METHOD OF DETERMINING STRESS IN ROCK MASS Russian patent published in 2015 - IPC E21C39/00 

FIELD: mining operations.

SUBSTANCE: invention relates to mining operations and can be used to determine the stresses in the rock mass. The method in which the samples are recovered from the mass in the direction coinciding with the direction of the maximum main stress present in it. They are exposed to volumetric heating from 20 to 570°C, then they are left for cooling to a temperature of 140-150°C, the activity of acoustic emission is recorded simultaneously. The ratio of the amplitudes enveloping the acoustic emission activity is determined, occurring during cooling and heating, according to which the reaching by the stress at the test sites of the mass of the load level is determined, equal to or greater than 0.9 times the compressive strength of the rock, representing the transition of the latter to the stage of pre-destruction.

EFFECT: determining the fact of exceeding by the value of the maximum main stress of the critical level equal to or greater than 0,9 times the compressive strength σ_com that indicates the transition of the rock to the stage of pre-destruction.

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