METHOD FOR CONTROLLING STRESS-STRAIN STATE OF ROCK MASSIF Russian patent published in 2017 - IPC E21C39/00 

FIELD: mining engineering.

SUBSTANCE: invention relates to mining engineering and is intended to control the stress-strain state (SSS) of the rock mass, including those having a block structure, and can be used to estimate and forecast the stability of mine workings in the manufacture of mining operations. The way in which the controlled area on the well is being drilled from underground mines in the contour direction of working space. A bleeding core shall be selected, the analysis of which determines the size, location of the natural units in the rock mass and the boundaries between them. One shall carry out the test of bleeding core selected for each type of rock at the borehole depth and determine the value of the maximum allowable elastic deformation of this type of rock. One shall mount benchmarks along the longitudinal axis of the well within the natural blocks. Benchmarks mount places shall be selected in proximity to the boundaries of the natural blocks, and in the absence of the latter - after a certain interval of the well depth. The far benchmark shall be fixed near the contour of the working space. One shall measure the value of displacements between adjacent benchmarks along the longitudinal axis of the well. In addition, one shall measure the values ​​of the displacement of each benchmark along the longitudinal axis of the well relative to the conductor, which is used in calculating the value of deformation of the rock mass, being rigidly fixed to the wellhead, for which each of the benchmarks is equipped with an autonomous flexible coupling, such as stainless steel string, one end of which is fixed on a benchmark and the other end is brought out from the measuring unit mounted on the conductor and is connected to a tensioning device for continuous tensioning of flexible connection with the tensioning device is movable along it. After measuring the displacements, it is the basis for calculation the value of deformation of rock massif and deformations - for the parameters of elastic or inelastic deformations, which are to evaluate SSS rock massif changes at the controlled area. Moreover, the parameters of elastic or inelastic deformations of natural blocks of rock massif shall be determined by comparing the obtained values of deformations of the rock massif to the maximum allowable size of the elastic deformation of this type of rock. Then one shall fix their localization zones, define the parameters of these zones. A beginning of the active phase of rock deformation in zone of inelastic deformation and its duration, up to the collapse of a near circuit massif into worked space, shall be set on those benchmarks on which one records values of the displacement with respect to the conductor with continuous speed. The value of maximum allowable displacements of benchmarks at which there is a collapse of near circuit massif shall be determined when the flexible connection failure of any of the benchmarks, and it is used to forecast future collapses of adjacent roks to the waste space in the subsequent monitoring of SSS on working benchmarks.

EFFECT: invention provides increased positioning accuracy of localization of deformation zones.

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