METHOD TO DETERMINE VARIATION OF STRESSED CONDITION OF ROCK MASSIF Russian patent published in 2013 - IPC E21C39/00 

FIELD: mining.

SUBSTANCE: method includes installation of a cylindrical acoustic line in a well, reception and analysis of parameters of ultrasonic signals that spread in it. Previously on the acoustic line coaxially with it and at a certain distance from each other, at least two textolite rings are fixed, the inner diameter of which matches the diameter of the acoustic line, and the outer one - the well diameter. Each of them is exposed to individual level of mechanical loading in identical direction matching the diameter. At the same time the acoustic line is placed in the well so that this direction matches the direction of maximum primary stress in the massif. Variation of stressed condition is seen by spasmodic increase of growth steepness of total count of ultrasonic signals of acoustic emission arising in textolite rings received from the acoustic line.

EFFECT: provision of high sensitivity and production of quantitative estimates when determining variation of stressed condition of rock massif.

2 dwg