| Popis: |
The article deals with the description of the deformation regularities and the conditions for the transition of stable, quasi-static destruction of specific areas of the rock massif under its loading into the unstable one and catastrophic. The decisive role at this process is played by the array loading mode: “soft” or “hard” determined by the spatial distribution of the deformation parameters in the rock massif. Such a change in the nature of the destruction is possible only if the massifs contain areas with deformation characteristics having a falling branch of stress-strain deformation curve. An example of building such solution for loading of a separation pillar under the development of a reservoir is given. An analytical solution was written out and the parameters of such a transition were determined. An important role is played by the dimensions ratio of the pillar and the span of the exposed roof. The latter, as mining works develops, gradually increases, which provides additional loading on the pillar. When the loading threshold value is reached, the solution of the corresponding geomechanical problem ceases to exist. This can be interpreted as a transition of the quasistatic process of destruction into the dynamic phase. |
