACEOUS SEAM Russian patent published in 2021 - IPC E21C39/00 

FIELD: mining industry.

SUBSTANCE: invention relates to the mining industry and, in particular, to methods for detecting geological disturbances in a carbonacious massif of potentially dangerous zones by dynamic phenomena, the forecast of emission-hazardous zones. The method includes placing the electrodes of a four-electrode installation in the workings outlining the studied area, exciting an electric field through current electrodes A and B, measuring its magnitude through measuring electrodes. Moreover, the electrodes of the feeding dipole AB are placed in one roadway entry, the electrodes of the receiving dipole MN in another roadway entry, while the electrodes A and M are placed in the roof of the formation, the electrodes B and N in the soil of the formation. The feeding and receiving dipoles are arranged in such a way that the conditional line drawn between their ends is at an angle to the direction of the roadway entry, which is the probing angle, the angle is set conditionally and retained when moving the dipoles within the extraction pillar, voltage drop on the feeding and receiving electrodes is determined in each position of the dipoles, according to which a Radon image is constructed for a given probing angle. Then these operations are repeated at different values of the probing angle to obtain other Radon images, according to which the absorption function of the electric field by the carbonaceous array is determined by the two-dimensional filtration method according to the formula , where : , is the potential difference, μ is the absorption coefficient or linear attenuation coefficient, dt is the increment: the differential of the t coordinate in the ost coordinate system rotated by an angle, and using the obtained electric field absorption function, a tomographic model of the studied area is constructed, on which the areas of electric field absorption are determined, according to which the places of possible emission zones, geological disturbances are identified, the boundaries of zones and geological disturbances in the studied area are determined.

EFFECT: increase in the accuracy of determining the internal structure of the coal-bearing massif, the coal seam of the investigated area (block) in a two-dimensional coordinate system.

1 cl, 3 dwg