DOWNHOLE METHOD FOR DETERMINATION OF DIRECTION AND MAIN STRESS VALUES

FIELD: mining.SUBSTANCE: invention relates to mining and can be used for determining the direction of action and values of primary stresses in rock mass, evaluation of stress-strain state of mine rock massif, detection of location zones of rock damage and nature of their propagation in underground mining of mineral deposits. Method involves drilling of wells or boreholes in underground mine workings with length from 5 m, with diameter from 40 mm. On internal surface of wells marks are applied in the form of circle with marker or paint. Position of the video endoscope camera relative to horizon is determined, direction of deformation of horizontal and inclined wells, shifts and orientation of cracks are determined with video endoscope in examined wells. Obtained images efficiently determine minimum diameter of the well, the direction of which corresponds to the direction of maximum stresses in rock massif. At the specified parameters are determined images circuits d, d, the direction of maximum compression well indicates the direction of action of maximum stresses σFollowing values are determined: angle α between the vertical and the direction of maximum stresses, angle β between image vertical and the direction of action of maximum stresses, thrust slip ΔH.Graphic image of the analyzed sections is plotted with tracing of, for example, site deformation or slip scheme. Well deformation is determined depending on d- initial well diameter, d- minimum diameter of the well under deformation and K- empirical coefficient taking into account physical and mechanical properties of rocks and structural forest renewal changing massif in direction of maximum stress.EFFECT: technical result consists in improvement of accuracy of determination of the direction of main stresses, enhancing security and efficiency of field development.1 cl, 3 dwg Изобретение относится к горному делу и может быть использовано для определения направления действия и значений главных напряжений в горном массиве, оценки напряженно-деформированного состояния массива горных пород, выявления местоположения зон повреждения пород и характера их распространения при подземной разработке месторождений полезных ископаемых. Технический результат заключается в повышении точности определения направления главных напряжений, обеспечении безопасности и эффективности освоения месторождения. Способ включает бурение скважин или шпуров в подземных горных выработках длиной от 5 м, диаметром от 40 мм. На внутреннюю п