METHOD OF STUDY OF STRESSED STATE OF ROCKS MASS Russian patent published in 2015 - IPC E21C39/00 

FIELD: instrumentation.

SUBSTANCE: invention relates to mining and is intended to determine direction of maximum stress in structural elements of the development systems relatively to the drilled test wells. Method includes installation in the vertical well of the rod acoustic line, on which rigidly the contacting with well walls ring is installed, and registration of the acoustic emission (AE) at the acoustic line end projecting from the well. In mass in same horizontal plane with the test well and parallel to it additionally at least three wells are drilled, in each well the acoustic line with ring similar to the located in the first well are installed. All rings are made out of lamellar composite material with anisotropic structure in the ring plane, and orientation angle of the ring layers in each next well is increased by 15° relatively to the previous. As per AE signals registered at each acoustic line the corresponding relationships of total count vs. Time are determined, the acoustic line with total count of AE drop with time is determined. According to the direction of layers in the ring in this acoustic line the direction of maximum stress occurred in the mass in plane of the orthogonal axis of the measuring well is determined.

EFFECT: assurance of the possibility of determination of the maximum stress acting orthogonally to the measuring well.

2 dwg