FIELD: mining.
SUBSTANCE: group of inventions can be used to assess stressed condition of rocks in a rock massif and different structures, such as dams. Method includes installing a device for implementing said method in a rock mass through a well. Method includes determination in a given plane stress values in three directions, oriented at an angle of 120° relative to each other, based on which distribution of stresses is determined in a given plane and stress condition of rocks is assessed. Method includes, in rock mass through well, creating a spherical cavity, which is filled with a solution which solidifies and expands during solidification. Device for implementing method is installed in centre of spherical cavity. Stress distribution is determined in two more planes, which together with first plane form three orthogonal planes passing through centre of spherical cavity. Stress distribution is then presented on orthogonal planes in form of ellipses, on which, as in three projections on orthogonal plane, an ellipsoid is constructed. Further, stress condition of rocks is evaluated based on orientations and numerical values of semi-axes of ellipsoid. Device has a measurement system with force sensors and a recorder. Measuring system is in form of a sphere with radial holes arranged in orthogonal planes passing through centre of sphere. Radial holes are located at an angle of 120° relative to each other in each of said planes. Rods are inserted into said holes. Force sensors are installed between rods and bottom of said holes.
EFFECT: control from one point of spatial stress distribution, easier operation and simplified design of device.
8 cl, 3 dwg
