METHOD OF STRESS CALCULATION IN MINE ROCK MASS Russian patent published in 2008 - IPC E21C39/00 

FIELD: mining engineering.

SUBSTANCE: method of stress calculation in a mine rock mass. The method of stress calculation in a mine rock mass involves extraction of a series of samples from the rock mass in the direction coinciding with the one of the effect of the main maximum stress in the mass. A test mechanical loading of each sample, measurement of the acoustic emission activity in the course of the loading and a loading value that makes the specified activity rise in discrete steps. The loading is performed in a mode of a triaxial axiosymmentrical proportional compression at a constant but different for each sample ratio of the axial and lateral stress. It is the sample with a maximum steepness of the rapid rise in the acoustic emission activity and the minimum acoustic emission activity value before this rise that is selected from the sample series. The values of the axial and lateral stress tested by the specified sample at a test loading are taken for corresponding main stresses in the rock mass.

EFFECT: enhanced accuracy and reliability of a qualitative assessment of the main stress values effective in the rock mass.

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