FORECAST OF ROCK MASSIF SECTION COLLAPSE Russian patent published in 2014 - IPC E21C39/00 

FIELD: mining.

SUBSTANCE: this process comprises registration in time of electromagnetic radiation (EMR) signals. Spectral amplitudes of said signals are measured to construct the spectrum-time matrix of said amplitudes as frequency and time increase. Frequency subbands are defined as frequency increases to isolate near spectral amplitudes in every subband. Three groups of spectral amplitudes increasing in time are designated by open lines on matrix. On matrix in every said group examined are the expansion in time of frequency subbands and areas of every group to judge on collapse process build-up. At a time with isolation of said groups, consecutively registered in time are every i^th time of difference between maximum and minimum magnitudes of EMR signal spectral near amplitudes, ratio between said differences, difference between said ratios and quantity of spectral characteristics in every group and at every time moment. Decrease in said ratios and their differences, their subsequent stabilisation in time and increase in quantity of said amplitudes in third group allow the conclusion about the origination of intensive fracturing.

EFFECT: extra data on massif state, detailed collapse process.

2 dwg