Plastic Flow Modeling in Rock Fracture

short faces. Therefore, special requirements are applied to the modelling of rock destruction processes. The results should show the
possibilities of improving the strength of the tool, as well as the processes that occur under pressure on the rock. The specifics of solids
fracturing by a tool are described. These processes are accompanied by the formation of a plastic wedge and a thin, curved body between
surfaces of a cleaved element and destructed rock. The surfaces of dislodged elements have alternating rough and smooth areas. Such zones
are formed by low-frequency acoustic radiation, which can be observed during fracturing of rock cores by a punch and optically active,
organic glass with a controlled speed of crack motion. The fracturing direction is predicted along paths of principal stresses and can have
poorly predictable areas in zones of isoclines convergence leading to the intersection of surfaces. The element models that extend the
capabilities of research, taking into account a plastic flow of rock and drilling tool for boreholes, were developed. In these studies, there can
be taken into account various factors: the structure of the rocks in the face and the scheme of their collapse behind the face, the depth of the
work. This is especially important for lavas and short faces. The use of 2-3 research methods (destruction of rock samples and other solid
materials, studying stress-strain state (SSS) by optical and finite element modelling) is a prerequisite for obtaining accurate results.