CONTROL OVER LOCAL ROCK SPECIMEN DENSITY VARIATION AT STRAINING Russian patent published in 2014 - IPC G01N1/08 

FIELD: mining.

SUBSTANCE: first, selected are directions for elastic wave propagation directions uniformly distributed over the entire volume of specimen to measure propagation speed and to define the length of every direction. Ultrasound pulses excited in specimen are radiated therein at the start of every direction. Elastic wave travel time is defined for every direction to define the means propagation speed in every direction using obtained elastic wave length and travel time. Then, said specimen is deformed to preset magnitude in stepwise manner, via preset time intervals. At every deformation step, said mean propagation speeds are defined for every directed as described above to define mean propagation speeds for separated part of specimen volume by the method of nuclear Gaussian functions with averaging radius of at least 5 mm. Calculations at every deformation step are displayed as the projection of the specimen vertical section with at least 5 mm deep layer with dyeing of projection sections by different colours proportional with calculated speed difference for said sections between current and previous deformation steps to make conclusion of specimen density variation.

EFFECT: higher-quality and more detailed picture of compaction and destruction zones.

4 cl, 4 dwg